Ohm's Law Calculator
Enter two of voltage, current and resistance to find the third and the power, using Ohm's law (V = I × R).
Half-Life Calculator
Enter three of the initial amount, remaining amount, elapsed time and half-life to find the fourth, plus the decay constant.
Acceleration Calculator
Find acceleration from initial speed, final speed and time, or the final speed or time from the acceleration, with the distance covered and g-force.
Kinetic Energy Calculator
Calculate kinetic energy from mass and speed, or the mass or speed from the energy. Momentum is shown too.
Impact Force Calculator
Calculate the average force in a collision from the mass, impact speed and the stopping distance or stopping time.
Density Calculator
Calculate density from mass and volume, or the mass or volume from the density, with ρ = m ÷ V.
Ideal Gas Law Calculator
Enter three of pressure, volume, amount of substance and temperature to find the fourth with the ideal gas equation PV = nRT.
Van der Waals Equation Calculator
Pick a gas and enter the amount, volume and temperature to calculate the real gas pressure with the van der Waals equation, compared with an ideal gas.
Flow Rate Calculator
Calculate the flow rate from pipe diameter and flow velocity, or the velocity from the flow rate and diameter, with Q = A × v.
Reynolds Number Calculator
Calculate the Reynolds number from fluid density, velocity, characteristic length and viscosity, and see whether the flow is laminar or turbulent.
Angular Velocity Calculator
Calculate angular velocity in rad/s from an angle and time, from revolutions per minute (rpm), or from linear speed and radius.
Terminal Velocity Calculator
Calculate the top speed a falling object reaches (terminal velocity) from its mass, cross-sectional area, drag coefficient and the fluid density.
Buoyancy Calculator
Calculate the buoyant force (Archimedes' principle) from the fluid density and the object's volume and mass, and see whether it floats or sinks.
Thermal Expansion Calculator
Calculate how much a material lengthens or expands when heated, from its initial length or volume, expansion coefficient and temperature change.
Capacitor Energy Calculator
Calculate the energy stored in a capacitor from its capacitance and voltage, or the voltage or capacitance from the energy. The stored charge is shown too.
Potential Energy Calculator
Calculate gravitational potential energy from mass, height and gravity, or the mass or height from the energy.
Elastic Potential Energy Calculator
Calculate the elastic potential energy stored in a spring from the spring constant and stretch, or the spring constant or stretch from the energy.
Time Dilation Calculator
Enter the time that passes on a moving clock and its speed as a percentage of light speed to find, with special relativity, how much time passes for an observer at rest.