#1
Bernoulli Equation Calculator
Bernoulli Equation Calculator finds pressure, velocity or elevation between two points using density, gravity and flow conditions, with unit conversion.
#2
Boiler Size Calculator
Boiler Size Calculator estimates BTU/hr and kW from floor area, ceiling height, climate, insulation, windows, occupants and hot-water demand.
#3
Boiling Point at Altitude Calculator
Boiling Point at Altitude Calculator estimates water boiling temperature from elevation in meters or feet, with results in °C and °F for high-altitude use.
#4
CFM Calculator
Use our free CFM Calculator to calculate airflow from room size and air changes per hour. Fast, accurate, and easy to use.
#5
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.
#6
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.
#7
Density Altitude Calculator
Density Altitude Calculator finds density altitude, pressure altitude and ISA deviation from field elevation, altimeter setting and air temperature.
#8
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.
#9
Displacement Calculator
Displacement Calculator finds position change, initial position or final position using Δx = x₂ − x₁, with automatic conversion across common length units.
#10
Efficiency Calculator
Free online Efficiency Calculator to find efficiency percentage from input & output values instantly. Fast, accurate, and easy to use.
#11
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.
#12
Escape Velocity Calculator
Calculate escape velocity, mass, or radius using gravitational formulas with multiple units for planets, moons, and other objects.
#13
Flow Rate Calculator
Calculate volumetric flow rate, cross-sectional area, or fluid velocity using Q = Av with multiple flow, area, and velocity units.
#14
Fluid Pressure Calculator
Calculate fluid pressure, density, or depth using P = ρgh with multiple pressure, density, and length units.
#15
Free Fall Calculator
Calculate free fall time, final velocity, or distance using gravity, height, and initial velocity with this accurate physics calculator.
#16
Friction Calculator
Calculate friction force, coefficient of friction, or normal force using F = μN with multiple force units and instant results
#17
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.
#18
Gravitational Force Calculator
Gravitational Force Calculator finds force, either mass or center-to-center distance using Newton’s law, with unit conversion and scientific notation.
#19
Heat Index Calculator
Calculate heat index from air temperature and relative humidity. Get instant feels-like temperature results in Fahrenheit and Celsius.
#20
Heat Pump Size Calculator
Estimate heat pump size in BTU, tons, and kW based on room area, ceiling height, climate, insulation, windows, and occupancy.
#21
Hooke's Law Calculator
Calculate spring force, spring constant, or displacement using Hooke's law with multiple force, stiffness, and length units.
#22
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.
#23
Hydraulic Cylinder Force Calculator
Calculate hydraulic cylinder extension force, retraction force, pressure, bore diameter, or rod diameter with metric and imperial units.
#24
Mechanical Advantage Calculator
Calculate ideal and actual mechanical advantage using effort force, load force, effort distance, and load distance with this free calculator.
#25
Pipe Flow Calculator
Calculate pipe flow rate, fluid velocity, or internal pipe diameter using Q = Av with multiple metric and US units.
#26
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.
#27
Pulley Speed Calculator
Calculate driven pulley RPM, driver RPM, belt speed, or pulley diameter using pulley sizes and rotational speed with multiple units.
#28
Pump Horsepower Calculator
Calculate pump horsepower, hydraulic power, flow rate, head, or pump efficiency using metric and US units with instant results.
#29
Relative Humidity Calculator
Relative Humidity Calculator finds RH percentage from air temperature and dew point in °C or °F, with temperature–dew point spread and moisture guidance.
#30
Reynolds Number Calculator
Calculate Reynolds number, velocity, pipe diameter, or viscosity and identify laminar, transitional, or turbulent fluid flow.
#31
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.
#32
Velocity Calculator
Calculate velocity, distance, or time instantly. Enter distance and time with multiple unit options including m/s, km/h, mph, and ft/s.
#33
Water Horsepower Calculator
Calculate water horsepower, pump horsepower, flow rate, head, or efficiency using GPM, feet, metric units, and pump performance formulas.
#34
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.
#35
Work Calculator
Work Calculator finds mechanical work in joules from force, displacement and angle using W = F × d × cos(θ), with common force and distance units.
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