Thermochemical calories to British thermal units (IT)
1 cal ≈ 0.003966 BTU. Edit either value to convert instantly.
Conversion formula
BTU = cal × (4.184) × (50,000,000 / 5.2752792631 × 10¹⁰)1 cal ≈ 0.00396567 BTU
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
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
Conversion table
| cal | BTU |
|---|---|
| ≈ 0.00396567 | |
| ≈ 0.00793133 | |
| ≈ 0.0198283 | |
| ≈ 0.0396567 | |
| ≈ 0.059485 | |
| ≈ 0.0793133 | |
| ≈ 0.0991417 | |
| ≈ 0.11897 | |
| ≈ 0.158627 | |
| ≈ 0.178455 |
| cal | BTU |
|---|---|
| ≈ 0.198283 | |
| ≈ 0.23794 | |
| ≈ 0.277597 | |
| ≈ 0.317253 | |
| ≈ 0.35691 | |
| ≈ 0.396567 | |
| ≈ 0.59485 | |
| ≈ 0.634507 | |
| ≈ 0.674163 | |
| ≈ 0.71382 |
Frequently asked questions
How many British thermal units (IT) are in 1 thermochemical calorie?
1 cal ≈ 0.003966 BTU. BTU = cal × (4.184) × (50,000,000 / 5.2752792631 × 10¹⁰)
How do I convert cal to BTU?
BTU = cal × (4.184) × (50,000,000 / 5.2752792631 × 10¹⁰)
Is 1 thermochemical calorie bigger than 1 British thermal unit (IT)?
1 cal ≈ 0.003966 BTU.
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