Watt-hours to British thermal units
Type a value in watt-hours to see it in British thermal units straight away, or type in the second box to convert back.
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How to use it
- Type the value in the watt-hours box.
- Read the result in British thermal units as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
BTU = Wh × 3.412141633
Multiply the value in watt-hours by 3.412141633 to get British thermal units.
Example
To convert 25 Wh to British thermal units: 25 × 3.412141633 = 85.3035 BTU.
Conversion table
| Watt-hours (Wh) | British thermal units (BTU) |
|---|---|
| 1 | 3.41214 |
| 2 | 6.82428 |
| 3 | 10.2364 |
| 5 | 17.0607 |
| 10 | 34.1214 |
| 20 | 68.2428 |
| 25 | 85.3035 |
| 50 | 170.607 |
| 100 | 341.214 |
| 250 | 853.035 |
| 500 | 1,706.07 |
| 1,000 | 3,412.14 |
About the units
- Watt-hour
- The energy used by a one watt device in one hour, exactly 3600 joules. Common for battery and power bank capacity.
- British thermal unit
- The imperial unit of heat, using the International Table definition of exactly 1055.05585262 joules. Seen in air conditioner and heater ratings.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many British thermal units are in one watt-hour?
1 Wh = 3.41214 BTU exactly.
How do I convert watt-hours to British thermal units?
Use BTU = Wh × 3.412141633. For example, 25 Wh = 85.3035 BTU.
How many watt-hours are in one British thermal unit?
1 BTU = 0.293071 Wh.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.