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Health Calculators

Estimate macros, track progress, and plan routines with calculators built for everyday wellness — from fitness benchmarks to nutrition and recovery.

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Explore 109 Health calculators

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A1C to Average Glucose Converter | HbA1c eAG Calculator

Convert HbA1c to estimated average glucose, or average glucose back to A1C, using the ADAG relationship. Learn how to read the result and when it can mislead.

A1C to Average Glucose Converter | HbA1c eAG Calculator health calculator 1 mmol ADAG CGM

Absolute Neutrophil Count Calculator | ANC Formula, Ranges, and Infection Risk Guide

Calculate absolute neutrophil count (ANC) from a CBC differential, review the ANC formula, understand normal and low ranges, and learn how to interpret infection-risk categories.

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ACFT Score Calculator: Six-Event Army Fitness Estimate

Estimate an Army Combat Fitness Test (ACFT) score from deadlift, power throw, push-ups, sprint-drag-carry, plank, and two-mile run results, including event points and a 60-point-per-event pass check.

ACFT calculator Army combat fitness test score military fitness 0–59 seconds 1110 seconds

Adult Blood Volume Calculator Using the Nadler Formula

Calculate an adult's estimated circulating blood volume in liters and milliliters with the sex-specific Nadler formula using height in cm and weight in kg.

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Adult eGFR Calculator Using the 2021 CKD-EPI Creatinine Equation

Estimate adult kidney filtration (eGFR) with the 2021 CKD-EPI race-free creatinine equation using age, serum creatinine, and sex; educational use only.

eGFR calculator kidney function estimator CKD-EPI 1.73 m² for at least three months CKD

Antidepressant Taper Schedule Calculator – Linear and Proportional Planner

Compare linear and proportional antidepressant taper schedules using a current dose, goal dose, duration, and adjustment interval. Educational planning aid for discussion with a prescriber.

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Apnea Training Hold-Time Safety Margin Calculator

Estimate conservative breath-hold training limits from your personal best, experience level, apnea type, and supervision setting, with essential apnea safety reminders.

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Asbestos Fiber Exposure Calculator: OSHA 8-Hour TWA and Dose

Estimate an OSHA 8-hour asbestos TWA, the worst 30-minute excursion average and cumulative fiber-years from task concentrations and durations. Estimation aid only.

asbestos exposure calculator 8-hour TWA OSHA PEL 0.1 f/cc excursion limit fiber-years

ASCVD 10-Year Risk Estimate Calculator for Cholesterol, Blood Pressure, Smoking, and Diabetes

Estimate a simplified educational 10-year ASCVD risk from age, cholesterol, HDL, systolic blood pressure, smoking, and diabetes. This is not an official clinical score.

ASCVD risk calculator 10-year heart disease risk cardiovascular risk estimator ASCVD HDL

ASRS ADHD Score Calculator | Adult ADHD Self-Report Scale

Use the ASRS ADHD score calculator to total the six screening items, count frequent responses, and read the result as a conversation starter with a clinician.

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AUDIT Alcohol Use Disorder Score Calculator

Calculate your AUDIT alcohol use disorder score from the 10 WHO questions, screen your drinking risk level, and learn what the result means. Not a diagnosis.

AUDIT score calculator alcohol use disorder test drinking risk assessment AUDIT CAGE

Bacon Calories, Exercise Miles, and Weekly Cost Calculator

Estimate weekly bacon calories, the running miles needed to burn them, optional bacon spending, and the calculator's intake-level label.

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Badminton Court Setup Cost Calculator | Build-Out, Equipment, and Operating Budget

Estimate badminton court build-out costs, equipment purchases, staffing, and ongoing operating expenses for a club or tournament venue. Compare court surfaces, seating, and payback timing.

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Basic Reproduction Number (R0) Calculator for Epidemic Transmission

Calculate an epidemic basic reproduction number (R0) from daily potentially infectious contacts, transmission probability per contact, and infectious period.

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Benzene Exposure Risk Calculator - Estimate Daily Inhalation Dose

Estimate benzene inhalation dose and hazard quotient from air concentration, breathing rate, exposure time, and body weight.

