calories to Btu converter

1 calorie equals 0.0039656668 BTUs. Conversions use Btu = cal × 0.003966

cal → 0.0039656668 Btu

Btu = cal × 0.003966

Converter

Worked examples

1 cal = 0.0039656668 Btu
2 cal = 0.0079313337 Btu
5 cal = 0.01982833 Btu
10 cal = 0.03965667 Btu
100 cal = 0.39656668 Btu

calories to BTUs conversion table

cal	Btu	Arithmetic
1 cal	0.0039656668 Btu	× 0.003966
2 cal	0.0079313337 Btu	× 0.003966
3 cal	0.011897 Btu	× 0.003966
4 cal	0.01586267 Btu	× 0.003966
5 cal	0.01982833 Btu	× 0.003966
6 cal	0.023794 Btu	× 0.003966
8 cal	0.03172533 Btu	× 0.003966
10 cal	0.03965667 Btu	× 0.003966
12 cal	0.047588 Btu	× 0.003966
15 cal	0.059485 Btu	× 0.003966
20 cal	0.07931334 Btu	× 0.003966
25 cal	0.09914167 Btu	× 0.003966
30 cal	0.11897 Btu	× 0.003966
40 cal	0.15862667 Btu	× 0.003966
50 cal	0.19828334 Btu	× 0.003966
60 cal	0.23794001 Btu	× 0.003966
70 cal	0.27759668 Btu	× 0.003966
80 cal	0.31725335 Btu	× 0.003966
90 cal	0.35691001 Btu	× 0.003966
100 cal	0.39656668 Btu	× 0.003966

How to convert cal to Btu

Take your value in calories.
Multiply by 0.003966
That is your answer in BTUs — no rounding needed until you choose a display precision.

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Questions

How many BTUs in 1 calorie?

Exactly 0.0039656668 Btu. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert cal to Btu?

Multiply the calories figure by 0.003966 — or use the converter above, which updates as you type.

Is cal to Btu the same as Btu to cal?

No — they are inverses. One cal is 0.0039656668 Btu, while one Btu is 252.164 cal.

What is 1 cal in Btu?

1 cal = 0.0039656668 Btu (see the value page for the full arithmetic).