Use this free online calculator to convert Btu to Calorie [I T ] instantly. This energy conversion tool provides accurate results for all your measurement needs.

Quick Reference

1 Btu = 251.9958 Calorie [I T ]

1 Calorie [I T ] = 3.968e-3 Btu

Btu to Calorie [I T ] Conversion Formula

To convert Btu to Calorie [I T ], multiply by 251.9958.

Calorie [I T ] = Btu × 251.9958

Btu = Calorie [I T ] × 3.968e-3

To convert Calorie [I T ] back to Btu, divide by 251.9958 (or multiply by 3.968e-3).

About These Units

About Btu

The Btu is a unit of heat energy defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. In America the British thermal unit is sometimes called the heat unit. In defining the Btu, it is necessary to specify the temperature of the water; thus there have been several definitions over the years. However, one Btu is equal to about 251.996 (small) calories, or 0.251 996 of the (kilo-)calories counted by dieters. Using the current definition of the calorie (the IT calorie), one Btu equals approximately 778.169 foot pounds, 1.055 056 kilojoules or 0.293 071 watt hour. The symbol BThU has also been used, especially in Britain.

About Calorie [I T ]

The calorie [I.T.] is a unit of energy used to measure work, heat, or power in various scientific and engineering contexts.

Btu to Calorie [I T ] Conversion Table

Btu	Calorie [I T ]	Calorie [I T ]	Btu
0.1	25.1996	0.1	3.968e-4
0.5	125.9979	0.5	1.984e-3
1	251.9958	1	3.968e-3
2	503.9915	2	7.937e-3
5	1259.98	5	0.019842
10	2519.96	10	0.039683
20	5039.92	20	0.079366
25	6299.89	25	0.099208
50	12599.79	50	0.198416
100	25199.58	100	0.396832
250	62998.94	250	0.992080
500	125997.89	500	1.9842
1000	251995.77	1000	3.9683

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