Health cluster
Fitness, Nutrition & Sleep Calculators
Plan workouts, macros, and rest: heart rate zones, VO2 max, protein and macro targets, keto and vegan meal planning, plus sleep cycle and sleep debt tools.
Top calculators
A short starting set for the most common fitness, nutrition & sleep calculators workflows.
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.
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.
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.
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.
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.
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.
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.
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.
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.