CCF to Therms Calculator — Natural Gas Energy Conversion
Convert CCF (hundred cubic feet) of natural gas to therms and MMBtu. Enter your CCF usage from your gas bill and the heating value of your local gas to get the exact energy equivalent.
CCF
BTU/ft³
Therms = CCF × 100 ft³/CCF × BTU/ft³ ÷ 100,000 BTU/therm
- 1
Cubic feet = CCF × 100
10 × 100 = 1,000 - 2
Total BTU = ft³ × BTU/ft³
1,000 × 1,020 = 1,020,000 - 3
Therms = BTU ÷ 100,000
1,020,000 ÷ 100,000 = 10.2000
How does this calculator work?
Multiply CCF by 100 to get cubic feet, then multiply by the gas BTU content (default ≈ 1,020 BTU/ft³), and divide by 100,000 to get therms. At the US average, 1 CCF ≈ 1.02 therms. The exact rate depends on your supplier's gas heating value, printed on your bill.
Formula
How this is calculated
Natural gas is billed in CCF (hundred cubic feet), but energy content is measured in BTU or therms. To convert, you multiply the volume in cubic feet by the energy density of the gas — the BTU content per cubic foot — then divide by 100,000 (the BTU in one therm). One CCF = 100 cubic feet, so 1 CCF of gas at the US average of 1,020 BTU/ft³ contains 102,000 BTU = 1.02 therms.
The BTU content of natural gas is not fixed — it varies by region, supplier and season. Typical US residential pipeline gas ranges from about 950 to 1,050 BTU/ft³. Your gas utility publishes the exact value (sometimes called "heating value" or "BTU factor") on your monthly bill or on their website. Entering the correct value gives you an accurate therm count; the default of 1,020 BTU/ft³ is a reasonable US average for estimation.
Some utilities already bill directly in therms by metering volume and applying the BTU factor internally. If your bill already shows therms, no conversion is needed. MMBtu (million BTU) is the unit used in wholesale gas markets and large commercial billing.
Frequently asked questions
At the US average heating value of about 1,020 BTU/ft³, 1 CCF ≈ 1.02 therms. The exact figure depends on your local gas composition — check your utility bill for the BTU factor.
CCF is a volume unit (hundred cubic feet), while therms measure energy. Your utility multiplies the CCF by the gas's BTU content and divides by 100,000 to get therms. Rates are often shown in $/therm even when volume is measured in CCF.
Look for "average BTU per cubic foot", "heat content factor" or "BTU factor" on your gas bill or on your utility's website. It is typically between 950 and 1,050 BTU/ft³ for US pipeline natural gas.
TG we-Calculate Editorial Team. (2026). CCF to Therms Calculator — Natural Gas Energy Conversion [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/ccf-to-therms-calculator
TG we-Calculate Editorial Team. "CCF to Therms Calculator — Natural Gas Energy Conversion." TG we-Calculate. 2026. https://we-calculate.com/calculator/ccf-to-therms-calculator.
TG we-Calculate Editorial Team, "CCF to Therms Calculator — Natural Gas Energy Conversion," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/ccf-to-therms-calculator
@misc{wecalculate_ccf_to_therms_calculator, title = {CCF to Therms Calculator — Natural Gas Energy Conversion}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/ccf-to-therms-calculator}}, year = {2026}, note = {TG we-Calculate} }
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