Ohm’s law & electrical power
Enter any two of the four quantities (voltage, current, resistance, power) to calculate the remaining two values.
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Physics calculators
Ohm’s law, Newton’s F = ma, kinetic and potential energy, free fall, ideal gas law (PV = nRT), waves, density, Snell’s law and thin lenses.
Newton’s second law (F = m·a)
Leave one of force, mass or acceleration empty to solve for the missing SI value.
Open calculatorKinetic & potential energy
Calculate translational kinetic energy and gravitational potential energy in joules (J).
Open calculatorFree fall
Starting from rest in a vacuum: enter either fall time or drop distance and leave the other field blank.
Open calculatorIdeal gas law (PV = nRT)
Leave one of pressure (P), volume (V), moles (n) or temperature (T) blank to solve the ideal gas equation.
Open calculatorWave speed (v = f · λ)
Leave one of wave speed, frequency or wavelength blank to calculate the missing value.
Open calculatorDensity, mass & volume
Leave one of mass, volume or density blank to solve ρ = m / V.
Open calculatorSnell’s law of refraction
Calculate the angle of refraction across an optical boundary (n₁, n₂) or check for total internal reflection.
Open calculatorThin-lens equation
Leave one of focal length (f), object distance (u) or image distance (v) blank to solve for the third value and magnification.
Open calculatorDriving time
Calculate travel time in hours and minutes from trip distance and average speed.
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