Convert BTU to Watt-hours
1 British thermal unit (BTU) equals 0.2930710702 watt-hours (Wh).
1 BTU = 0.2930710702 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU to watt-hour converter to paste a column from Excel.
How to Convert BTU to Watt-hour
- 1 BTU = 0.2930710702 Wh
- 1 Wh = 3.412141633 BTU
- Example: convert 15 BTU to Wh: 15 BTU = 15 × 0.2930710702 Wh = 4.396066053 Wh
Reference conditions. BTU: International Table BTU (BTU_IT), 1055.05585262 J exactly.
Formula
Wh = BTU × 0.2930710701722
or Wh = BTU ÷ 3.412141633128
Derivation from SI units:
- 1 BTU_IT = 1055.05585262 J (exact)
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 BTU = 1055.05585262 J ÷ 3600 J per Wh = 0.2930710701722 Wh
Both units are defined exactly, so the factor is exact. BTU definition: British thermal unit; Watt-hour definition: watt-hour.
Worked examples
- A reading of 3412 BTU converts to 999.9584914 Wh.
3412 BTU × 0.2930710702 = 999.9584914 Wh - A value of 24000 BTU is 7033.705684 Wh.
24000 BTU × 0.2930710702 = 7033.705684 Wh
BTU to Watt-hour conversion table
| BTU | Watt-hours (Wh) |
|---|---|
| 1 BTU | 0.2930710702 Wh |
| 100 BTU | 29.30710702 Wh |
| 1000 BTU | 293.0710702 Wh |
| 3412 BTU | 999.9584914 Wh |
| 5000 BTU | 1465.355351 Wh |
| 10000 BTU | 2930.710702 Wh |
| 12000 BTU | 3516.852842 Wh |
| 24000 BTU | 7033.705684 Wh |
| 50000 BTU | 14653.55351 Wh |
| 100000 BTU | 29307.10702 Wh |
| 1000000 BTU | 293071.0702 Wh |
Where it's used
BTU are used for furnace, boiler and fuel ratings in the US, while watt-hours appear in battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank). Both measure energy, work and heat, so the conversion is a fixed factor.
BTU to other energy units
| Conversion | 1 BTU equals |
|---|---|
| BTU to joule | 1055.055853 J |
| BTU to kilojoule | 1.055055853 kJ |
| BTU to megajoule | 0.001055055853 MJ |
| BTU to calorie | 252.1644007 cal |
| BTU to kilocalorie | 0.2521644007 kcal |
| BTU to watt-hour | 0.2930710702 Wh |
| BTU to kilowatt-hour | 0.0002930710702 kWh |
| BTU to therm | 0.00001000238767 thm |
| BTU to electronvolt | 6.585140678 × 10²¹ eV |
| BTU to foot-pound | 778.1692623 ft·lbf |
| BTU to erg | 10550558530 erg |
Frequently asked questions
How many watt-hours are in 1 British thermal unit?
1 BTU = 0.2930710702 Wh.
How do I convert British thermal units to watt-hours?
Multiply the value in BTU by 0.2930710702, or divide it by 3.412141633. For example, 15 BTU × 0.2930710702 = 4.396066053 Wh.
Is the BTU to Wh conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "British thermal unit_IT (Btu_IT)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "watt hour (W·h)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert BTU to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/btu-to-watt-hours/
IEEE
Scientific Converters, "Convert BTU to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/btu-to-watt-hours/