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Work and energy unit converter

Convert work and energy between kilowatt-hour, calorie, joule, electronvolt, erg, kilogram-force metre and foot-pound force.

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Joule

3600000 J

Equivalents

Kilowatt-hour1 kWh
Calorie860420.6501 cal
Joule3600000 J
Electronvolt2.246943267e+25 eV
Erg36000000000000 erg
Kilogram-force metre367097.8367 kgf·m
Foot-pound force2655223.737 ft·lbf

Converts the value to joules (the SI unit) with these equivalences:

  • 1 kWh = 3,600,000 J
  • 1 cal = 4.184 J (thermochemical calorie); 1 kcal = 1000 cal
  • 1 eV = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
  • 1 erg = 10⁻⁷ J
  • 1 kgf·m = 9.80665 J; 1 ft·lbf ≈ 1.3558 J

Use cases

  • Converting electricity use from kWh to joules or calories.
  • Solving physics problems with ergs or kilogram-force metres.
  • Expressing particle energies in electronvolts.

How it works

  1. 1

    Type the amount

    Decimals with a dot or a comma are accepted, as are negative values.

  2. 2

    Pick the units

    Choose the source and target units; the result and the equivalents table update instantly.

Technical details

  • Food-label "Calories" are actually kilocalories: multiply by 1000 when entering them as calories.
  • Other calories (IT, 15 °C) differ by less than 0.1%.
  • Results use 10 significant figures; very large or very small values are shown in scientific notation (e.g. 1e-10).

Frequently asked questions

How many joules are in a calorie?

4.184 J for the thermochemical calorie.

Are kW and kWh the same?

No: kW is power and kWh is energy, the amount used by 1 kW over one hour.

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