CCF to Therms Calculator

One CCF (100 cubic feet) of natural gas equals approximately 1.037 therms. Formula: Therms = CCF × 1.037. This conversion is based on the average heating value of natural gas, which varies slightly by region and gas composition. Utility companies use this conversion for billing. For example, if you use 50 CCF of natural gas, that equals 50 × 1.037 = 51.85 therms. Your gas bill typically lists usage in therms, and the meter measures volume in CCF. The conversion factor may range from 1.025 to 1.050 depending on gas quality.

CCF stands for Centum Cubic Feet (Latin "centum" = hundred). 1 CCF = 100 cubic feet of natural gas. Since natural gas is a gas, its volume changes with temperature and pressure. Utility companies apply temperature and pressure corrections to ensure accurate billing. One CCF of natural gas contains about 1,037,000 BTUs (British Thermal Units) of energy. A typical US home uses 50-150 CCF per month in winter for heating, and 10-30 CCF per month in summer for water heating and cooking.

A therm is a unit of heat energy equal to 100,000 BTUs (British Thermal Units). Natural gas bills often use therms because it represents the energy delivered, not just the volume. Since gas heating value can vary, billing by therms is more accurate than by volume. One therm of natural gas produces about 100,000 BTUs of heat. In comparison: 1 therm ≈ 29.3 kWh of electricity. The average US home uses about 500-1,000 therms per year for heating, water heating, and cooking combined.

Your gas bill typically works in stages: The gas meter measures volume in CCF (or HCF). The utility multiplies by the heating value factor (about 1.037) to convert to therms. Some utilities use MCF (thousand cubic feet) instead, where 1 MCF = 10 CCF = about 10.37 therms. Your bill shows: Therms used × price per therm = gas charge. To estimate your bill: CCF used × 1.037 = therms. Example: 75 CCF × 1.037 = 77.8 therms. At $1.50/therm, gas cost = $116.70. Plus delivery fees and taxes.