Convert Calories per Gram to BTU per Pound (cal/g to BTU/lb)
1 calorie per gram (cal/g) = 1.8 BTU per pound (BTU/lb). 1 BTU/lb = 0.5555555556 cal/g. Example: 15 cal/g = 15 × 1.8 = 27 BTU/lb.
Also searched as calories per gram to BTU/lb, calories per gram in BTU/lb, calories per gram into BTU per pound, cal/g to BTU/lb, cal/g in BTU per pound, cal/g into BTU per pound, calorie per gram to BTU per pound, cal/g to BTU per pound converter and how many BTU per pound in a calorie per gram.
1 cal/g = 1.8 BTU/lb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk calorie per gram to BTU per pound converter to paste a column from Excel.
How to Convert Calorie per Gram to BTU per Pound
- 1 cal/g = 1.8 BTU/lb
- 1 BTU/lb = 0.5555555556 cal/g
- Example: convert 15 cal/g to BTU/lb: 15 cal/g = 15 × 1.8 BTU/lb = 27 BTU/lb
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
BTU/lb = cal/g × 1.8
Derivation from SI units:
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
- 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
- 1 cal/g = 4186.8 J/kg ÷ 2326 J/kg per BTU/lb = 1.8 BTU/lb
Both units are defined exactly, so the factor is exact. Calorie per Gram definition: calorie per gram; BTU per Pound definition: BTU per pound.
Worked examples
- A reading of 80 cal/g converts to 144 BTU/lb.
80 cal/g × 1.8 = 144 BTU/lb - A value of 1000 cal/g is 1800 BTU/lb.
1000 cal/g × 1.8 = 1800 BTU/lb
Calorie per Gram to BTU per Pound conversion table
| Calories per Gram (cal/g) | BTU per Pound (BTU/lb) |
|---|---|
| 1 cal/g | 1.8 BTU/lb |
| 10 cal/g | 18 BTU/lb |
| 50 cal/g | 90 BTU/lb |
| 80 cal/g | 144 BTU/lb |
| 100 cal/g | 180 BTU/lb |
| 540 cal/g | 972 BTU/lb |
| 1000 cal/g | 1800 BTU/lb |
| 4000 cal/g | 7200 BTU/lb |
| 9000 cal/g | 16200 BTU/lb |
| 11000 cal/g | 19800 BTU/lb |
Where it's used
Calories per Gram are used for latent heat problems in CGS units, while BTU per pound appear in US steam tables. Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.
Calorie per Gram to other specific energy units
| Conversion | 1 cal/g equals |
|---|---|
| calorie per gram to BTU per pound | 1.8 BTU/lb |
| calorie per gram to kilojoule per kilogram | 4.1868 kJ/kg |
| calorie per gram to megajoule per kilogram | 0.0041868 MJ/kg |
| calorie per gram to kilocalorie per kilogram | 1 kcal/kg |
| calorie per gram to joule per kilogram | 4186.8 J/kg |
| calorie per gram to kilowatt-hour per kilogram | 0.001163 kWh/kg |
| calorie per gram to joule per gram | 4.1868 J/g |
Frequently asked questions
How many BTU per pound are in 1 calorie per gram?
1 cal/g = 1.8 BTU/lb.
How do I convert calories per gram to BTU per pound?
Multiply the value in cal/g by 1.8. For example, 15 cal/g × 1.8 = 27 BTU/lb.
Is the cal/g to BTU/lb conversion exact?
Yes. Both units are defined exactly, and 1 cal/g is exactly 1.8 BTU/lb.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "calorie_IT per gram".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "British thermal unit_IT per pound".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Calories per Gram to BTU per Pound (cal/g to BTU/lb). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/calories-per-gram-to-btu-per-pound/
IEEE
Scientific Converters, "Convert Calories per Gram to BTU per Pound (cal/g to BTU/lb)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/calories-per-gram-to-btu-per-pound/