Energy Conversion Calculator
Convert joules, watt-hours, kilowatt-hours, Btu and US therms.
Result
Converted energy: 1 kWh
Btu here means the International Table Btu and therm means the US therm. Other historical Btu definitions have slightly different factors.
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Results are estimates based on the ratings, usage and prices you enter. Actual consumption, losses, tariffs and equipment performance vary. Check your bill, meter and manufacturer information before relying on the result. Read the full disclaimer
How to use the Energy Conversion Calculator
- Enter an energy value and choose its source unit from the field picker.
- Read the same unrounded quantity in kWh, Wh, MJ, J, Btu and US therms.
- Use the named Btu and therm definitions when comparing with another reference.
One energy quantity, several conventions
The calculator converts the entered value to joules, the SI energy unit, then derives every display from that same value. It never converts one rounded display into the next.
1 Wh = 3,600 J1 kWh = 3.6 MJ1 Btu (IT) = 1,055.05585262 J1 US therm = 105,480,400 JPower units such as watts and kilowatts are intentionally absent because power is a rate of energy transfer, not energy itself.
The conversion factors follow NIST Special Publication 811.
With your numbers
- The entered energy is 3,600,000 J in the SI base unit.
- That equals 1 kWh or 3.6 MJ.
- Every displayed value is converted from the same unrounded joule quantity.
Quick reference
Btu here means the International Table Btu and therm means the US therm. Other historical Btu definitions have slightly different factors.
| Example | Converted energy |
|---|---|
| 1 kWh | 1 kWh |
| 10 kWh | 10 kWh |
| 0.5 kWh | 0.5 kWh |
| 1 kWh international | 1 kWh |
| 2.5 kWh international | 2.5 kWh |
| 100 kWh international | 100 kWh |
Common questions about the Energy Conversion Calculator
- Is a kilowatt the same as a kilowatt-hour?
- No. A kilowatt is power, while a kilowatt-hour is energy. One kilowatt maintained for one hour transfers one kilowatt-hour.
- Which Btu does this use?
- The International Table Btu, equal to 1,055.05585262 joules. Historical Btu definitions differ slightly.
- Why are all units shown at once?
- It prevents repeated source-to-target conversions and makes it easy to compare several specifications from one exact SI quantity.