British thermal units (IT) to Thermochemical calories
1 BTU ≈ 252.2 cal. Edit either value to convert instantly.
Conversion formula
cal = BTU × (1,055.05585262) × (125 / 523)1 BTU ≈ 252.164 cal
British thermal unit (IT) (BTU)
British thermal unit (IT) is a unit of energy: 1 BTU = 1,055.05585262 J. Uses the International Table definition (IT), not the thermochemical BTU.
Source: NBSIR 81-2401, Appendix A3.2: International Table British thermal unit
thermochemical calorie (cal)
Thermochemical calorie is a unit of energy: 1 cal = 4.184 J. The thermochemical definition is used; 1,000 cal = 1 kcal.
Source: NIST SP 811, Appendix B.9: conversion factors by quantity
Conversion table
| BTU | cal |
|---|---|
| ≈ 252.164 | |
| ≈ 504.329 | |
| ≈ 1,260.82 | |
| ≈ 2,521.64 | |
| ≈ 3,782.47 | |
| ≈ 5,043.29 | |
| ≈ 6,304.11 | |
| ≈ 7,564.93 | |
| ≈ 10,086.6 | |
| ≈ 11,347.4 |
| BTU | cal |
|---|---|
| ≈ 12,608.2 | |
| ≈ 15,129.9 | |
| ≈ 17,651.5 | |
| ≈ 20,173.2 | |
| ≈ 22,694.8 | |
| ≈ 25,216.4 | |
| ≈ 37,824.7 | |
| ≈ 40,346.3 | |
| ≈ 42,867.9 | |
| ≈ 45,389.6 |
Frequently asked questions
How many thermochemical calories are in 1 British thermal unit (IT)?
1 BTU ≈ 252.2 cal. cal = BTU × (1,055.05585262) × (125 / 523)
How do I convert BTU to cal?
cal = BTU × (1,055.05585262) × (125 / 523)
Is 1 British thermal unit (IT) bigger than 1 thermochemical calorie?
1 BTU ≈ 252.2 cal.
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