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Blood Donation Eligibility Calculator (FDA and Red Cross Rules)

Check blood donation eligibility against FDA 21 CFR 630 and American Red Cross criteria: age, weight, hemoglobin, blood volume and 56, 112, 7 or 28-day intervals.

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Blood Sugar Converter (Glucose): mg/dL ↔ mmol/L

Convert glucose between mg/dL and mmol/L with accurate rounding. Includes formulas, worked examples, and a quick common conversions table.

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Blood Type Compatibility Calculator - ABO, Rh and Components

Check ABO and RhD transfusion compatibility for red cells, plasma and platelets, see which antibody would react, and learn why the plasma rule inverts the red-cell rule.

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Body Frame Size Calculator | Compare Height and Wrist Circumference

Compare height and wrist circumference to estimate a small, medium, or large body frame with male or female threshold sets, measurement tips, ratio guidance, and an optional mini-game.

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Body Surface Area Calculator: Mosteller and Du Bois BSA Estimates

Calculate body surface area (BSA) from height and weight with the Mosteller or Du Bois equation, in metric or imperial units, and estimate an optional mg/m² dose.

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Body Type Calculator – Estimate Your Somatotype Tendencies

Estimate your somatotype tendency from height, wrist circumference, shoulder shape, perceived weight-gain pattern, and natural build.

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Boxing Calories Burned Calculator: MET Estimate for Training Sessions

Estimate calories burned during boxing sessions—from bag work and pad drills to sparring and competition-style rounds—using METs, body weight, and duration.

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Caffeine Tapering Schedule Calculator | Day-by-Day Reduction Plan

Plan a gradual caffeine cut by entering your current intake, target intake, and taper length to generate a day-by-day schedule in milligrams.

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Cardiac Output Calculator - Estimate Heart Pumping Capacity

Determine cardiac output in liters per minute from heart rate and stroke volume, review worked examples, and explore related heart health calculators.

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CGM vs. Fingerstick Cost Comparison Calculator

Compare continuous glucose monitor costs with fingerstick testing costs over any horizon, including sensors, transmitters, receivers, strips, lancets, and meter replacement.

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Child Calorie Needs Calculator Using Pediatric EER Equations

Estimate daily calorie needs for children ages 2 to 18 using pediatric Estimated Energy Requirement equations, body size, sex and activity level.

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Circadian Light Exposure Planner | Melanopic Dose & Phase Balance

Compare morning and evening melanopic light doses in lux·min and estimate the direction and size of a simplified circadian phase shift.

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Contrast Agent Dosage Calculator for CT and Angiography | Estimate Iodinated Contrast Volume

Calculate iodinated contrast volume in milliliters from patient weight, iodine target in mg I/kg, and product concentration in mg I/mL for CT and angiography planning.

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Corrected Calcium Calculator (Albumin Adjustment) | Payne Formula

Calculate corrected calcium (mg/dL) from measured serum calcium and albumin with the Payne formula, plus worked examples, interpretation ranges, and limitations.

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Creatinine Clearance Calculator | Cockcroft-Gault CrCl Estimate

Estimate creatinine clearance with the Cockcroft-Gault equation to support renal drug-dosing decisions.

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CVSS Vulnerability Score Calculator - Evaluate Security Risks

Calculate the CVSS v3 base score for security vulnerabilities by selecting metrics like attack vector, complexity, and impact.

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Cycling Calorie Burn Calculator - Estimate Bike Ride Calories by Speed and Weight

Estimate calories burned on a bike ride using distance, ride time, average speed-based MET bands, and body weight in metric or imperial units.

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DASH Diet Sodium Planner | Meal-by-Meal Sodium Budget

Split a DASH daily sodium goal into meal-by-meal budgets, compare 1,500 mg and 2,300 mg targets, and use the result for label reading, recipe planning, and restaurant choices.

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Electric Toothbrush Head Replacement Planner | Estimate the Next Swap Date

Estimate when to replace an electric toothbrush head based on the last swap date, daily brushing frequency, and brushing pressure.

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Electric vs Manual Toothbrush Cost Calculator | Compare Long-Term Brush Spending

Compare long-term brushing costs for electric and manual toothbrushes by entering handle price, replacement-head cost, brush lifespan, and analysis period.

