BTU to Kilojoules

Convert BTU to kJ instantly — with a table, common energy values, and a live calculator.

1 BTU equals 1.06 kJ.

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Result (kJ)1.06 kJ

BTU to kJ table

BTUkJ
1 BTU1.06 kJ
2 BTU2.11 kJ
3 BTU3.17 kJ
5 BTU5.28 kJ
10 BTU10.55 kJ
15 BTU15.83 kJ
20 BTU21.1 kJ
25 BTU26.38 kJ
30 BTU31.65 kJ
40 BTU42.2 kJ
50 BTU52.75 kJ
60 BTU63.3 kJ
75 BTU79.13 kJ
90 BTU94.96 kJ
100 BTU105.51 kJ
120 BTU126.61 kJ
150 BTU158.26 kJ
200 BTU211.01 kJ
250 BTU263.77 kJ
300 BTU316.52 kJ
400 BTU422.02 kJ
500 BTU527.53 kJ

kJ to BTU (reverse)

kJBTU
1 kJ0.948 BTU
2 kJ1.9 BTU
3 kJ2.84 BTU
5 kJ4.74 BTU
10 kJ9.48 BTU
15 kJ14.22 BTU
20 kJ18.96 BTU
25 kJ23.7 BTU
30 kJ28.43 BTU
40 kJ37.91 BTU
50 kJ47.39 BTU
60 kJ56.87 BTU
75 kJ71.09 BTU
90 kJ85.3 BTU
100 kJ94.78 BTU
120 kJ113.74 BTU
150 kJ142.17 BTU
200 kJ189.56 BTU
250 kJ236.95 BTU
300 kJ284.34 BTU
400 kJ379.13 BTU
500 kJ473.91 BTU

Common energy values

BTUkJ
5 BTU5.28 kJ
10 BTU10.55 kJ
25 BTU26.38 kJ
50 BTU52.75 kJ
75 BTU79.13 kJ
100 BTU105.51 kJ
120 BTU126.61 kJ
150 BTU158.26 kJ
200 BTU211.01 kJ
300 BTU316.52 kJ
400 BTU422.02 kJ
500 BTU527.53 kJ

How it scales

2653791060255075100BTU

1 kWh in other units

860kcal3.6MJ3412BTU1000Wh

The ratio at a glance

1 BTU1.06 kJ

Joules, kWh, and calories — the key energy units

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill and equals 3.6 MJ. With calories there are two sizes that must not be confused: the kilocalorie (kcal) on nutrition labels equals exactly 4184 J (4.184 kJ), while the small calorie (cal) is only 4.184 J — they differ by a factor of 1000. The BTU (British thermal unit) equals 1055.06 J and is used in heating and air-conditioning.

Energy conversions are exact and rest on fixed factors — for more unit pairs, use our energy conversion hub.

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Frequently asked questions

How many kJ are in 1 BTU?

1 BTU equals 1.06 kJ.

How many kJ are in 2 BTU?

2 BTU equal 2.11 kJ.

How do I convert BTU to kJ?

Multiply the energy in BTU by 1.06 to get kJ.

Is the BTU-to-kJ conversion exact?

Yes. Energy conversions are exact; the values here are only rounded to two decimal places.

What are these energy units used for?

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill, kilocalories (kcal) appear on food labels, and the BTU (British thermal unit) is used in heating and air-conditioning.

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