Enter the total cost and the gas usage (in therms, CCF/MCF, ft³, or m³) into the calculator to determine the cost per therm. If you enter a volume unit (like ft³/CCF/MCF), this calculator estimates therms using a typical conversion of 1 MCF ≈ 10.38 therms (your utility’s therm factor may differ).
Related Calculators
- Business Finance Calculators
- CCF to Therms Calculator
- Therm to CCF Calculator
- CFH to Therms Calculator
- CCF vs MCF Calculator
- Gas Bill Calculator
Cost Per Therm Formula
The following equation is used to calculate the Cost Per Therm.
CPTH = TC / ((V/1000)\times 10.38)
- Where CPTH is the cost per therm ($/therm)
- TC is the total cost of natural gas ($)
- V is the volume of the natural gas (ft^3)
- 10.38 is a typical conversion factor in therms per 1,000 ft^3 (MCF). Your utility’s therm factor can vary based on the gas heat content.
To calculate the cost per therm from a volume reading, first convert cubic feet to thousand cubic feet (MCF) by dividing by 1000. Then multiply by 10.38 to estimate total therms, and finally divide the total cost by the therms.
What is a Cost Per Therm?
Definition:
Cost per therm is the price you pay per therm of energy, which is most commonly used for natural gas billing.
A therm is a unit of energy equal to 100,000 BTU (about 105.5 MJ). It is not a fixed volume of gas: the number of cubic feet per therm depends on the gas heat content. A common “rule of thumb” is that 1,000 ft³ (1 MCF) is about 10.38 therms (so 1 therm is about 96.3 ft³), but your bill may use a different therm factor.
How to Calculate Cost Per Therm?
Example Problem:
The following example outlines the steps and information needed to calculate Cost Per Therm.
First, determine the total cost of the natural gas. In this example, the total cost is $1250.00.
Next, determine the total volume. The volume of this lot of gas is measured to be 2000 cubic feet.
Finally, calculate the cost per therm using the formula above:
CPTH = TC / ((V/1000) × 10.38)
CPTH = $1250 / ((2000/1000) × 10.38)
CPTH = $1250 / (2 × 10.38) = $1250 / 20.76
CPTH ≈ $60.21/therm