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Electric Wheelchair Charging Cost Calculator | Estimate Recharge Energy and Monthly Cost

Estimate how much it costs to recharge an electric wheelchair using battery voltage, amp-hours, charger efficiency, electricity rate, range per charge, and daily mileage.

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Elliptical Calorie Burn Calculator | RPM, Resistance, and Weight

Estimate elliptical workout calories from stride length, pedal RPM, resistance level, duration, and body weight, with calculated virtual speed and distance.

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Employee Turnover Rate Calculator (Voluntary + Involuntary)

Compute employee turnover rate the way BLS JOLTS and SHRM define it: separations divided by average headcount. Splits voluntary, involuntary and other exits.

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Ergonomic Desk Height Calculator | Sitting and Standing

Estimate an ergonomic sitting or standing desk height from your body height, shown in inches and centimeters, as a starting point for a comfortable workstation.

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Evening Screen Light Melatonin Suppression Calculator | Lux, Time & Filter

Model estimated evening melatonin suppression from screen illuminance in lux, viewing duration, and blue-light filter reduction with a transparent dose-response curve.

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Eyeglass Prescription Power Calculator | Sphere, Cylinder & Axis

Analyze a single-vision eyeglass prescription in minus-cylinder form. See equivalent sphere, the powers in the axis and perpendicular meridians, and the size of the astigmatism correction.

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Fallout Shelter Radiation Dose Calculator

Project cumulative radiation dose inside a shelter after nuclear fallout using initial intensity, protection factor, decay half-life, and stay duration.

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FIB-4 Score Calculator for Liver Fibrosis Risk | AST, ALT & Platelets

Use age, AST, ALT, and platelet count to calculate a FIB-4 score and place liver fibrosis screening risk in the age-adjusted range.

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Fluoride Intake Calculator for Water, Toothpaste, and Daily Sources

Use this fluoride intake calculator to estimate mg/day from drinking water, swallowed toothpaste, tea, supplements, and other common sources, then compare the total with age-based reference limits.

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Food Temperature Danger Zone Calculator - Estimate Safe Hold Time

Enter a food's internal temperature to estimate how long it can remain in the 40–140°F danger zone before refrigeration or reheating is needed.

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Formaldehyde Inhalation Dose & Hazard Quotient Calculator

Calculate inhaled formaldehyde dose from indoor-air concentration, breathing rate, exposure duration, and body weight, then view its hazard quotient.

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Greenhouse Ventilation Calculator | Size Fans by House Volume and ACH

Estimate greenhouse fan airflow from length, width, height, and air changes per hour so you can size exhaust fans, vents, and controls for crop conditions.

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Hand-Arm Vibration Exposure Calculator - Estimate A(8) from Multiple Tools

Estimate daily hand-arm vibration exposure A(8) from one or more tools, compare the result with common action and limit values, and see how trigger time and acceleration combine across a shift.

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Health Insurance Plan Comparison Calculator for Premiums, Deductibles, Copays, and Out-of-Pocket Costs

Compare up to three health insurance plans by estimated annual cost. This calculator combines premiums, deductibles, copays, coinsurance, prescriptions, surgery assumptions, and out-of-pocket maximums for HMO, PPO, EPO, and HDHP options.

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Heat Index and Humidity Comfort Calculator | Feels-Like Temperature

Calculate the heat index from air temperature and relative humidity, account for activity level, review heat-risk categories, and get practical hot-weather safety guidance.

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Herd Immunity Coverage Calculator: R0 and Vaccine Effectiveness

Estimate the vaccination coverage needed for a herd-immunity threshold using a basic reproduction number (R0) and vaccine effectiveness.

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HIIT Calorie Burn Calculator | Estimate Work and Recovery Interval Calories

Estimate calories burned in a HIIT workout by entering your body weight, interval count, work duration, recovery duration, and MET values for each phase.

HIIT calorie burn calculator interval training calories high intensity exercise energy MET calculator HIIT

Home Radon Fan Runtime & Steady-State Planner

Plan a home radon mitigation fan runtime, target-clearance estimate, and predicted steady-state radon level from space volume, fan airflow, infiltration, and radon entry rate.

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Ideal Body Weight Calculator: Devine, Hamwi, Miller & Robinson

Compare ideal body weight estimates from the Devine, Hamwi, Miller, and Robinson height-based equations using height and reference sex.

