At One Place

British thermal units to calories

1 British thermal unit in calories
1 BTU = 252.1644 cal
cal = BTU × 252.1644007

To convert British thermal units to calories, multiply by 252.1644007. The table below gives the values people look up most often, and the converter works for any number.

British thermal units to calories table

Common British thermal unit values converted to calories.
British thermal units Calories
1 BTU 252.1644
2 BTU 504.3288
3 BTU 756.4932
4 BTU 1,008.6576
5 BTU 1,260.822
10 BTU 2,521.644
15 BTU 3,782.466
20 BTU 5,043.288
25 BTU 6,304.11
30 BTU 7,564.932
40 BTU 10,086.576
50 BTU 12,608.22
75 BTU 18,912.33
100 BTU 25,216.44
250 BTU 63,041.1
500 BTU 126,082.2
1,000 BTU 252,164.4

How the conversion works

The relationship is cal = BTU × 252.1644007. Both units measure energy, so the conversion is a fixed factor that never changes.

Calorie: Thermochemical (small) calorie.

Common questions

How many calories are in one British thermal unit?
One British thermal unit equals 252.1644 calories. cal = BTU × 252.1644007.
How do you convert British thermal units to calories?
Use cal = BTU × 252.1644007. So 10 BTU is 2,521.644 cal.
How many British thermal units are in one calorie?
One calorie equals 0.0039657 British thermal units, which is the reverse of the conversion above.
Is there more than one kind of calorie?
Thermochemical (small) calorie.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked