What is 1 Kilocalorie (food calorie) in British thermal unit (IT)?

1 Kilocalorie (food calorie) = 3.9657 British thermal unit (IT) (kcal → BTU).

What is the formula to convert Kilocalorie (food calorie) to British thermal unit (IT)?

BTU = kcal × 3.965666831391 Example: 1 kcal = 3.965666831391 BTU.

Yes — the factor is exact by international definition (NIST SP 811 / BIPM SI brochure).

Convert kilocalorie (food calorie) to british thermal unit (it) instantly. The conversion factor below is exact by international definition.

Realtime·energy·metric

Exact

From

kcal

× 3.9657

Result

BTU

3.9657

Precision [auto]

BTU = kcal × 3.965666831391

Inverse: kcal = BTU × 0.252164400722

Worked example: 1 kcal = 3.965666831391 BTU

Kilocalorie (food calorie) (kcal)

Nutrition labels in the US and worldwide as "Calorie".

British thermal unit (IT) (BTU)

Source: International Table BTU.

Kilocalorie (food calorie) (kcal)	British thermal unit (IT) (BTU)
1	3.9657
2	7.9313
5	19.8283
10	39.6567
15	59.485
20	79.3133
25	99.1417
50	198.2833
100	396.5667
250	991.4167
500	1,982.83
750	2,974.25
1,000	3,965.67

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