British Thermal Unit to Kilojoule Converter
Energy · unit-converter
Convert British Thermal Unit to Kilojoule 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: Kilojoule (kj)
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 Kilojoule
One kilojoule is 1,000 J. Scientific and engineering contexts often use kJ alongside joules.
How to convert british thermal units to kilojoules
1 british thermal unit is equal to 1.05505585262 kilojoule when both are expressed in joule-equivalents:
1 btu = (1,055.05585262 J ÷ 1,000 J) kj = 1.05505585262 kj
Each british thermal unit is defined as 1,055.05585262 J and each kilojoule as 1,000 J in this tool, so one btu equals 1,055.05585262 ÷ 1,000 kj = 1.05505585262 kj.
Let d(btu) be the numeric amount in British Thermal Unit (btu), and d(kj) the amount in Kilojoule (kj). Then:
d(kj) = d(btu) × (1,055.05585262 / 1,000)
Equivalently, divide by how many btu fit into one kj (joules per kj divided by joules per btu):
d(kj) = d(btu) ÷ 0.94781712031332
Or: kilojoule = british thermal unit ÷ 0.94781712031332
Examples
Example #1: Convert 1 btu to kilojoule
1 btu = 1 btu × (1,055.05585262/1,000) kj = 1.0550558526 kj
1 btu = 1 btu ÷ 0.94781712031332 = 1.0550558526 kj
Example #2: Convert 10 btu to kilojoule
10 btu = 10 btu × (1,055.05585262/1,000) kj = 10.5505585262 kj
10 btu = 10 btu ÷ 0.94781712031332 = 10.5505585262 kj
Summary
To convert British Thermal Unit to Kilojoule, multiply the value in btu by the ratio of joules per btu divided by joules per kj. Equivalently: value_kj = value_btu × (1055.05585262 / 1000). Numerically, 1 btu equals 1.05505585262 kj.
Relationship context
You are converting between US / imperial engineering units (BTU, therm, ft·lb) (British Thermal Units) and SI energy (joules) (Kilojoules). All values are mapped through joules first. The numeric factor is 1.055056e+0.
Conversion tables
| British Thermal Unit (btu) | Kilojoule (kj) |
|---|---|
| 0.1 | 0.1055055853 |
| 1 | 1.0550558526 |
| 2 | 2.1101117052 |
| 3 | 3.1651675579 |
| 4 | 4.2202234105 |
| 5 | 5.2752792631 |
| 6 | 6.3303351157 |
| 7 | 7.3853909683 |
| 8 | 8.440446821 |
| 9 | 9.4955026736 |
| British Thermal Unit (btu) | Kilojoule (kj) |
|---|---|
| 10 | 10.5505585262 |
| 20 | 21.1011170524 |
| 30 | 31.6516755786 |
| 40 | 42.2022341048 |
| 50 | 52.752792631 |
| 60 | 63.3033511572 |
| 70 | 73.8539096834 |
| 80 | 84.4044682096 |
| 90 | 94.9550267358 |
| 100 | 105.505585262 |