Gas meters measure volume, but you pay for energy. Utilities multiply CCF by a “therm factor” printed on the bill, usually about 1.03–1.05, because pipeline gas averages about 1,037 BTU per cubic foot.
How to use the CCF to Therms Calculator
- Gas used
- Heat content — Use the therm factor on your bill × 1,000 if given.
- Every result field is editable: type into Energy and Gas used plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
CCF are converted to cubic feet, multiplied by the heat content to get BTU, and divided by 100,000 BTU per therm.
Inputs explained
| Field | What to enter |
|---|---|
| Gas used | In CCF |
| Heat content | In BTU/ft³. Use the therm factor on your bill × 1,000 if given. |
What each result means
- Energy = [Gas used] × 100 × [Heat content] ÷ 100000
- In kWh = [Gas used] × 100 × [Heat content] × 0.29307107
- In MMBtu (dekatherms) = [Gas used] × 100 × [Heat content] ÷ 1e6
Example values
How the main result changes when Gas used changes and everything else stays at the example values above:
| Gas used (CCF) | Energy (therms) |
|---|---|
| 25 | 25.925 |
| 37.5 | 38.888 |
| 50 | 51.85 |
| 62.5 | 64.813 |
| 75 | 77.775 |
| 100 | 103.7 |
Formula
therms = CCF × heat content (BTU/ft³) × 100 ÷ 100,000Worked example
Inputs — Gas used: 50 CCF; Heat content: 1,037 BTU/ft³.
Results — Energy = 51.85 therms; In kWh = 1,519,573.5 kWh; In MMBtu (dekatherms) = 5.185 MMBtu.
Frequently asked questions
How many therms in 1 CCF?
About 1.037 therms at 1,037 BTU/ft³.
What is a therm?
100,000 BTU, about 29.3 kWh.
What formula does the CCF to Therms Calculator use?
therms = CCF × heat content (BTU/ft³) × 100 ÷ 100,000.