Joule to British Thermal Unit Converter
Energy · unit-converter
Convert Joule to British Thermal Unit with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Joule (j)
To: British Thermal Unit (btu)
About Joule
The joule is the SI unit of energy. All other units here are converted through fixed joule equivalents.
About British Thermal Unit
The British thermal unit used here is the IT BTU: ≈ 1,055.056 J. It appears in HVAC, heating equipment, and US engineering data.
How to convert joules to british thermal units
1 joule is equal to 0.00094781712031 british thermal unit when both are expressed in joule-equivalents:
1 j = (1 J ÷ 1,055.05585262 J) btu = 0.00094781712031 btu
Each joule is defined as 1 J and each british thermal unit as 1,055.05585262 J in this tool, so one j equals 1 ÷ 1,055.05585262 btu = 0.00094781712031 btu.
Let d(j) be the numeric amount in Joule (j), and d(btu) the amount in British Thermal Unit (btu). Then:
d(btu) = d(j) × (1 / 1,055.05585262)
Equivalently, divide by how many j fit into one btu (joules per btu divided by joules per j):
d(btu) = d(j) ÷ 1055.05585262
Or: british thermal unit = joule ÷ 1055.05585262
Examples
Example #1: Convert 1 j to british thermal unit
1 j = 1 j × (1/1,055.05585262) btu = 0.0009478171 btu
1 j = 1 j ÷ 1055.05585262 = 0.0009478171 btu
Example #2: Convert 10 j to british thermal unit
10 j = 10 j × (1/1,055.05585262) btu = 0.0094781712 btu
10 j = 10 j ÷ 1055.05585262 = 0.0094781712 btu
Summary
To convert Joule to British Thermal Unit, multiply the value in j by the ratio of joules per j divided by joules per btu. Equivalently: value_btu = value_j × (1 / 1055.05585262). Numerically, 1 j equals 0.0009478171203133172 btu.
Relationship context
You are converting between SI energy (joules) (Joules) and US / imperial engineering units (BTU, therm, ft·lb) (British Thermal Units). All values are mapped through joules first. The numeric factor is 9.478171e-4.
Conversion tables
| Joule (j) | British Thermal Unit (btu) |
|---|---|
| 0.1 | 0.0000947817 |
| 1 | 0.0009478171 |
| 2 | 0.0018956342 |
| 3 | 0.0028434514 |
| 4 | 0.0037912685 |
| 5 | 0.0047390856 |
| 6 | 0.0056869027 |
| 7 | 0.0066347198 |
| 8 | 0.007582537 |
| 9 | 0.0085303541 |
| Joule (j) | British Thermal Unit (btu) |
|---|---|
| 10 | 0.0094781712 |
| 20 | 0.0189563424 |
| 30 | 0.0284345136 |
| 40 | 0.0379126848 |
| 50 | 0.047390856 |
| 60 | 0.0568690272 |
| 70 | 0.0663471984 |
| 80 | 0.0758253696 |
| 90 | 0.0853035408 |
| 100 | 0.094781712 |