To convert watt hours to btu, multiply by 3.412141633.
The calculation uses 1 Wh = 3.412141633 BTU. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
Uses the International Table BTU. Other BTU definitions differ slightly.
The formula
Wh- Input unit: watt hours
BTU- Output unit: btu
How to use this calculator
- Enter a value in Wh.
- Multiply by the stored conversion factor.
- Read the result in BTU; divide by the same factor to convert back.
Worked examples
Worked conversion
1 Wh × 3.412141633 ≈ 3.412141633 BTU.
Reverse conversion
3.412141633 BTU ÷ 3.412141633 ≈ 1 Wh. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 3.412141633 BTU per Wh. Uses the International Table BTU. Other BTU definitions differ slightly.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
Wh to BTU table
| Wh | BTU (rounded) |
|---|---|
| 0 | 0 |
| 1 | 3.412141633 |
| 2 | 6.824283266 |
| 5 | 17.06070817 |
| 10 | 34.12141633 |
| 100 | 341.2141633 |