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, Velocity and Head Loss Calculator
Calculate pipe flow rate, mean velocity, Reynolds number, Darcy friction factor, straight-pipe head loss and pressure drop using actual Schedule 40 bores or a custom inside diameter.
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: Flow, Head, Shaft & Motor Power
Calculate hydraulic fluid power, pump shaft power, motor input power, annual energy use, and variable-speed pump scenarios from flow and head or pressure.
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: Hose Gallons, Flow and Cost
Estimate garden hose flow in gallons per minute, total watering gallons, outlet pressure, friction loss, and water cost from hose diameter, length, spigot pressure, nozzle, and run time.
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: Flow, Head, Shaft & Motor Power
Calculate hydraulic fluid power, pump shaft power, motor input power, annual energy use, and variable-speed pump scenarios from flow and head or pressure.
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, Velocity and Head Loss Calculator
Calculate pipe flow rate, mean velocity, Reynolds number, Darcy friction factor, straight-pipe head loss and pressure drop using actual Schedule 40 bores or a custom inside diameter.
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 Basin Calculator
Estimate roof runoff at one gutter outlet, compare it with an assumed rain chain capacity, and check splash basin storage and overflow time.
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.