Power (Physics) Calculator Formula

Understand the math behind the power (physics) calculator. Each variable explained with a worked example.

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Formulas Used

Power

power = work / time

Power (kW)

power_kw = work / time / 1000

Power (hp)

power_hp = work / time / 745.7

Variables

VariableDescriptionDefault
workWork Done(J)1000
timeTime(s)5

How It Works

Mechanical Power

Power is the rate at which work is performed or energy is transferred.

Formula

P = W / t

One watt equals one joule per second. To convert watts to horsepower, divide by 745.7.

Worked Example

A motor does 1000 J of work in 5 seconds.

work = 1000time = 5
  1. 01P = W / t
  2. 02P = 1000 / 5
  3. 03P = 200 W
  4. 04P = 0.2 kW
  5. 05P = 200 / 745.7 = 0.268 hp

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