How many British thermal units are in one kilojoule?

There are 0.94781712 British thermal units in 1 kilojoule.

How do you convert British thermal units to kilojoules?

Multiply the number of British thermal units by 1.05505585 — or use the formula kJ = BTU × 1.05505585.

What is 6 British thermal units in kilojoules?

6 British thermal units is 6.33033512 kilojoules. 6 × 1.05505585 = 6.33033512 kilojoules.

British Thermal Units to Kilojoules Converter

Convert British thermal units to kilojoules instantly with this free British thermal units to kilojoules converter. Enter any value to get an accurate energy conversion, plus the formula, the conversion factor and a full reference table.

What is 1 British thermal unit in kilojoules?

1 British thermal unit is equal to 1.05505585 kilojoules.

1 × 1.05505585 = 1.05505585 kilojoules

Amount

Result1.055055853

1 British thermal unit = 1.055055853 kilojoules

British thermal units to Kilojoules formula

kJ = BTU × 1.05505585

The British thermal units to kilojoules conversion factor is 1.05505585262 (rounded). 1 British thermal unit = 1.05505585262 kilojoules, and 1 kilojoule = 0.947817120313 British thermal units.

Worked examples

2 British thermal units = 2.11011171 kilojoules — 2 × 1.05505585 = 2.11011171 kilojoules
6 British thermal units = 6.33033512 kilojoules — 6 × 1.05505585 = 6.33033512 kilojoules
10 British thermal units = 10.5505585 kilojoules — 10 × 1.05505585 = 10.5505585 kilojoules

British thermal units to Kilojoules conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

British thermal units to kilojoules conversion table
British thermal units (BTU)	Kilojoules (kJ)
1 BTU	1.0550559 kJ
2 BTU	2.1101117 kJ
3 BTU	3.1651676 kJ
4 BTU	4.2202234 kJ
5 BTU	5.2752793 kJ
6 BTU	6.3303351 kJ
7 BTU	7.385391 kJ
8 BTU	8.4404468 kJ
9 BTU	9.4955027 kJ
10 BTU	10.550559 kJ
12 BTU	12.66067 kJ
15 BTU	15.825838 kJ
20 BTU	21.101117 kJ
25 BTU	26.376396 kJ
30 BTU	31.651676 kJ
50 BTU	52.752793 kJ
75 BTU	79.129189 kJ
100 BTU	105.50559 kJ
500 BTU	527.52793 kJ
1,000 BTU	1,055.0559 kJ

When you need to convert British thermal units to kilojoules

Comparing food energy labelled in calories with labels in kilojoules.
Reading utility bills and appliance ratings that mix kWh, joules and BTU.

Common mistakes to avoid

Dividing when you should multiply. Because 1 British thermal unit = 1.05506 kilojoules, the answer should be larger than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.

How these units are defined

British thermal unit (BTU): The heat needed to raise one pound of water by 1 °F; used for HVAC in the US. The accepted value is a measured or conventional figure rather than an exact definition, so the factor shown is rounded.
Kilojoule (kJ): 1,000 joules; food energy labelling in Australia and New Zealand. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 British thermal unit in kilojoules?: 1 British thermal unit is equal to 1.05505585 kilojoules.
How many British thermal units are in one kilojoule?: There are 0.94781712 British thermal units in 1 kilojoule.
How do you convert British thermal units to kilojoules?: Multiply the number of British thermal units by 1.05505585 — or use the formula kJ = BTU × 1.05505585.
What is 6 British thermal units in kilojoules?: 6 British thermal units is 6.33033512 kilojoules. 6 × 1.05505585 = 6.33033512 kilojoules.
Is the British thermal units to kilojoules conversion exact?: The factor 1.05505585262 is a rounded value because at least one of these units is defined by measurement rather than by an exact definition.