A walkthrough, end to end.
- 1
Pick a 3D shape from the selector.
- 2
Enter the relevant dimensions.
- 3
The calculator returns the volume along with the formula used.
Standard volume formulas
Each solid has its own. The calculator picks the right formula. Units cube to volume — input length-units; output is length³ (cubic units).
What you can do with this.
Pool / hot tub volume
Cylindrical pool radius 6 ft, depth 4 ft → π × 36 × 4 = 452 cu ft = 3,381 gallons. Useful for chemical dosing and heater sizing.
Storage tank capacity
Cylindrical fuel tank radius 1 m, length 3 m → π × 1 × 3 = 9.42 cu m = 9,420 liters. Match against expected demand and refill schedule.
Concrete needed
Sidewalk 20 ft × 4 ft × 4 inch deep = 26.7 cu ft = 0.99 cu yards. Concrete sold by yard; round up.
Soil for raised garden bed
8 ft × 4 ft × 1 ft = 32 cu ft = 1.19 cu yards. Bagged soil typically 1.5 cu ft per bag → ~22 bags.
Air conditioning sizing
Room volume × air-change requirement. 14×16×9 ft room = 2,016 cu ft. AC capacity in BTU is roughly cu ft × 1.6 (rough rule). 3,200 BTU minimum.
Ice cream cone capacity
Cone height 5 in, radius 1 in → ⅓π × 1 × 5 = 5.24 cu in. (≈ 86 ml). Useful for portion control in food businesses.
Fish tank water needs
Rectangular tank 36×18×16 in = 10,368 cu in = 6 gal. Always good to know exact for water treatment and stocking calculations.
Volume calculator 2026 — what's current
AR room-measuring apps handle simple cubic measurements. The calculator wins for shape-specific math (spheres, cones, capsules) and exact precision.
Frequently asked.
V = ⁴⁄₃ × π × r³. Often confused with surface area (4πr²). The ⁴⁄₃ coefficient comes from integration.
Decompose into standard solids (cylinders + cones + boxes) and sum. Or use water-displacement physically — submerge object in water and measure displaced volume.
1 cu m = 1,000 liters. 1 cu ft = 28.3 liters = 7.48 US gallons. Conversions handled in unit-converter tools (separate).
No. Calculations run entirely in your browser.