⚡ Energy converter

BTU to Kilojoule Converter

Convert BTU (BTU) to kilojoules (kJ) instantly with the exact formula, a conversion table and chart.

BTU

Results

Kilojoules
1.05505585262 kJ
Same value in every unit

📊 BTU to Kilojoule chart

BTU to Kilojoule — plotted against btu (btu).

How to convert BTU to kilojoules

To convert BTU to kilojoules, multiply by 1.05505585262. Energy conversions connect nutrition, electricity bills, heating systems and physics.

kJ = BTU × 1.05505585262 BTU = kJ ÷ 1.05505585262
BTU to Kilojoule conversion – BTU to kJ formula illustration
BTU (BTU) → Kilojoule (kJ) at a glance.

BTU to Kilojoule conversion table

BTU (BTU)Kilojoule (kJ)
0.1 BTU0.105505585262 kJ
0.5 BTU0.52752792631 kJ
1 BTU1.05505585262 kJ
2 BTU2.11011170524 kJ
3 BTU3.16516755786 kJ
4 BTU4.22022341048 kJ
5 BTU5.2752792631 kJ
10 BTU10.5505585262 kJ
20 BTU21.1011170524 kJ
25 BTU26.3763963155 kJ
50 BTU52.752792631 kJ
100 BTU105.505585262 kJ
500 BTU527.52792631 kJ
1,000 BTU1,055.05585262 kJ

About the units

BTU (BTU)

The International Table British thermal unit is about 1,055.06 joules, used for HVAC and heating.

Kilojoule (kJ)

A kilojoule is 1,000 joules and appears on food labels in many countries.

How to use this converter

  1. Type the number of BTU (BTU) in the input box.
  2. The result in kilojoules appears instantly — no button needed.
  3. See the same value in every other energy unit just below.
  4. Use “Swap units” to convert kilojoules back to BTU.

Tips for better results

  • Double-check which system a unit belongs to (for example US vs UK gallons).
  • Use the swap button to convert in the opposite direction instantly.
  • Bookmark the conversions you use most — each pair has its own page.

Frequently asked questions

How many kilojoules are in one btu?

One btu equals 1.05505585262 kilojoules. 1.05505585262 is the exact factor used by this converter.

How do I convert BTU to kilojoules?

Multiply the value in BTU by 1.05505585262. To go the other way, multiply kilojoules by 0.947817120313.

What is 10 BTU in kJ?

10 BTU = 10.5505585262 kJ. Also, 5 BTU = 5.2752792631 kJ and 100 BTU = 105.505585262 kJ.

What is the difference between a btu and a kilojoule?

The International Table British thermal unit is about 1,055.06 joules, used for HVAC and heating. A kilojoule is 1,000 joules and appears on food labels in many countries.

Is this tool free and private?

Yes — the BTU to Kilojoule is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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