You can use the online version of Energy Converter on our website
or download Energy Converter
for your Windows or Mac computer or for your mobile device with iOS or Android.
Free energy converter online
You can use the free energy unit converter to convert between US, imperial and metric energy units.
Supported energy units: joules , kilojoules, calories, kilocalories, watt hours, kilowatt hours, electronvolts, British thermal units or BTU, therms (US) and foot pounds. For example, you can convert from joules to calories (J to cal), kilocalories to kilojoules (kcal to kJ), kilowatt-hours to joules (kWh to J), calories to watt-hours (c to Wh), electron-volts to joules (eV to J), etc.
With he Flip button (two arrows in the bottom left corner) you can easily switch between the "from" and "to" energy units.
The energy conversion calculator supports fractional values and shows results in in the decimal and fractional forms.
You can select the number of decimal places you want to display. By default, the energy calculator displays 2 decimal places. To round results to the nearest whole number, select 0 decimal places in the Settings.
For fractions, you can select rounding to the nearest 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256. By default, the app rounds fractions to the nearest 1/32. If you do not need to round fractions, just select "-".