British Thermal Unit to Joule Converter
Energy · unit-converter
Convert British Thermal Unit to Joule 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: British Thermal Unit (btu)
To: Joule (j)
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.
About Joule
The joule is the SI unit of energy. All other units here are converted through fixed joule equivalents.
How to convert british thermal units to joules
1 british thermal unit is equal to 1055.05585262 joule when both are expressed in joule-equivalents:
1 btu = (1,055.05585262 J ÷ 1 J) j = 1055.05585262 j
IT British thermal unit: 1 BTU ≈ 1,055.05585262 J here.
Each british thermal unit is defined as 1,055.05585262 J and each joule as 1 J in this tool, so one btu equals 1,055.05585262 ÷ 1 j = 1055.05585262 j.
Let d(btu) be the numeric amount in British Thermal Unit (btu), and d(j) the amount in Joule (j). Then:
d(j) = d(btu) × (1,055.05585262 / 1)
Equivalently, divide by how many btu fit into one j (joules per j divided by joules per btu):
d(j) = d(btu) ÷ 0.00094781712031
Or: joule = british thermal unit ÷ 0.00094781712031
Examples
Example #1: Convert 1 btu to joule
1 btu = 1 btu × (1,055.05585262/1) j = 1055.05585262 j
1 btu = 1 btu ÷ 0.00094781712031 = 1055.05585262 j
Example #2: Convert 10 btu to joule
10 btu = 10 btu × (1,055.05585262/1) j = 10550.5585262 j
10 btu = 10 btu ÷ 0.00094781712031 = 10550.5585262 j
Summary
To convert British Thermal Unit to Joule, multiply the value in btu by the ratio of joules per btu divided by joules per j. Equivalently: value_j = value_btu × (1055.05585262 / 1). Numerically, 1 btu equals 1055.05585262 j.
Relationship context
You are converting between US / imperial engineering units (BTU, therm, ft·lb) (British Thermal Units) and SI energy (joules) (Joules). All values are mapped through joules first. The numeric factor is 1.055056e+3.
Conversion tables
| British Thermal Unit (btu) | Joule (j) |
|---|---|
| 0.1 | 105.505585262 |
| 1 | 1,055.05585262 |
| 2 | 2,110.11170524 |
| 3 | 3,165.16755786 |
| 4 | 4,220.22341048 |
| 5 | 5,275.2792631 |
| 6 | 6,330.33511572 |
| 7 | 7,385.39096834 |
| 8 | 8,440.44682096 |
| 9 | 9,495.50267358 |
| British Thermal Unit (btu) | Joule (j) |
|---|---|
| 10 | 10,550.5585262 |
| 20 | 21,101.1170524 |
| 30 | 31,651.6755786 |
| 40 | 42,202.2341048 |
| 50 | 52,752.792631 |
| 60 | 63,303.3511572 |
| 70 | 73,853.9096834 |
| 80 | 84,404.4682096 |
| 90 | 94,955.0267358 |
| 100 | 105,505.585262 |