Calculators / Pool
Cubic feet to gallons
Put in cubic feet, gallons, cubic yards or liters. You'll get the rest, and what it weighs full of water.
Updated · How we check our numbers
Converted
100 cu ft = 748 gal
That's 2,831 liters and 3.7 cubic yards. Water that fills it weighs 6,239 lb.
- Cubic feet
- 100
- US gallons
- 748
- Liters
- 2,831
- Cubic yards
- 3.7
Estimate for planning only, not professional advice. Check the manufacturer’s instructions, your local code and a licensed professional before you buy, build or install. Use at your own risk. Terms.
100 cu ft
gallons = 100 cu ft × 7.48 = 748.1
weight = 748.1 gal × 8.34 lb = 6,239 lb
These are US gallons, 231 cubic inches each. An imperial gallon is about 20% bigger.
Full of water, that's 6,239 lb. On a deck, check the hot tub calculator before you fill it.
How we work it out
A US gallon is 231 cubic inches, exactly. A cubic foot is 12 × 12 × 12 = 1,728 cubic inches, so it holds 1,728 ÷ 231 = 7.48 gallons.
gallons = cubic feet × 7.48
cubic feet = gallons ÷ 7.48
A cubic yard is 27 cubic feet, about 202 gallons. A gallon is 3.785 liters. Water weighs about 8.34 lb a gallon, so a cubic foot of it is about 62 lb.
Where the numbers come from
Water and volume
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