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Physics & Engineering
Wind Chill Calculator
Wind Chill Calculator finds feels-like temperature from air temperature and wind speed, with °F/°C results, temperature drop and formula-range guidance.
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Physics & Engineering
Heat Index Calculator
Calculate heat index from air temperature and relative humidity. Get instant feels-like temperature results in Fahrenheit and Celsius.
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Physics & Engineering
Dew Point Calculator
Dew Point Calculator finds dew point from air temperature and relative humidity, with results in °C and °F plus moisture and condensation guidance.
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Physics & Engineering
Boiler Size Calculator
Boiler Size Calculator estimates BTU/hr and kW from floor area, ceiling height, climate, insulation, windows, occupants and hot-water demand.
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Physics & Engineering
Heat Pump Size Calculator
Estimate heat pump size in BTU, tons, and kW based on room area, ceiling height, climate, insulation, windows, and occupancy.
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Physics & Engineering
HVAC BTU Calculator
HVAC BTU Calculator estimates room cooling capacity in BTU/hr, tons and kW from area, ceiling height, insulation, sunlight, occupants and appliance heat.
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Physics & Engineering
CFM Calculator
Use our free CFM Calculator to calculate airflow from room size and air changes per hour. Fast, accurate, and easy to use.
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Physics & Engineering
Chain Length Calculator
Chain Length Calculator finds recommended bike chain links, theoretical links and physical length from chainstay, front and rear teeth, pitch and rounding.
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Physics & Engineering
Gear Inches Calculator
Gear Inches Calculator calculates bike gear inches, gear ratio and development from chainring teeth, rear cog teeth and wheel diameter for easy comparison.
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Physics & Engineering
Pulley Speed Calculator
Calculate driven pulley RPM, driver RPM, belt speed, or pulley diameter using pulley sizes and rotational speed with multiple units.
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Physics & Engineering
Pulley Ratio Calculator
Calculate pulley ratio, driven RPM, driver RPM, or pulley diameter with metric and imperial units. Includes belt speed and speed ratio results.
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Physics & Engineering
Water Horsepower Calculator
Calculate water horsepower, pump horsepower, flow rate, head, or efficiency using GPM, feet, metric units, and pump performance formulas.
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Physics & Engineering
Pump Horsepower Calculator
Calculate pump horsepower, hydraulic power, flow rate, head, or pump efficiency using metric and US units with instant results.
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Physics & Engineering
Hydraulic Cylinder Force Calculator
Calculate hydraulic cylinder extension force, retraction force, pressure, bore diameter, or rod diameter with metric and imperial units.
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Physics & Engineering
Bernoulli Equation Calculator
Bernoulli Equation Calculator finds pressure, velocity or elevation between two points using density, gravity and flow conditions, with unit conversion.
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Physics & Engineering
Reynolds Number Calculator
Calculate Reynolds number, velocity, pipe diameter, or viscosity and identify laminar, transitional, or turbulent fluid flow.
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Physics & Engineering
Pipe Flow Calculator
Calculate pipe flow rate, fluid velocity, or internal pipe diameter using Q = Av with multiple metric and US units.
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Physics & Engineering
Flow Rate Calculator
Calculate volumetric flow rate, cross-sectional area, or fluid velocity using Q = Av with multiple flow, area, and velocity units.
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Physics & Engineering
Fluid Pressure Calculator
Calculate fluid pressure, density, or depth using P = ρgh with multiple pressure, density, and length units.
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Physics & Engineering
Coefficient of Friction Calculator
Coefficient of Friction Calculator calculates μ, friction force or normal force from any two known values using F = μN, with force-unit conversion.
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Physics & Engineering
Friction Calculator
Calculate friction force, coefficient of friction, or normal force using F = μN with multiple force units and instant results
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Physics & Engineering
Elastic Potential Energy Calculator
Elastic Potential Energy Calculator finds spring energy, spring constant or displacement from any two known values, with unit conversion and spring force.
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Physics & Engineering
Hooke's Law Calculator
Calculate spring force, spring constant, or displacement using Hooke's law with multiple force, stiffness, and length units.
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Physics & Engineering
Spring Force Calculator
Spring Force Calculator finds force, spring constant or displacement from any two known values using Hooke’s law, with unit conversion and stored energy.
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