Physics calculators
Motion, force, energy, and electrical basics.
- Ohm's Law Calculator (V = IR, with Power)
Solve V = IR for voltage, current or resistance, with the power in watts and the energy per hour.
- Velocity Calculator (Average Velocity = Distance ÷ Time)
Average velocity from distance and time, in m/s, km/h and mph, with the working.
- Acceleration Calculator (Change in Velocity ÷ Time)
Average acceleration from initial and final velocity and time, in m/s² and g, with the distance covered.
- Force Calculator (Newton's Second Law, F = ma)
Net force from mass and acceleration in newtons, kN, pounds-force and kgf, compared with the object's weight.
- Kinetic Energy Calculator (½mv², any mass and speed unit)
Kinetic energy from mass and speed in kg or lb and m/s, km/h, mph or ft/s, working shown.
- Gravitational Potential Energy Calculator (PE = mgh)
Potential energy from mass and height in kg or lb and m or ft, with the speed a drop from that height would give.
- Density Calculator (Mass ÷ Volume, kg/m³, g/cm³, lb/ft³)
Density from mass and volume in kg/m³, g/cm³ and lb/ft³, with specific gravity and whether it floats in water.
- Projectile Motion Calculator (Range, Max Height, Time of Flight)
Range, maximum height and time of flight of a projectile from launch speed and angle, no air resistance, working shown.
- Wavelength to Frequency Calculator (Light, Sound, Any Wave)
Wavelength from frequency or frequency from wavelength for light, sound in air or water, or any wave speed, with SI prefixes and photon energy.
- Torque Calculator (τ = r F sin θ, N·m and lb·ft)
Torque from force, lever arm and angle in N·m, lb·ft and kgf·m, with the effective lever arm and the working.
- Free Fall Calculator (Time, Height and Impact Speed)
How far and how fast something falls in a given time, how long a drop takes, or the height behind an impact speed — no air resistance.
- Momentum Calculator (p = mv)
Linear momentum from mass and velocity, with the kinetic energy of the same motion and the force to stop it in a second.