Convert CCF to therms and other gas energy units using a heat content factor, or estimate a natural gas bill from usage and price per therm.

Changing the input unit reinterprets the amount. Use your utility’s heat factor for gas volume.

Illustrative default 1.037. Replace with your utility’s factor.

Display precision

Blank uses 4; tiny nonzero values use scientific notation.

CCF to Therms Formula

The following formula is used to convert CCF (hundred cubic feet; 1 CCF = 100 ft³) of natural gas to therms of energy (using an illustrative higher heating value of ≈ 1,037 BTU/ft³; use your utility’s actual factor).

T = 1.037 × CCF
  • Where T is therms of energy
  • CCF is the volume of natural gas in hundred cubic feet (1 CCF = 100 ft³)

To calculate therms from CCF, multiply the CCF by 1.037 (assumes illustrative natural gas HHV ≈ 1,037 BTU/ft³ and 1 therm = 100,000 BTU).

CCF to Therms Conversion Table (Illustrative Natural Gas HHV ≈ 1,037 BTU/ft³)
CCF Therms (thm)
1/160.065
⅛0.130
1/60.173
¼0.259
⅓0.346
⅜0.389
½0.519
⅝0.648
⅔0.691
¾0.778
⅞0.907
11.037
1¼1.296
1⅓1.383
1½1.556
1¾1.815
22.074
2½2.593
33.111
44.148
Assumes illustrative natural gas higher heating value ≈ 1,037 BTU/ft³. 1 CCF = 100 ft³ ≈ 103,700 BTU; 1 therm = 100,000 BTU. Therefore, 1 CCF ≈ 1.037 therms.

The number of therms of energy can then be converted into British thermal units (BTU) using the formula:

BTUs = T * 100,000

  • Where BTU is British thermal units

What is a therm?

A therm is a unit of measure of energy, typically used when dealing with large amounts of energy. In the U.S., 1 therm is defined as 100,000 BTU.

How to convert CCF to therms?

The following example problem outlines the steps and information needed to calculate the total number of therms given the volume of natural gas.

First, determine the total volume of natural gas. For this example problem, the total volume is measured to be 500 ft³.

Next, convert cubic feet to CCF (since 1 CCF = 100 ft³).

CCF = 500 / 100

CCF = 5

Now, choose Convert volume or energy, enter 5 CCF, select Therms and the illustrative heat factor 1.037, then select Calculate. Other tasks infer the factor, check CCF against therms, or estimate a flat-rate USD gas bill.

T = 1.037 * CCF

T = 1.037 * 5

T = 5.185 therms (about 5.19)

Then to convert into BTUs, multiply by 100,000.

BTUs = T * 100,000

BTUs = 5.185 * 100,000

BTUs = 518,500