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In-Flight Cosmic Radiation Calculator - Estimate Airline Dose by Altitude and Time

Estimate in-flight cosmic-radiation dose from cruising altitude, time at cruise, and solar conditions with a transparent airline exposure calculator.

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Indoor Rowing Calorie Burn, Split & MET Calculator

Estimate indoor rowing calorie burn from distance, workout time, and body weight. View average 500 m split, speed, and the MET band used for the estimate.

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Insomnia Severity Index Calculator | Seven-Item ISI Score

Calculate an Insomnia Severity Index (ISI) score from seven sleep-impact ratings and view its standard severity range.

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Insulin Bolus Calculator - Carb Counting and Correction Doses

Estimate rapid-acting insulin doses using carb counts, current blood glucose, and correction factors.

insulin bolus calculator carb ratio correction factor CGM TDD

Insulin Sensitivity Factor Calculator - Diabetes Management Aid

Estimate your insulin sensitivity factor (ISF) from your total daily insulin dose using the 1500, 1700, or 1800 rule, in mg/dL and mmol/L. Educational estimate only.

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Langmuir Adsorption Calculator - Estimate Surface Coverage from K and P

Estimate Langmuir surface coverage from adsorbate pressure or concentration and an adsorption constant K for monolayer sites.

Langmuir adsorption calculator isotherm surface science BET Brunauer-Emmett-Teller

LASIK vs Glasses & Contacts Lifetime Cost Calculator

Compare LASIK, PRK, SMILE, or a lens implant with glasses or contacts over your chosen analysis period. Model surgery, follow-up care, insurance discounts, and yearly eyewear spending.

LASIK cost calculator vision correction LASIK vs contacts refractive surgery cost eye surgery pricing

LDL Cholesterol Estimator - Friedewald Formula

Estimate your low-density lipoprotein (LDL) cholesterol using the Friedewald formula from standard lab values for total cholesterol, HDL, and triglycerides...

LDL calculator Friedewald equation cholesterol estimator AACVPR AAPA

Loading Dose Calculator - Estimate a Rapid Pharmacokinetic Starting Dose

Estimate a loading dose from target concentration, volume of distribution, and bioavailability for IV or oral dosing when rapid therapeutic levels matter.

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Meat Smoking Time Calculator for Cook, Safety, and Fuel Planning

Estimate smoking time, safe internal temperature, barbecue stall timing, schedule range, and smoker fuel for brisket, pork, poultry, ribs, and salmon.

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Medication Half-Life Calculator | Estimate How Long a Dose Lingers

Estimate how much medication remains after a chosen number of hours, track elapsed half-lives, and gauge when a dose has mostly cleared.

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Medication Tapering Schedule Calculator & Discussion Worksheet

A medication tapering schedule worksheet: record the drug, class, current dose, symptoms, and prescriber-written dose steps. It does not generate dosing advice.

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Metabolic Age Calculator | Body Fat, Lean Mass and BMR

Work out a metabolic age from body-fat percentage, BMI and sex using the Deurenberg reference curve, alongside Mifflin-St Jeor BMR, lean-mass RMR and daily calories.

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Monthly Déjà Vu Frequency Estimator | Age, Sleep, Stress & Novelty

Estimate a monthly déjà vu frequency using an educational model of age, average sleep, stress level, and visits to genuinely new places.

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MRI Quench Oxygen Displacement Hazard Calculator

Model oxygen displacement when an MRI helium quench vents into the scan room: expansion ratio, mixed oxygen fraction, time below 19.5 percent, and purge time.

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Navy PRT Score Calculator: Official OPNAVINST 6110.1L Tables

Score the Navy PRT from the official OPNAVINST 6110.1L Guide-5A tables: push-ups, forearm plank and cardio points, category level and next-level targets.

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Noise Exposure Calculator - Safe Time and Daily Dose

Work out safe noise exposure time and daily noise dose at any decibel level using the NIOSH 3 dB and OSHA 5 dB exchange rates, with hearing-protection NRR derating.

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Omega-3 to Omega-6 Ratio Calculator | Daily Fatty Acid Balance

Calculate your omega-6 to omega-3 intake ratio, see whether it meets a 4:1 goal, and estimate the additional omega-3 needed.

