CCF to Gallons Converter

1 CCF Is 748.05 Gallons

A CCF is a block of 100 cubic feet (ft³). The US gallon is defined as 231 cubic inches and a cubic foot is 1,728 cubic inches, so 1 ft³ is 1,728 ÷ 231 = 7.4805… gallons and 1 CCF is 100 times that: 748.051948… gallons. The EPA's guide to reading your water bill rounds this to 748 gallons. If your bill shows 12.7 CCF, you used 12.7 × 748.051948 = 9,500.26 gallons, or 35.96 cubic meters.

You can type into either box of the converter above, the bill usage or the converted value, and the other one follows. Know the gallons and want CCF? Use the right-hand box. The results cover seven units at once: CCF, cubic feet, US gallons, thousand gallons (kgal), cubic meters, liters and imperial gallons, and the sign between the two boxes switches from "=" to "≈" when a value has been rounded. The water cube picture draws 1 CCF as a single cube about 4.64 ft (1.41 m) on each side so you can see how many cubes your bill adds up to. Below it, the billing days and the number of people in your home give your daily use per person, and a rate you type in is converted to a price per gallon and a total water charge.

When It Helps to Convert Your Bill from CCF to Gallons

• The number means nothing to you: 12.7 CCF looks small, yet it is over 9,500 gallons. At 82 gallons a day for one American at home, that is 116 days of one person's water. In gallons or liters, you can see how much your household really uses.
• Your bill suddenly jumped: the EPA says that if your use rises without any extra watering of the garden, it can be a sign of a leak. Put this month and last month in the same gallon units and compare the daily use per person, and the increase becomes clear.
• Rate sheets use different units: some utilities quote a price per CCF, others per 1,000 gallons. To compare rates in the town you are moving to, or to read your own rate as a price per gallon, you need one common unit.
• You are matching a capacity listed in gallons: a backyard pool, a water tank or a water heater is sold by gallons. Fill one and you can see right away how many CCF that adds to the bill.

How to Use the Converter

1. Find the usage line on your bill (it may say Usage, Consumption or Units billed) and note the number and the unit. HCF is the same unit as CCF.
2. Type the number into the left box and pick its unit. The default converts CCF to US gallons. The quick buttons for 1, 5, 10, 15 and 25 CCF let you change the size in one tap.
3. To go from gallons back to CCF, type the number into the right box. The box you typed in last is the one that counts, and the other is filled with the converted result. Tap an entry in the "Same amount, every unit" list to make that the unit of the converted value.
4. Choose 0 to 3 decimal places. If a value above zero is so small it would show as 0, the tool shows three significant digits instead.
5. Enter the billing days (Service period, Days) and the number of people at home to get daily use and daily use per person, with a bar comparing it to the US average of 82 gallons.
6. Type a rate from your rate sheet and choose what it is per (1 CCF, 1,000 gal, 1 US gal or 1 m³) to see the rate in the other units and the water charge for this usage.

The Math: From 231 Cubic Inches to 748.05 Gallons

The CCF and the gallon are both defined from the inch, so no approximate figures creep into the math. The steps are:

1. One inch is exactly 2.54 cm, so 1 cubic inch (in³) is 16.387064 cm³.
2. The US liquid gallon is defined as 231 in³, so 1 US gal = 231 × 16.387064 cm³ = 3.785411784 L.
3. One cubic foot is 12 × 12 × 12 = 1,728 in³. So 1 ft³ = 1,728 ÷ 231 = 7.48051948… gallons = 28.316846592 L.
4. 1 CCF = 100 ft³ = 748.051948… gallons = 2,831.6846592 L = 2.8316846592 m³.
5. The imperial gallon is separately defined as 4.54609 L, so 1 CCF = 2,831.6846592 ÷ 4.54609 = 622.88 Imp gal.

In short, multiply by 748.051948 to turn CCF into gallons, and divide by 748.051948 to turn gallons into CCF (multiplying by 0.0013368 gives the same result). If you shorten the factor to the familiar 748, you come out 0.52 gallons low at 10 CCF and 5.19 gallons low at 100 CCF. That makes no difference when you are just reading a bill, but for a table or report the exact defined value, which the converter uses, is cleaner.

Common CCF Values

The cubic-foot column is exact, with no rounding. Because 1 CCF is 748.05 gallons, the gallon figures keep decimals even when the CCF is a whole number.

Converting Gallons to CCF

When a figure is given only in gallons, divide by 748.051948 to read it in bill units. 10,000 gallons is 10,000 ÷ 748.051948 = 13.37 CCF. Some utilities report usage in thousands of gallons (kgal); 1 kgal is 1.34 CCF.

Is Your Household's Use High?

The EPA says the average American uses about 82 gallons a day at home, and that a family of four uses roughly 10,000 gallons in 30 days. Since 82 × 4 × 30 = 9,840 gallons, that is 13.15 CCF. The US Geological Survey (USGS) counts indoor use only and puts it at 80 to 100 gallons per person per day, while noting that estimates differ. The table below uses 82 gallons to show what average use looks like for different household sizes.

Averages swing a lot with region and season. The EPA says outdoor use is about 30% of household water use, and in dry regions it can be far higher. If you water a lawn or garden in summer, comparing against the same month last year tells you more than the national average. Many utilities bill every two months, so enter the actual number of days printed on your bill in the billing days box. The converter's bar shows daily use per person as a percentage of 82 gallons, and at 150% or more it suggests checking for leaks.

Turning a CCF Rate into a Gallon Rate

A rate moves in the opposite direction from volume. Since 1 CCF is 748.05 gallons, dividing the price per CCF by 748.051948 gives the price per gallon, and dividing by 0.748051948 gives the price per 1,000 gallons. $4.50 per CCF is $0.006016 per gallon (0.60¢), $6.02 per 1,000 gallons and $1.59 per cubic meter.

Real rate sheets often rise in tiers as usage grows, or add a meter base charge and a separate sewer charge. The converter's "Water charge for this usage" is a single line, usage × rate. For tiered rates, run each tier's usage and price separately and add them up, then add the base charge and taxes straight from your bill.

How Much Is 1 CCF in Everyday Terms?

1 CCF fills a cube 4.64 ft (1.41 m) on each side. Next to a person 1.7 m tall, that is a box up to about shoulder height. Split the same amount into the things we do with water at home and you get this:

The appliance figures are product standards. Actual shower length, water pressure and wash cycle change what each use takes. The four "In everyday terms" lines in the converter use the standard showerhead, the federal-standard toilet and the standard washer.

On a Gas Bill, CCF Is Read as Therms

CCF also appears on natural gas bills. Gas energy content varies for the same volume, so gas is often billed in therms, a unit of heat, and almost nobody converts a gas volume to gallons. The US Energy Information Administration (EIA) says that, at the 2025 US average heat content, 1 Ccf = 103,700 Btu = 1.037 therms, and that dividing a price per Ccf by 1.037 gives a price per therm. Your actual bill applies a factor matched to the gas delivered that period (the therm factor or BTU factor), so use the factor printed on your bill for accuracy. MCF, which you will often see on gas bills, is 1,000 cubic feet, or 10 CCF. To convert between heat units such as Btu, therms and kWh, use an energy unit converter.

Common Mix-Ups

• Reading the meter dial as your usage: the meter shows a running total. Your usage this period is the present reading minus the previous reading, and both appear on the Previous and Present reading lines of your bill.
• Putting cubic feet in the CCF box: if the meter or the source is in ft³, divide by 100 to get CCF. 1,270 ft³ is 12.7 CCF. Choose ft³ as the unit and the converter does the dividing for you.
• Confusing MCF or kgal with CCF: MCF is 1,000 cubic feet (10 CCF) and kgal is 1,000 gallons (1.34 CCF). The names look alike but the sizes differ by more than 7 times.
• Picking the imperial gallon: gallons on a US bill are US liquid gallons. The imperial gallon is about 20% larger, so the same usage gives a smaller number. 12.7 CCF is 9,500.26 US gal but 7,910.62 Imp gal.
• Mixing CCF with m³ (bills outside the US): many countries bill water in cubic meters. 1 CCF is about 2.83 m³, and 1 m³ is 0.35 CCF.

Limits and Cautions

• This tool converts units of volume. An actual charge that includes tiered rates, a meter base charge, a sewer charge and taxes has to be worked out from the rate sheet on your bill.
• 82 gallons per person per day is a national average and varies a great deal from home to home with climate, yard and season. The percentage on the bar is a reference for comparison, not a verdict.
• If your bill reports usage only in whole CCF, the true usage can differ from the printed value by up to the rounding in the last digit.
• The everyday amounts are rough figures worked out from product standards. They change with real shower time and appliance efficiency.
• To turn a gas bill's CCF into energy, use the heat factor on the bill, not the gallon value from this converter.

Basis: the unit factors are defined values published by NIST and do not change. Average use and appliance figures come from EPA WaterSense (page updated in 2026), USGS and ENERGY STAR, and gas heat content from EIA, all checked on October 20, 2026.

Sources

• 01NIST SP 1038 — The International System of Units (SI): Conversion Factors for General UseUS gallon = 128 fl oz (231 in³), cubic foot = 0.028 316 85 m³
• 02NIST Guide to the SI — Appendix B.8foot = 0.3048 m, gallon (Imperial) = 4.546 09 L
• 03EPA WaterSense — Understanding Your Water BillCCF = HCF = 100 ft³ = 748 gal, about 82 gal per person per day, about 10,000 gal in 30 days for a family of four
• 04EPA WaterSense — How We Use Waterover 300 gal a day for a family, about 70% indoors and 30% outdoors
• 05USGS Water Science School — How much water do I use at home each day?indoor use of about 80 to 100 gal per person per day
• 06EPA WaterSense — Showerheadsstandard showerhead 2.5 gal per minute, WaterSense 2.0 gal or less
• 07EPA WaterSense — Residential Toiletsfederal standard 1.6 gpf, WaterSense 1.28 gpf or less, old toilets up to 6 gpf
• 08ENERGY STAR — Clothes Washerscertified washer 14 gal per load, standard washer 20 gal
• 09U.S. EIA — FAQ: natural gas Ccf and therms1 Ccf = 103,700 Btu = 1.037 therm (2025 average), $/Ccf ÷ 1.037 = $/therm
• 10California State Water Resources Control Board — Water ratesHCF (or CCF) = 100 ft³, 748 gal

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