Physics Calculators

Enter the launch speed, angle and launch height and get the whole flight — horizontal and vertical velocity, time to peak, maximum height, range, impact speed, a trajectory plot and a position-over-time table.

Enter any two of voltage, current and resistance and get the third — with millivolts, milliamps and kilo/mega-ohms selectable per field.

Enter any two of force, mass and acceleration and get the third — with mass in kg, g or lb and acceleration in m/s², ft/s² or g.

Enter any two of kinetic energy, mass and speed and get the third, with the energy readable in joules, kJ, calories or kWh.

Give the height or the fall time and get the other, plus the impact speed — with g adjustable for the Moon, Mars or a textbook rounding of 9.8.

Enter any two of speed, distance and time and the third is solved for — in m/s, km/h or mph, metres, kilometres or miles, seconds, minutes or hours.

Enter any two of acceleration, change in velocity and time taken and get the third, in m/s², ft/s² or multiples of g.

Give the height or the fall time and get the other, plus the impact speed — with g adjustable for the Moon, Mars or a textbook rounding of 9.8.

Enter the launch speed, angle and launch height and get the whole flight — horizontal and vertical velocity, time to peak, maximum height, range, impact speed, a trajectory plot and a position-over-time table.

Enter any two of force, mass and acceleration and get the third — with mass in kg, g or lb and acceleration in m/s², ft/s² or g.

Get p = mv for a single object, or run a one-dimensional collision — elastic, where kinetic energy survives, or inelastic, where the objects stick together.

Enter a force and a time interval to get the impulse — plus the velocity change it gives a mass — or read it the other way as a change in momentum.

Enter any two of kinetic energy, mass and speed and get the third, with the energy readable in joules, kJ, calories or kWh.

Enter any three of potential energy, mass, g and height and the fourth is solved for — with g pre-filled at 9.8 m/s² and changeable for other worlds.

Sum kinetic and potential energy at the top of the hill — or give the top and all but one value at the bottom, and conservation of energy solves for it.

Enter any three of work, force, distance and angle and the fourth is solved for — W = Fd cos θ, in joules, kJ or calories.

Two arrangements in one tool: P = W ÷ t for work done over a time, and P = F × v for a force maintained at a steady speed — in watts, kW or horsepower.

Enter any three of torque, lever arm, force and angle and the fourth is solved for — τ = rF sin θ, in N·m, kN·m or ft·lb.

Enter any two of force, spring constant and extension and get the third — with k in N/m, N/cm or N/mm and extension in metres, centimetres or millimetres.

T = 2π√(m/k) for a spring or T = 2π√(L/g) for a pendulum — enter the pair, get the period, the frequency and the angular frequency, with the small-angle caveat named.

The attraction between two masses from Newton's law — enter any three of force, the two masses and the separation, with Earth's mass and radius pre-filled as the sample.

Enter any two of voltage, current and resistance and get the third — with millivolts, milliamps and kilo/mega-ohms selectable per field.

Enter any two of P, V, I and R and the other two are derived — the tool picks the arrangement that matches the pair you gave.

Add as many resistors as you like, choose series or parallel, and get the equivalent resistance plus each one's share of the voltage or current.

Enter any two of wave speed, frequency, wavelength and period and the other two are derived — with a clear explanation when only frequency and period are given.

Enter any two of density, mass and volume and get the third — in kg/m³, g/cm³ or g/mL, with the answer cross-checked against the density of water.

Enter any two of pressure, force and area and get the third — readable in Pa, kPa, MPa, bar, atm, psi or mmHg.

Enter any two of speed, distance and time and the third is solved for — in m/s, km/h or mph, metres, kilometres or miles, seconds, minutes or hours.

Enter any two of acceleration, change in velocity and time taken and get the third, in m/s², ft/s² or multiples of g.

Give the height or the fall time and get the other, plus the impact speed — with g adjustable for the Moon, Mars or a textbook rounding of 9.8.

Enter the launch speed, angle and launch height and get the whole flight — horizontal and vertical velocity, time to peak, maximum height, range, impact speed, a trajectory plot and a position-over-time table.

Enter any two of force, mass and acceleration and get the third — with mass in kg, g or lb and acceleration in m/s², ft/s² or g.

Get p = mv for a single object, or run a one-dimensional collision — elastic, where kinetic energy survives, or inelastic, where the objects stick together.

Enter any two of kinetic energy, mass and speed and get the third, with the energy readable in joules, kJ, calories or kWh.

Enter any three of potential energy, mass, g and height and the fourth is solved for — with g pre-filled at 9.8 m/s² and changeable for other worlds.

Enter any three of work, force, distance and angle and the fourth is solved for — W = Fd cos θ, in joules, kJ or calories.

Two arrangements in one tool: P = W ÷ t for work done over a time, and P = F × v for a force maintained at a steady speed — in watts, kW or horsepower.

Enter any three of torque, lever arm, force and angle and the fourth is solved for — τ = rF sin θ, in N·m, kN·m or ft·lb.

Enter any two of force, spring constant and extension and get the third — with k in N/m, N/cm or N/mm and extension in metres, centimetres or millimetres.

Enter any two of voltage, current and resistance and get the third — with millivolts, milliamps and kilo/mega-ohms selectable per field.

Enter any two of P, V, I and R and the other two are derived — the tool picks the arrangement that matches the pair you gave.

Add as many resistors as you like, choose series or parallel, and get the equivalent resistance plus each one's share of the voltage or current.

Enter any two of wave speed, frequency, wavelength and period and the other two are derived — with a clear explanation when only frequency and period are given.

Enter any two of density, mass and volume and get the third — in kg/m³, g/cm³ or g/mL, with the answer cross-checked against the density of water.

Enter any two of pressure, force and area and get the third — readable in Pa, kPa, MPa, bar, atm, psi or mmHg.

Enter a force and a time interval to get the impulse — plus the velocity change it gives a mass — or read it the other way as a change in momentum.

Sum kinetic and potential energy at the top of the hill — or give the top and all but one value at the bottom, and conservation of energy solves for it.

The attraction between two masses from Newton's law — enter any three of force, the two masses and the separation, with Earth's mass and radius pre-filled as the sample.

T = 2π√(m/k) for a spring or T = 2π√(L/g) for a pendulum — enter the pair, get the period, the frequency and the angular frequency, with the small-angle caveat named.