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Orthodontic Treatment Cost & Duration Planner - Braces Calculator

Calculate total orthodontic treatment costs including braces, Invisalign, and aligners. Plan payment options, insurance coverage, and realistic treatment timelines by complexity.

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Oxygen Delivery, FiO₂ and ROX Index Calculator

Estimate delivered FiO₂ and calculate the ROX index, S/F and P/F ratios, alveolar PAO₂, A–a gradient, arterial oxygen content, and oxygen-cylinder runtime.

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Ozone Exposure Risk Calculator for EPA 8-Hour Benchmark and Inhaled Dose

Compare an ozone concentration with the EPA 8-hour benchmark and estimate inhaled dose from breathing rate, exposure time, and body weight.

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Peak Expiratory Flow Calculator | Predicted PEF, Percentage & Zones

Calculate predicted peak expiratory flow using Nunn & Gregg equations, compare a peak flow meter reading with predicted PEF, and identify its asthma action-plan zone.

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PHQ-9 Depression Symptom Score Calculator | 9-Item Total

Add nine PHQ-9 symptom-frequency responses to see the 0–27 depression screening score and its severity band.

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Pittsburgh Sleep Quality Index Calculator | Simplified PSQI Screener

Score seven Pittsburgh Sleep Quality Index components, including sleep efficiency from your bed and wake times, and see how the total reads against the standard cutoff.

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Potassium Intake Calculator: Daily mg Target by Age and Life Stage

Find your daily potassium Adequate Intake in mg by age and life stage, compare it with what you eat, and see how many servings of a food would close the gap.

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Pregnancy Due Date, Gestational Age & Trimester Calculator

Estimate a due date and gestational age from an LMP, conception date, or dating scan using Naegele's rule, cycle-length adjustment, and ACOG term definitions.

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Prostate Cancer Risk Calculator for PSA Density, Velocity and Free PSA

Compare total PSA with age-specific limits and calculate PSA density, PSA velocity and published free-PSA biopsy probabilities. Educational only.

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QTc Interval Calculator: Bazett, Fridericia, Framingham & Hodges

Calculate corrected QT (QTc) from an ECG QT interval and RR interval or heart rate with Bazett, Fridericia, Framingham, and Hodges formulas.

QTc calculator QT interval correction Bazett formula ACCF AHA

Radiation Dose Calculator | Convert Dose Rate to Session, Monthly & Annual mSv

Calculate external radiation dose from a posted dose rate, time in the field, and recurring visit schedule. Convert µSv/hour to mSv/hour and estimate session, monthly, and annual mSv totals.

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Radiation Shielding Thickness Calculator for Gamma and X-Rays

Work out gamma or X-ray shield thickness from a linear or mass attenuation coefficient, with half-value layer, buildup factor and inverse-square distance.

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Resin UV Post-Cure Dose Calculator | Exposure Time, Rotations & Heat

Calculate a resin print's UV post-cure exposure time, full turntable rotations, delivered dose, and estimated chamber heat from target dose, measured intensity, coverage, and thermal limits.

Resin UV Post-Cure Dose Calculator | Exposure Time, Rotations & Heat health calculator DLP FAQ IPA

Running Impact Force Calculator | Peak Vertical Ground Reaction Force

Estimate active peak vertical ground reaction force per running step from body mass, speed, cadence, and measured or estimated ground contact time.

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Skeletal Muscle Mass Index Calculator — SMI and ASMI Estimator

Estimate skeletal muscle mass index from weight, body fat, height and sex. Reports lean mass, total and appendicular muscle, ASMI, and sarcopenia screening bands.

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Sleep Apnea Risk Calculator | STOP-BANG Screening Tool

Estimate obstructive sleep apnea screening risk with the STOP-BANG questionnaire. Review symptoms, BMI, age, neck circumference, and a clear low, intermediate, or high risk result.

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Smoking Pack-Year Calculator | Calculate Pack Years from Cigarettes Per Day

Use this smoking pack-year calculator to estimate cumulative cigarette exposure from cigarettes per day and years smoked. Includes the standard formula, examples, interpretation guidance, limitations, and an optional pack-year mini-game.

