This chart shows how therms increase as CCF rises, using the BTU content and correction factor currently shown in the calculator.
A therm equals 100,000 BTU. One CCF equals 100 cubic feet. When BTU content per cubic foot is known, the conversion becomes direct.
Base therms: CCF × (BTU per cubic foot ÷ 1000)
Adjusted therms: Base therms × Correction factor
Estimated cost: Adjusted therms × Cost per therm
- Enter the gas quantity in CCF.
- Type the BTU per cubic foot value from your bill, statement, or utility notice.
- Enter any correction factor used by your provider. Use 1.0000 when no correction is needed.
- Add your cost per therm if you want a bill estimate.
- Choose decimal places and the graph range.
- Press the convert button to see the result above the form.
- Use the download buttons to save the current result as CSV or PDF.
| CCF | BTU per ft³ | Correction | Therms | Rate per Therm | Estimated Cost |
|---|---|---|---|---|---|
| 5.00 | 1,000 | 1.00 | 5.0000 | $1.20 | $6.00 |
| 8.50 | 1,037 | 1.00 | 8.8145 | $1.35 | $11.90 |
| 12.00 | 1,025 | 1.02 | 12.5460 | $1.40 | $17.56 |
| 25.00 | 1,050 | 0.99 | 25.9875 | $1.55 | $40.28 |
1. What does CCF mean?
CCF means one hundred cubic feet of natural gas. Utilities often use it as a billing volume unit before converting that volume into energy units such as therms.
2. What is a therm?
A therm is an energy unit equal to 100,000 BTU. Many gas bills use therms because they reflect energy delivered more clearly than raw gas volume alone.
3. Why is BTU per cubic foot needed?
Natural gas energy content is not always exactly the same. BTU per cubic foot lets the calculator convert gas volume into energy more accurately for your actual supply.
4. Why is there a correction factor?
Some utilities apply correction factors for pressure, temperature, altitude, or billing adjustments. This value changes the final therm result so it better matches utility reporting.
5. Is 1 CCF always equal to 1 therm?
No. It is only near 1 therm when gas heat content is close to 1000 BTU per cubic foot and the correction factor is 1. Real bills can be slightly higher or lower.
6. Can this calculator estimate my gas cost?
Yes. Enter your cost per therm and the calculator multiplies it by adjusted therms. This gives a quick estimate, though taxes and fixed charges may still apply.
7. What is the difference between CCF and MCF?
CCF is 100 cubic feet. MCF is 1,000 cubic feet. That means 1 MCF equals 10 CCF, so this calculator also shows the equivalent MCF value.
8. Will this match every utility bill exactly?
Usually it gets very close when your bill values are entered correctly. Exact bills may still differ because of utility rounding rules, taxes, delivery charges, or separate service fees.