BTU to kJ
Convert BTU to kJ. Enter a value and view the calculation method, examples and conversion table.
Energy converter
BTU to kJ formula
The calculator converts the input to the category's reference unit, then divides by the target unit's factor.
Result = input × source factor ÷ target factor
1 × (1,055.05585262 ÷ 1,000) ≈ 1.05505585
Worked example: 1 British thermal units ≈ 1.05505585 Kilojoules
Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
BTU to kJ conversion table
| British thermal units | Kilojoules |
|---|---|
| 1 British thermal units | ≈ 1.05505585 Kilojoules |
| 2 British thermal units | ≈ 2.11011171 Kilojoules |
| 5 British thermal units | ≈ 5.27527926 Kilojoules |
| 10 British thermal units | ≈ 10.55055853 Kilojoules |
| 20 British thermal units | ≈ 21.10111705 Kilojoules |
| 50 British thermal units | ≈ 52.75279263 Kilojoules |
| 100 British thermal units | ≈ 105.50558526 Kilojoules |
| 250 British thermal units | ≈ 263.76396316 Kilojoules |
| 500 British thermal units | 527.52792631 Kilojoules |
| 1,000 British thermal units | 1,055.05585262 Kilojoules |
Definitions and assumptions
Energy factors are expressed relative to joules. This tool uses the thermochemical calorie (4.184 J) and the International Table British thermal unit. Energy and torque can share dimensions but describe different physical quantities.
How to use this calculator
- Enter the value you want to convert.
- Choose the source and target units, then adjust the display precision if needed.
- Read the result. Select Convert to open a page for this value, or use the table below.
Frequently asked questions
how many kJ is 1 BTU?
1 British thermal units ≈ 1.05505585 Kilojoules. Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
how to convert BTU to kJ?
The calculator converts the input to the category's reference unit, then divides by the target unit's factor. 1 × 1.05505585262 ≈ 1.05505585 Kilojoules. Use the source and target factors shown in the formula. The worked example uses the value on this page, and the table provides other common values.
Are all calories identical?
No. Several historical calorie definitions exist. This tool uses the thermochemical calorie of exactly 4.184 joules; a kilocalorie is 1000 of these calories.
Why is the displayed result rounded?
Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
What input range can I use?
This calculator accepts non-negative values up to 1 trillion, with up to 8 decimal places. It does not calculate signed vectors or calendar date intervals.
Why is a unit unavailable?
A conversion is unavailable when a verified unit definition or a current exchange-rate value has not been configured. The tool does not invent a coefficient.
Sources and methodology
Methods and sources · Content revised
Report a problem