How to use the Natural Gas Cubic Feet to BTU Calculator
- Use your gas supplier’s heating value for the same reference pressure and temperature as the entered gas volume.
- Choose gas-volume-to-energy or the reverse direction. Enter the known amount and the stated gas heat content.
- Select Calculate. Review the result and its working; if you change an input, calculate again before copying or sharing.
Cubic Feet to BTU formula
Fuel energy equals gas volume times heat content. Kilowatt-hour output expresses the same fuel energy in a different energy unit.
BTU = ft³ × BTU/ft³; kWh = BTU ÷ 3,412.141633
What the terms mean
- Gas volume (ft³) or energy (BTU)
- A numeric input used by the displayed calculation.
- Gas heat content
- Illustrative heating value. Use the value and volume conditions from your gas provider.
Cubic Feet to BTU worked examples
Estimate fuel energy in measured natural gas
Use 100 ft³ of gas with an illustrative heat content of 1,030 BTU (IT)/ft³. This is fuel energy, not delivered heat.
- Energy = gas volume × heat content
Answer: 103,000 BTU. Heat content used: 1,030 BTU (IT)/ft³.
Find gas volume for a stated fuel-energy amount
At the same heat content of 1,030 BTU (IT)/ft³, find the gas volume corresponding to 10,300 BTU.
- Gas volume = energy ÷ heat content
Answer: 10 ft³. Heat content used: 1,030 BTU (IT)/ft³.
Natural Gas Cubic Feet to BTU Calculator FAQs
Does the result equal useful heat from a heater?
No. It is fuel energy. Appliance efficiency and losses affect the useful heat delivered.
Can I use it for helium?
Helium is not a combustible fuel with the natural-gas heating value shown. Do not use that value for helium.
Measurement guide for Cubic Feet to BTU
Obtain gas heat content from the supplier or bill and use the same volume reference conditions. Check whether the stated value uses higher or lower heating value.
Assumptions and limits
Heating value varies with gas composition. The illustrative 1,030 BTU per cubic foot is editable; it is not a universal constant.
Use the heating value and reference volume conditions supplied by your gas provider. This measures fuel energy, not delivered heat or electricity.
Check your result
Divide fuel energy by the stated heat content to check gas volume. The estimate does not include appliance losses or electricity-generation efficiency.