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Sports Betting Arbitrage Calculator | Two-Outcome Surebet Stake Split

Calculate a two-outcome sports betting arbitrage stake split, implied probability, payout, and theoretical profit from decimal odds.

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Stair Climber Calorie Burn Calculator | Steps, Vertical Gain, and METs

Estimate stair climber calories from steps, step height, workout time, and body weight. See cadence, vertical meters climbed, and the MET used for the stair-session estimate.

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Standing Desk Calorie Burn Calculator | Standing vs Sitting Estimate

Estimate the extra calories burned by standing instead of sitting. Enter weight in kg and daily standing hours for a quick MET-based calorie comparison.

Standing Desk Calorie Burn Calculator | Standing vs Sitting Estimate health calculator MET MET stand − MET sit MET-based

Steady-State Drug Concentration Calculator for Peak, Trough and Loading Dose

Calculate one-compartment steady-state drug peak, trough and average concentrations, clearance, accumulation ratio, loading dose and time to steady state.

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Steps to Distance Converter | Estimate Walking Distance from Step Count

Turn a step count into estimated distance in miles and kilometers by entering your step length. Includes stride measurement tips, formula notes, and accuracy guidance.

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STOP-BANG Sleep Apnea Risk Calculator

Calculate a STOP-BANG score from snoring, tiredness, observed apnea, blood pressure, BMI, age, neck circumference, and sex to estimate sleep apnea screening risk.

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Sunburn Risk Calculator – Estimate Time to Burn from UV Index and SPF

Estimate a rough sunburn-time guide from UV index, skin type, and sunscreen SPF with this simple calculator.

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Thin-Walled Pressure Vessel Stress Calculator

Compute hoop and longitudinal stresses for cylindrical or spherical thin-walled pressure vessels.

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Tire Pressure Adjustment Calculator - Account for Temperature Changes

Calculate the recommended tire pressure based on temperature differences. Keep your tires properly inflated for safety and fuel efficiency.

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UV-C Dose Exposure Time Calculator for Irradiance Planning

Calculate the UV-C exposure time needed to deliver a target dose using measured irradiance or a point-source estimate from lamp power and distance.

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Vaccine Temperature Excursion Potency Risk Calculator

Model estimated vaccine potency loss during a temperature excursion from degrees above the limit, exposure duration, formulation sensitivity, and starting potency.

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Virtual Marathon Training Pacer: Splits, Zones and Riegel

Turn a goal marathon time into exact per-kilometre and per-mile splits, Riegel race-equivalent times and training pace zones for virtual or certified courses.

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Vitamin D Sunlight Exposure Calculator - Sun Minutes

Estimate how many minutes of midday sun your body needs for vitamin D based on UV index, skin type, and how much skin is exposed.

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Waist-to-Height Ratio Calculator for Abdominal Obesity Screening

Calculate your waist-to-height ratio, review the built-in screening category, and compare your waist measurement with the commonly used 0.5 reference.

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Walking Calorie Burn Calculator – Research‑Based Energy Estimate

Estimate calories burned on your walk using distance, time and body weight. This calculator applies research‑based MET values to give an approximate energy u...

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Wearable Device Battery Life Predictor for Smartwatch Runtime

Estimate smartwatch or fitness band runtime from battery capacity, average draw, daily wear time, and power-management efficiency.

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Weight Lifting Calorie Burn Calculator | MET-Based Strength Training Estimate

Estimate calories burned in a weight lifting workout from active lifting time, body weight, and intensity using MET values.

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Weight-Based Medication Dose and Liquid Volume Calculator

Calculate a weight-based medication dose in mg and the matching liquid volume in mL from a prescribed mg/kg dose and product concentration. Verify every dose with a licensed healthcare professional.

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Wells Score for DVT Calculator | Estimate Deep Vein Thrombosis Pre-Test Probability

Calculate the Wells score for suspected deep vein thrombosis using standard clinical criteria, review the MathML formula, and understand low, moderate, and high pre-test probability categories.

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Y-BOCS OCD Score Calculator | Yale-Brown Obsessive Compulsive Scale

Total the 10 Yale-Brown Obsessive Compulsive Scale items, see obsession and compulsion subscores, and read common Y-BOCS severity ranges. Not a diagnosis.

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