Science cluster
Fluid & Aerodynamics Calculators
Compute flow rates, pressure drop, viscosity, buoyancy, and drag for pipes, pumps, and aerodynamic systems.
Top calculators
A short starting set for the most common fluid & aerodynamics calculators workflows.
Pipe Flow Rate Calculator: Flow, Head Loss & Reynolds Number
Size any round pipe: flow rate, velocity, Reynolds number, Darcy friction factor and head loss from Colebrook-White, with schedule 40 IDs and roughness data.
Hydraulic Ram Pump Calculator: Delivered Flow and Daily Volume
Estimate delivered flow, waste flow and daily volume from a hydraulic ram pump using drive flow, drive head, delivery head and D'Aubuisson efficiency.
Compressed Air CFM Calculator | Size a Compressor for Pneumatic Tools
Size an air compressor by CFM: duty-cycle adjusted demand, safety margin, receiver volume from the ideal-gas formula, and Schedule 40 pipe pressure drop.
OTEC Cold-Water Pipe Pumping Power Calculator | Intake Friction and Auxiliary Load
Estimate OTEC cold-water intake friction head and pumping power from pipe length, diameter, flow rate, roughness, seawater density, viscosity, and pump efficiency.
Hydraulic Pump Power Calculator - Shaft and Motor Input Power
Turn pump flow plus head or differential pressure into hydraulic, shaft (brake) and motor input power in kW and hp, with affinity-law speed scenarios.
Sprayer Calibration Calculator: Gallons per Acre and Field Volume
Calibrate a boom sprayer: gallons per acre from nozzle flow, ground speed and spacing, with catch-test, timed-course and square-root pressure conversions.
Darcy-Weisbach Pipe Friction Head Loss & Pressure Drop Calculator
Estimate pipe-friction head loss, velocity, friction factor, and water-equivalent pressure drop for a full circular pipe using Darcy-Weisbach and Swamee-Jain.
Wing Aspect Ratio Calculator: AR, MAC and Induced Drag
Work out wing aspect ratio from span and reference area, with taper chords, mean aerodynamic chord, induced drag coefficient and 3D lift-curve slope.
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Browse 22 calculators matched to this topic, or return to the Science category.
Air Compressor CFM Calculator - SCFM, ACFM and Tank Size
Size an air compressor from tool load factor: average SCFM demand, ACFM and ICFM at your altitude and inlet temperature, plus DOE receiver tank volume in gallons.
Compressed Air CFM Calculator | Size a Compressor for Pneumatic Tools
Size an air compressor by CFM: duty-cycle adjusted demand, safety margin, receiver volume from the ideal-gas formula, and Schedule 40 pipe pressure drop.
Darcy-Weisbach Pipe Friction Head Loss & Pressure Drop Calculator
Estimate pipe-friction head loss, velocity, friction factor, and water-equivalent pressure drop for a full circular pipe using Darcy-Weisbach and Swamee-Jain.
Drainage Tile Spacing Calculator for Subsurface Drainage Design
Estimate lateral tile spacing for subsurface drainage from soil conductivity, drain depth, water-table target, tile diameter, and drainage coefficient.
Drip Irrigation Emitter Spacing Calculator and Wetting Bulb Game
Calculate drip irrigation emitter spacing from crop water demand, emitter flow, run time, soil wetting diameter and infiltration rate, then test your design in an interactive wetting-bulb game.
Garden Hose Water Use Cost Calculator: Gallons and Dollars
Work out garden hose flow in gallons per minute from hose diameter, length, supply pressure and nozzle bore, then price the gallons a watering session uses.
Groundwater Travel Time Calculator | Darcy Velocity and Advective Arrival Time
Estimate groundwater seepage velocity and advective travel time with Darcy’s Law from hydraulic conductivity, gradient, effective porosity, and flow-path length.
Heat Exchanger Sizing Calculator – Estimate Required Area from LMTD
Interactive heat exchanger sizing calculator to estimate required area using mass flow rate, heat capacity, inlet/outlet temperatures, overall heat-transfer...
Hydraulic Press Calculator - Pascal's Principle
Determine output force, pressure, and mechanical advantage of a hydraulic press using piston sizes and an applied input force.
Hydraulic Pump Power Calculator - Shaft and Motor Input Power
Turn pump flow plus head or differential pressure into hydraulic, shaft (brake) and motor input power in kW and hp, with affinity-law speed scenarios.
Hydraulic Ram Pump Calculator: Delivered Flow and Daily Volume
Estimate delivered flow, waste flow and daily volume from a hydraulic ram pump using drive flow, drive head, delivery head and D'Aubuisson efficiency.
Indoor Air Exchange Upgrade Planner for ACH, CADR, and Event Risk
Estimate room volume, combined ventilation and filtration airflow, ACH, CFM per person, target airflow gaps, and event infection probability for an indoor air upgrade plan.
OTEC Cold-Water Pipe Pumping Power Calculator | Intake Friction and Auxiliary Load
Estimate OTEC cold-water intake friction head and pumping power from pipe length, diameter, flow rate, roughness, seawater density, viscosity, and pump efficiency.
Pipe Flow Rate Calculator: Flow, Head Loss & Reynolds Number
Size any round pipe: flow rate, velocity, Reynolds number, Darcy friction factor and head loss from Colebrook-White, with schedule 40 IDs and roughness data.
Projectile Motion Calculator with Air Drag and Wind
Simulate a projectile launch with air drag and wind. Adjust speed, angle, mass, drag coefficient, area, wind, and time step to inspect the flight path and energy change.
Rain Chain Flow Capacity and Splash Control Calculator
Compare roof runoff with rain chain conveyance and splash basin drawdown using the rational method, IPC leader capacities and NOAA design rainfall intensity.
Rayleigh Number Calculator for Natural Convection Onset
Calculate the Rayleigh number from gravity, thermal expansion, temperature difference, length scale, kinematic viscosity, and thermal diffusivity to estimate whether a fluid layer will stay conduction-driven or break into natural convection.
Shower Water Usage Calculator: Gallons, Energy and Cost
Calculate shower water use, water-heating energy and household cost from flow rate, duration, temperatures, heater efficiency and utility prices.
Sprayer Calibration Calculator: Gallons per Acre and Field Volume
Calibrate a boom sprayer: gallons per acre from nozzle flow, ground speed and spacing, with catch-test, timed-course and square-root pressure conversions.
Storm Sewer Pipe Sizing Calculator | Manning Equation Diameter and Velocity
Size a full-flow circular storm sewer with the Manning equation. Enter design flow, pipe slope, and roughness to estimate required diameter and velocity for preliminary drainage design.
Wing Aspect Ratio Calculator: AR, MAC and Induced Drag
Work out wing aspect ratio from span and reference area, with taper chords, mean aerodynamic chord, induced drag coefficient and 3D lift-curve slope.
Young-Laplace Surface Tension Pressure Difference Calculator for Bubbles and Drops
Solve the pressure difference across a soap bubble or liquid drop, or find surface tension or radius with the Young-Laplace relation.