Physics
Free physics calculators for motion, forces, electricity, thermodynamics and optics, with the formula and the units shown at every step of the working.
45 calculators
Mechanics
Elastic Potential Energy CalculatorEnergy stored in a stretched spring.Kinetic Energy CalculatorKinetic energy from mass and velocity.Momentum CalculatorMomentum and the impulse needed to change it.Terminal Velocity CalculatorTerminal velocity from mass, drag and area.Angular Acceleration CalculatorAngular acceleration from a change in angular velocity.Buoyancy CalculatorBuoyant force on a submerged or floating object.Centrifugal Force CalculatorCentrifugal force from mass, radius and angular speed.Centripetal Force CalculatorCentripetal force and acceleration for circular motion.Displacement CalculatorDisplacement and distance from velocity, acceleration, time.E = mc² CalculatorEnergy released from a mass, by E = mc squared.Friction CalculatorCoefficient of friction from friction and normal force.Friction Force CalculatorFriction force from a coefficient and normal force.Gravitational Force CalculatorGravitational force between two masses, by Newton's law.Hooke's Law CalculatorSpring force, constant or extension, by Hooke's law.Horsepower CalculatorHorsepower from force, distance and time, in any unit.Impulse CalculatorImpulse from force and time, or from a momentum change.Magnitude of Acceleration CalculatorMagnitude of acceleration from the x, y and z components.Normal Force CalculatorNormal force on an object, on flat or inclined ground.Potential Energy CalculatorGravitational potential energy from mass and height.Time Dilation CalculatorTime dilation from relative velocity, with the Lorentz factor.Velocity CalculatorVelocity from displacement and time, average or final.Work CalculatorWork done from force and displacement, in joules.
Electricity
Ohm's Law CalculatorVoltage, current, resistance and power from any two.Voltage Drop CalculatorVoltage drop along a cable run for a given load.Power Factor CalculatorPower factor, real power and apparent power.Voltage Divider CalculatorOutput voltage of a resistor divider.Capacitor Energy CalculatorEnergy stored in a capacitor from its charge and voltage.dB ConverterConvert between decibels and power or voltage ratios.Joules to Watts CalculatorConvert joules to watts given a time interval.RLC Impedance CalculatorImpedance, reactance and phase of a series RLC circuit.RMS Voltage CalculatorRMS, peak-to-peak and average voltage from a single peak.Ton to kW ConverterConvert refrigeration tons to kilowatts and BTU per hour.Watts to Amps CalculatorCurrent from power and voltage, DC or AC.Watts to Joules CalculatorConvert watts to joules given a time interval.Wire Size CalculatorWire gauge for a load, run length and voltage drop.
Thermodynamics & fluids
Ideal Gas Law CalculatorPressure, volume, temperature or moles from the others.Flow Rate CalculatorFlow rate from pipe diameter and velocity.Dew Point CalculatorDew point and vapour pressure from temperature and humidity.Heat Index CalculatorHeat index from temperature and relative humidity.Reynolds Number CalculatorReynolds number, and whether flow is laminar or turbulent.Specific Heat CalculatorHeat energy, mass or temperature change from specific heat.Thermal Expansion CalculatorLinear and volumetric expansion from a temperature change.Wind Chill CalculatorWind chill from temperature and wind speed.
Waves & rotation
Other categories
Every calculator on CalcMax, grouped by what you are trying to work out.
MathPercentages, fractions, geometry, algebra and number bases.FinanceLoans, mortgages, interest, tax and investment returns.Health & FitnessBMI, calories, body fat, heart rate and nutrition targets.StatisticsAverages, standard deviation, probability and grade curves.Date & TimeAge, date differences, durations, time zones and conversions.ConstructionConcrete, gravel, mulch, paint, tile and square footage.BiologyGenetics, populations, microbiology and animal dosing.SportsPace, splits, running and cycling performance metrics.ChemistryMolarity, dilutions, reactions and stoichiometry.Food & CookingRecipe scaling, baking ratios, cooking conversions.ElectronicsOhm's law, resistors, wire gauge, batteries and signals.AutomotiveFuel cost, gas mileage and trip planning.OtherBra sizing and random password generation.