Calories to Therms Converter
Convert calories (thermochemical) (cal) to therms (100,000 Btu) (thm), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 cal = 3.96566683139e-8 thm
- 1 × 3.96566683139e-8 = 3.96566683139e-8 thm
How to convert calories to therms
1 cal = 3.96566683139 × 10⁻⁸ thm, so multiply by 3.96566683139 to go from calories (thermochemical) to therms (100,000 Btu). Going the other way, 1 thm = 25,216,440.0722 cal.
thm = cal × 3.96566683139 cal = thm × 25,216,440.0722
Worked example:
1 cal = 3.96566683139e-8 thm 5 × 3.96566683139e-8 = 1.9828334157e-7 thm
Calories to therms table
| Calories | Therms |
|---|---|
| 1 cal | 3.96566683139 × 10⁻⁸ thm |
| 2 cal | 7.93133366278 × 10⁻⁸ thm |
| 3 cal | 1.18970004942 × 10⁻⁷ thm |
| 4 cal | 1.58626673256 × 10⁻⁷ thm |
| 5 cal | 1.9828334157 × 10⁻⁷ thm |
| 6 cal | 2.37940009883 × 10⁻⁷ thm |
| 7 cal | 2.77596678197 × 10⁻⁷ thm |
| 8 cal | 3.17253346511 × 10⁻⁷ thm |
| 9 cal | 3.56910014825 × 10⁻⁷ thm |
| 10 cal | 3.96566683139 × 10⁻⁷ thm |
| 15 cal | 5.94850024709 × 10⁻⁷ thm |
| 20 cal | 7.93133366278 × 10⁻⁷ thm |
| 25 cal | 9.91416707848 × 10⁻⁷ thm |
| 30 cal | 1.18970004942 × 10⁻⁶ thm |
| 40 cal | 1.58626673256 × 10⁻⁶ thm |
| 50 cal | 1.9828334157 × 10⁻⁶ thm |
| 75 cal | 2.97425012354 × 10⁻⁶ thm |
| 100 cal | 3.96566683139 × 10⁻⁶ thm |
| 250 cal | 9.91416707848 × 10⁻⁶ thm |
| 500 cal | 1.9828334157 × 10⁻⁵ thm |
| 1000 cal | 3.96566683139 × 10⁻⁵ thm |
About the units
- Calories (cal)
- Calories (thermochemical), a specialised unit. The thermochemical calorie, 4.184 J, used on US food labels as 1 Calorie = 1 kilocalorie. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.
- Therms (thm)
- Therms (100,000 Btu), a US customary unit. The EC/IT therm; the US therm is 105,480,400 J, 0.02% smaller. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.
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