CCF to Therms Calculator
Convert CCF (100 cubic feet) of natural gas to therms, BTU, kWh, and megajoules. Calculate gas bill costs with adjustable BTU factor and price per therm.
CCF to Therms Calculator
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Formula: Therms = CCF x BTU Factor (typically 1.037)
Worked example — 45 CCF = 46.665 therms = 4,500,000 BTU, costing $70.00
Formula
Therms = CCF x BTU Factor (typically 1.037)
CCF (Centum Cubic Feet) equals 100 cubic feet of natural gas. One therm equals 100,000 BTU. Since 1 CCF contains approximately 103,700 BTU, the conversion factor is about 1.037 therms per CCF. The exact factor depends on gas composition and is specified by your utility. Additional conversions: 1 therm = 29.3 kWh = 105.5 MJ.
Worked Examples
Example 1: Monthly Gas Bill Conversion
Problem:Your gas bill shows 45 CCF of usage. Convert to therms and calculate cost at $1.50/therm.
Solution:Therms = CCF x BTU factor Therms = 45 x 1.037 = 46.665 therms BTU = 45 x 100,000 = 4,500,000 BTU Cost = 46.665 x $1.50 = $70.00
Result:45 CCF = 46.665 therms = 4,500,000 BTU, costing $70.00
Example 2: Energy Equivalent in kWh
Problem:Convert 10 CCF of natural gas to kilowatt-hours.
Solution:Therms = 10 x 1.037 = 10.37 therms kWh = 10.37 x 29.3001 = 303.84 kWh MJ = 10.37 x 105.506 = 1,094.10 MJ
Result:10 CCF = 10.37 therms = 303.84 kWh
Frequently Asked Questions
What is CCF and how does it relate to therms?
CCF stands for Centum Cubic Feet, meaning 100 cubic feet of natural gas. It is a volume measurement used by many gas utilities for billing. A therm is a unit of energy equal to 100,000 BTU. Since 100 cubic feet of natural gas contains approximately 103,700 BTU (depending on gas composition), 1 CCF equals approximately 1.037 therms. The exact conversion factor varies by region and gas quality, typically ranging from 1.02 to 1.06 therms per CCF.
Why does the CCF to therm conversion factor vary?
The conversion factor depends on the energy content (heating value) of the natural gas, which varies based on its chemical composition. Pipeline-quality natural gas is mostly methane but contains varying amounts of ethane, propane, and other hydrocarbons that affect its energy density. Gas from different regions and suppliers has slightly different compositions. Your gas utility measures this and typically prints the actual BTU factor on your bill. The national average is about 1.037 therms per CCF, but it can range from 1.02 to 1.06.
How do I read my natural gas bill using CCF or therms?
Gas bills typically show your usage in either CCF or therms, depending on your utility. If billed in CCF, multiply by your local therm factor (usually around 1.037) to get therms. If billed in therms directly, each therm represents 100,000 BTU of energy. A typical US household uses about 50-100 therms per month during winter for heating. To estimate costs, multiply therms by your rate per therm, then add fixed charges and taxes shown on your bill.
How does natural gas energy compare to electricity?
One therm of natural gas equals 29.3 kWh of electrical energy. However, direct comparison requires considering efficiency. A modern gas furnace operates at 90-98% efficiency, while electric resistance heating is 100% efficient at the point of use. Heat pumps can deliver 2-4 times more heat per kWh than resistance heating. On a cost basis, natural gas typically costs $1.00-$2.00 per therm while electricity costs $0.10-$0.30 per kWh, making gas heating cheaper in most US regions despite lower appliance efficiency.
What is the difference between CCF, MCF and a dekatherm?
CCF is a volume unit meaning one hundred cubic feet, while MCF means one thousand cubic feet, so 1 MCF equals 10 CCF. A dekatherm is an energy unit equal to 10 therms, that is 1,000,000 BTU, which is the same quantity commodity traders call one MMBtu. Because roughly 1.037 therms sit in each CCF, one MCF of pipeline gas carries about 10.37 therms, or 1.037 dekatherms. Residential bills usually use CCF or therms, while wholesale and industrial contracts are quoted in dollars per MMBtu or per dekatherm.
Why does my utility apply a pressure or altitude correction factor?
A diaphragm gas meter measures volume at whatever pressure and temperature the gas happens to be at, but the energy delivered depends on how much gas is actually in that volume. If the service is delivered above standard pressure, each cubic foot contains proportionally more gas and the billed volume is multiplied by a pressure factor greater than one. At high elevation the ambient pressure is lower and the factor drops below one. The utility multiplies metered cubic feet by this correction and then by the BTU factor to reach billed therms.
What is the difference between higher and lower heating value for natural gas?
Burning methane produces water vapour, and the higher heating value counts the latent heat released if that vapour condenses back to liquid, while the lower heating value does not. For natural gas the higher figure runs roughly a tenth above the lower one. North American utilities bill on the higher heating value, which is the basis behind the 1,037 BTU per cubic foot figure used here. That is also why a condensing furnace, which cools the flue gas enough to recover some latent heat, can post efficiencies above 90 percent while a non-condensing unit cannot.
How do I convert therms into megajoules or gigajoules?
One therm is 100,000 BTU, and the international-table BTU is 1,055.06 joules, so a therm is 105.506 megajoules or 0.105506 gigajoules. Inverting that, one gigajoule is about 9.478 therms, and at a factor of 1.037 therms per CCF that is roughly 9.14 CCF. Canadian utilities bill in gigajoules and most of the rest of the world in cubic metres or kilowatt-hours, so these factors are what you need to place a US gas bill alongside a foreign one on a common energy basis.
How much usable heat does one therm deliver through a furnace?
A therm is the energy in the fuel, not the heat that reaches the rooms. Annual fuel utilisation efficiency, or AFUE, is the seasonal fraction that becomes useful heat. A 95 percent AFUE condensing furnace turns a therm into about 95,000 BTU of delivered heat, while an 80 percent unit delivers 80,000 BTU. A house needing 30 million BTU of delivered heat over a winter therefore burns 375 therms at 80 percent AFUE but only about 316 therms at 95 percent, which is the arithmetic behind any furnace-replacement payback estimate.
How can I predict next month's CCF usage from heating degree days?
Space heating load tracks heating degree days almost linearly, so past bills give you a usable coefficient. If a month with 800 heating degree days consumed 60 therms, that is 0.075 therms per degree day. A forecast month with 500 degree days would then need about 37.5 therms of heating gas. Add your summer baseline, the flat usage from water heating, cooking and pilot lights that appears in months with no heating demand, then divide the total by the therm factor to get expected CCF.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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