Power Calculator

Results

Enter values and click Calculate to see results

Power Formulas

Basic Power Formula

\[ P = \frac{W}{t} \]

Where:

  • \( P \) = Power (Watts)
  • \( W \) = Work or Energy (Joules)
  • \( t \) = Time (seconds)
Rearranged Formulas

To calculate Work: \[ W = P \times t \]

To calculate Time: \[ t = \frac{W}{P} \]

Unit Conversions

1 kJ = 1000 J

1 cal = 4.184 J

1 kcal = 4184 J

1 kWh = 3.6×10⁶ J

1 min = 60 s

1 hr = 3600 s

1 kW = 1000 W

1 hp ≈ 745.7 W

Help & Information

Power is the rate at which work is done or energy is transferred over time. It's a measure of how quickly energy is being used or converted.

In the International System of Units (SI), power is measured in watts (W), where one watt is equal to one joule per second.

  • Mechanical Power: Power involved in moving objects (e.g., engines, human movement)
  • Electrical Power: Power in electrical circuits (e.g., light bulbs, appliances)
  • Thermal Power: Power related to heat transfer (e.g., heaters, cooling systems)

  1. Select what you want to calculate (Power, Work, or Time)
  2. Enter the known values in the appropriate fields
  3. Select the units for each value
  4. Click "Calculate" to see the results
  5. View the calculation steps to understand how the result was obtained

  • Watt (W): SI unit of power (1 W = 1 J/s)
  • Kilowatt (kW): 1 kW = 1000 W (used for electrical devices)
  • Horsepower (hp): 1 hp ≈ 745.7 W (used for engines and motors)