Joule to BTU (J to BTU)
Result
0.00094781712 BTU
Formula
BTU = J × 0.00094781712
1 J = 0.00094781712 BTU, and 1 BTU = 1,055.055853 J.
The joule is the SI unit of energy. The calorie used here is the thermochemical calorie, exactly 4.184 J; a kilowatt-hour is exactly 3.6 MJ; the BTU is the International Table BTU (1,055.05585262 J).
Worked examples
- 1 J × 0.00094781712 = 0.00094781712 BTU
- 10 J × 0.00094781712 = 0.0094781712 BTU
- 100 J × 0.00094781712 = 0.094781712 BTU
Common mistakes
- Food "Calories" (capital C) are kilocalories: a 250 Calorie snack contains 250 kcal, or 1,046 kJ.
- kW is power and kWh is energy: a 2 kW heater running for 3 hours uses 6 kWh.
- The International Table calorie (4.1868 J) is slightly larger than the thermochemical calorie (4.184 J); engineering steam tables use the former.
Joule to BTU table
| Joule (J) | BTU (BTU) |
|---|---|
| 1 | 0.00094781712 |
| 2 | 0.0018956342 |
| 5 | 0.0047390856 |
| 10 | 0.0094781712 |
| 20 | 0.018956342 |
| 50 | 0.047390856 |
| 100 | 0.094781712 |
| 1,000 | 0.94781712 |
The units
- Joule (J)
- A unit of energy.
- BTU (BTU)
- British thermal unit (International Table): 1,055.05585262 J — roughly the heat to warm one pound of water by 1 °F.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- The International System of Units (SI Brochure), 9th edition — BIPM
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy