Convert BTU per Pound to Calories per Gram (BTU/lb to cal/g)
1 BTU per pound (BTU/lb) = 0.5555555556 calories per gram (cal/g). 1 cal/g = 1.8 BTU/lb. Example: 15 BTU/lb = 15 × 0.5555555556 = 8.333333333 cal/g.
Also searched as BTU per pound to cal/g, BTU per pound in cal/g, BTU per pound into calories per gram, BTU/lb to cal/g, BTU/lb in calories per gram, BTU/lb into calorie per gram, BTU per pound to calorie per gram, BTU/lb to calories per gram converter and how many calories per gram in a BTU per pound.
1 BTU/lb = 0.5555555556 cal/g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU per pound to calorie per gram converter to paste a column from Excel.
How to Convert BTU per Pound to Calorie per Gram
- 1 BTU/lb = 0.5555555556 cal/g
- 1 cal/g = 1.8 BTU/lb
- Example: convert 15 BTU/lb to cal/g: 15 BTU/lb = 15 × 0.5555555556 cal/g = 8.333333333 cal/g
Reference conditions. cal/g: International Table calorie (4.1868 J).
Formula
cal/g = BTU/lb × 0.5555555555556
or cal/g = BTU/lb ÷ 1.8
Derivation from SI units:
- 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
- 1 cal_IT/g = 4186.8 J/kg = 1 kcal/kg.
- 1 BTU/lb = 2326 J/kg ÷ 4186.8 J/kg per cal/g = 0.5555555555556 cal/g
Both units are defined exactly, so the factor is exact. BTU per Pound definition: BTU per pound; Calorie per Gram definition: calorie per gram.
Worked examples
- A reading of 144 BTU/lb converts to 80 cal/g.
144 BTU/lb × 0.5555555556 = 80 cal/g - A value of 1000 BTU/lb is 555.5555556 cal/g.
1000 BTU/lb × 0.5555555556 = 555.5555556 cal/g
BTU per Pound to Calorie per Gram conversion table
| BTU per Pound (BTU/lb) | Calories per Gram (cal/g) |
|---|---|
| 1 BTU/lb | 0.5555555556 cal/g |
| 10 BTU/lb | 5.555555556 cal/g |
| 100 BTU/lb | 55.55555556 cal/g |
| 144 BTU/lb | 80 cal/g |
| 500 BTU/lb | 277.7777778 cal/g |
| 970 BTU/lb | 538.8888889 cal/g |
| 1000 BTU/lb | 555.5555556 cal/g |
| 1150 BTU/lb | 638.8888889 cal/g |
| 13000 BTU/lb | 7222.222222 cal/g |
| 19000 BTU/lb | 10555.55556 cal/g |
Where it's used
BTU per Pound are used for US steam tables, while calories per gram appear in latent heat problems in CGS units. Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.
BTU per Pound to other specific energy units
| Conversion | 1 BTU/lb equals |
|---|---|
| BTU per pound to calorie per gram | 0.5555555556 cal/g |
| BTU per pound to kilojoule per kilogram | 2.326 kJ/kg |
| BTU per pound to megajoule per kilogram | 0.002326 MJ/kg |
| BTU per pound to kilocalorie per kilogram | 0.5555555556 kcal/kg |
| BTU per pound to joule per kilogram | 2326 J/kg |
| BTU per pound to kilowatt-hour per kilogram | 0.0006461111111 kWh/kg |
| BTU per pound to joule per gram | 2.326 J/g |
Frequently asked questions
How many calories per gram are in 1 BTU per pound?
1 BTU/lb = 0.5555555556 cal/g.
How do I convert BTU per pound to calories per gram?
Multiply the value in BTU/lb by 0.5555555556, or divide it by 1.8. For example, 15 BTU/lb × 0.5555555556 = 8.333333333 cal/g.
Is the BTU/lb to cal/g conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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, "British thermal unit_IT per pound".
- 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".
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 BTU per Pound to Calories per Gram (BTU/lb to cal/g). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/btu-per-pound-to-calories-per-gram/
IEEE
Scientific Converters, "Convert BTU per Pound to Calories per Gram (BTU/lb to cal/g)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/btu-per-pound-to-calories-per-gram/