Cubic Feet Calculator

Multiply length x width x height, keeping all three in feet: a 10 ft long, 12 ft wide, 8 ft tall room is 10 x 12 x 8 = 960 cubic feet. If you measured in inches, divide the result by 1,728 (12 x 12 x 12). The box calculator above does both, plus cylinders and multi-room project totals.

960 cubic feet (10 x 12 x 8 = 960). That is 35.56 cubic yards (960 / 27), about 7,181 US gallons, or 27,184 liters. Use the box tab above as a cubic feet of a room calculator: enter length, width, and ceiling height, then use the project tab to add several rooms together for a whole-house total.

Divide by 27, because one cubic yard is a 3 ft x 3 ft x 3 ft cube = 27 cubic feet. So 54 cubic feet = 2 cubic yards, 27 cubic feet to cubic yards is exactly 1, and 100 cubic feet = 3.70 cubic yards. Our cubic yards calculator mode converts both directions and also shows gallons, liters, and cubic meters. Order bulk materials (soil, mulch, gravel, concrete) in cubic yards once you pass about 27 cubic feet.

One cubic foot holds 7.48052 US gallons (exactly 1,728 / 231, since a US gallon is 231 cubic inches). How many cubic feet in a 5 gallon bucket? A standard 5-gallon bucket holds 0.6684 cubic feet. For dedicated US/imperial gallon conversions with aquarium and pool context, see our cubic feet to gallons converter.

28.3168 liters (exactly 28.316846592 L, since 1 ft = 0.3048 m by definition). So 10 cubic feet = 283.17 liters, and the same converter handles cubic feet to cubic meters (multiply by 0.0283168): 1 cubic meter = 35.3147 cubic feet. The unit converter tab above converts cubic feet to liters, gallons, cubic yards, cubic inches, and cubic meters both ways.

Use pi x radius^2 x height. A cylinder 2 ft in diameter and 5 ft tall has radius 1 ft, so 3.1416 x 1 x 5 = 15.71 cubic feet (about 117.5 US gallons). Enter diameter or radius in the cubic feet in a cylinder calculator tab above. For full circle geometry (area, circumference) see our cylinder volume suite instead.

27 cubic feet = 1 cubic yard. A cubic yard is 3 ft x 3 ft x 3 ft. Quick reference: 1 cubic yard = 27 ft3 = 201.97 US gallons = 764.55 liters = 0.7646 cubic meters. Suppliers sell topsoil, mulch, and gravel by the cubic yard; use this page as a cubic yard calculator - the converter above switches between cubic feet and cubic yards instantly.

Measure each box's length, width, and height in inches, multiply them, then divide by 1,728. A common 18 x 18 x 24 in moving box is 7,776 / 1,728 = 4.5 cubic feet. This cubic feet calculator for moving boxes adds up all boxes (plus furniture approximated as boxes) in the project tab to estimate truck space; a 10 ft truck holds roughly 400 cubic feet.

Divide your cubic feet by the bag's nominal volume and round up. With 2-cubic-foot bags: 27 cubic feet needs ceil(27 / 2) = 14 bags. Bag yields are nominal - check the label, since brands vary. The material estimator above covers topsoil, mulch, and gravel bag sizes. For concrete to fill a drilled hole, use our hole volume calculator instead.

Use cubic yards for bulk orders: soil, mulch, gravel, and concrete are sold by the cubic yard, and one yard (27 cubic feet) is the natural unit once a project passes a few dozen cubic feet. Use cubic feet for rooms, boxes, freezers, and aquariums. Rule of thumb: under ~27 cubic feet stay in cubic feet; above it, convert (divide by 27).

Square feet measure area (length x width, e.g., floor space); cubic feet measure volume (length x width x height, e.g., room capacity). A 10 x 12 ft room is 120 square feet of floor but 960 cubic feet of air at 8 ft ceilings. To go from square feet to cubic feet, multiply by the height or depth in feet.

The math is exact from definitional constants (1 ft = 0.3048 m; 1 US gallon = 231 in3). For ordering, add a waste allowance: 5-10% for soil and mulch (settling and uneven ground), 10% for concrete. Bag counts always round up, and nominal bag yields vary by brand - verify against the label. This is a planning estimate, not professional engineering advice.