Convert kilojoules to BTU

1 kJ=0.9478BTU

Use the converter below to change any kilojoules value into BTU instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.94782

Conversion formula

Forward

BTU = kilojoules × 0.9478

Reverse

kilojoules = BTU × 1.05506

Example: 10 kJ × 0.9478 = 9.47817 BTU.

About both units

From

Kilojoule

The kilojoule equals 1000 joules. Used on European nutrition labels (required by EU law alongside kcal), for mechanical work specifications, and some engineering contexts. A 100 g chocolate bar contains about 2100 kJ.

Real-world: 100 g chocolate: ~2100 kJ. EU daily intake (adult): ~8400 kJ. Tesla Model 3 battery: ~270 MJ = 270,000 kJ.

Read full kilojoule reference →

British Thermal Unit

BTU

The British Thermal Unit equals approximately 1055 joules — the energy to raise 1 pound of water by 1 °F. Used for HVAC, heating, and air-conditioning capacity in the US. A 9000 BTU/h AC is a small room unit.

Real-world: Window AC: 5000–12,000 BTU/h. Central AC: 24,000–60,000 BTU/h. Home furnace: 60,000–100,000 BTU/h.

Read full british thermal unit reference →

Kilojoule to British Thermal Unit conversion table

Common kilojoules to BTU values for quick reference.

Kilojoule (kJ)	British Thermal Unit (BTU)
1 kJ	0.9478 BTU
10 kJ	9.47817 BTU
100 kJ	94.7817 BTU
500 kJ	473.909 BTU
1,000 kJ	947.817 BTU
5,000 kJ	4,739.09 BTU
10,000 kJ	9,478.17 BTU
50,000 kJ	47,390.86 BTU
100,000 kJ	94,781.71 BTU
500,000 kJ	473,908.56 BTU

Tips & common mistakes

Quick tips

1 kJ = 1000 J = 0.239 kcal.
EU nutrition labels must show both kJ and kcal.
For quick conversion: kcal × 4.2 = kJ.

Avoid these

Assuming European labels use kcal only — they use both kJ and kcal.
Confusing kJ with kW (power).
Using kcal when kJ is requested in scientific context.

Frequently asked questions

How many BTU in a kilojoule?

One kilojoule equals 0.9478 BTU.

How do I convert kilojoules to BTU?

Multiply the kilojoule value by 0.9478 to get the equivalent in BTU.

What is 100 kilojoules in BTU?

100 kilojoules equals 94.7817 BTU.

Is a kilojoule bigger than a british thermal unit?

No. 1 kilojoule equals 0.9478 BTU, so one kilojoule is smaller.

How to convert kilojoules to BTU without a calculator?

Multiply by 0.95 for a quick estimate; use a calculator for precise results.

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