Natural Gas Converter

Convert natural gas between volume and energy units instantly.

Supports cubic feet, cubic meters, therms, BTU, joules, barrels of oil equivalent, and more.

Updated August 18, 2026

CreatorFrank Zhao

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Introduction

Natural gas is measured in two fundamentally different ways: volume (the physical space the gas occupies) and energy (the heat produced when it is burned). A gas bill might list cubic feet, a pipeline contract might specify Mcf, and an energy report might use therms or BTU — but they are all describing the same fuel. This calculator converts instantly between any of the 6 volume units and 9 energy units commonly used in the natural gas industry.

Why two kinds of units?

Volume tells you how much space the gas takes in a tank or pipeline. Energy tells you how much useful heat it will deliver. The same volume of gas can have different energy content depending on its composition and local conditions, so industry uses a standard heating value of $1\ \mathrm{ft}^3 = 1{,}039\ \mathrm{BTU}$ to bridge the two.

How to use

The calculator has two fields — one for volume, one for energy. Enter a value in either field, and the other updates automatically. Switch units with the dropdown on the right side of each field.

Enter a number in the Volume units field (e.g. $100$ ). The default unit is cubic feet (ft³).

The Energy units field instantly shows the equivalent in BTU (default). You can also type directly into the energy field to go the other direction.

Use the unit dropdown to switch. For example, change the volume unit to m³ to see the metric equivalent, or change the energy unit to therms for a gas-bill-friendly number.

Worked example

Convert 500 cubic feet of natural gas to therms:

500\ \mathrm{ft}^3

\times

\frac{1{,}039\ \mathrm{BTU}}{1\ \mathrm{ft}^3}

=

519{,}500\ \mathrm{BTU}

Then convert BTU to therms: $519{,}500 \div 100{,}000 = 5.195\ \mathrm{thm}$ . Or simply enter 500 ft³ and switch the energy unit to therms — the calculator does both steps instantly.

Key conversion factors

All conversions in this calculator are anchored to a single relationship: the standard heating value of natural gas. Every volume-to-energy and energy-to-volume conversion passes through this factor.

The core relationship

1\ \mathrm{ft}^3 = 1{,}039\ \mathrm{BTU}

Volume to ft³

• $1\ \mathrm{Mcf} = 1{,}000\ \mathrm{ft}^3$
• $1\ \mathrm{MMcf} = 1{,}000{,}000\ \mathrm{ft}^3$
• $1\ \mathrm{m}^3 \approx 35.31\ \mathrm{ft}^3$
• $1\ \mathrm{Mcm} \approx 35{,}311\ \mathrm{ft}^3$

Energy to ft³

• $1\ \mathrm{therm} \approx 96.90\ \mathrm{ft}^3$
• $1\ \mathrm{MBTU} \approx 0.9625\ \mathrm{ft}^3$
• $1\ \mathrm{MJ} \approx 0.9124\ \mathrm{ft}^3$
• $1\ \mathrm{BOE} \approx 5{,}263\ \mathrm{ft}^3$

Unit reference

Unit	Abbreviation	Type	Equivalence
Cubic feet	ft³	Volume	$1{,}039\ \mathrm{BTU}$
Thousand cubic feet	Mcf	Volume	$1{,}000\ \mathrm{ft}^3$
Million cubic feet	MMcf	Volume	$10^6\ \mathrm{ft}^3$
Cubic meters	m³	Volume	$\approx 35.31\ \mathrm{ft}^3$
Therm	thm	Energy	$100{,}000\ \mathrm{BTU}$
British thermal unit	BTU	Energy	Standard unit
Thousand BTU	MBTU	Energy	$1{,}000\ \mathrm{BTU}$
Million BTU	MmBTU	Energy	$10^6\ \mathrm{BTU}$
Joule	J	Energy	SI unit
Megajoule	MJ	Energy	$10^6\ \mathrm{J}$
Barrel of oil equivalent	BOE	Energy	$\approx 5{,}263\ \mathrm{ft}^3$

Frequently asked questions

What is the difference between volume and energy units?

Volume units (ft³, Mcf, m³) measure how much physical space the gas occupies — useful for pipeline capacity, tank sizing, and meter readings. Energy units (BTU, therms, MJ, BOE) measure how much heat the gas can produce — useful for billing, heating load calculations, and comparing fuels. The two are linked by the gas's heating value.

How many BTU are in one therm?

One therm equals $100{,}000\ \mathrm{BTU}$ . Since $1\ \mathrm{ft}^3 = 1{,}039\ \mathrm{BTU}$ , one therm corresponds to approximately 96.9 cubic feet of natural gas. Gas utilities in the United States commonly bill in therms.

What is a BOE (barrel of oil equivalent)?

A barrel of oil equivalent is a standard unit used in the energy industry to compare different fuels. One BOE is roughly the energy content of one barrel of crude oil, which is approximately $5{,}263\ \mathrm{ft}^3$ of natural gas. It helps energy companies compare natural gas production with oil production on a common basis.

Why does the calculator use 1,039 BTU per cubic foot?

The value $1{,}039\ \mathrm{BTU/ft}^3$ is the standard heating value commonly used in the natural gas industry for typical pipeline-quality gas. Actual heating values can vary slightly depending on the gas composition (methane content, trace gases, etc.), but 1,039 is the widely accepted reference for general conversions.

Limitations

•This calculator uses a standard heating value of $1{,}039\ \mathrm{BTU/ft}^3$ . Actual energy content varies with gas composition, temperature, and pressure.
•Conversions are approximate and intended for general reference, billing estimates, and educational purposes. For custody-transfer billing or engineering design, use measured values from your gas supplier or a certified laboratory.
•The cubic meter to cubic feet conversion uses $1\ \mathrm{m}^3 = \frac{6{,}250}{177}\ \mathrm{ft}^3$ , consistent with the source calculator's factor of $1\ \mathrm{ft}^3 = 0.02832\ \mathrm{m}^3$ .

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