Cubic Feet Calculators
Pick the calculator that matches your shape, or start from a specific unit. Every tool runs in your browser, supports mixed units, and shows the formula it used.
By shape
Start with the geometry. Each calculator includes a 3D preview and a worked formula.
Calculate the cubic feet of any rectangular box, room, or container using length, width, and height.
Calculate the cubic feet of a cylinder from radius or diameter and height. Mixed-unit support.
Calculate the cubic feet of any sphere or ball using its radius or diameter.
Calculate cubic feet for a cone using radius and height. Useful for tanks, hoppers, and silos.
Calculate cubic feet for a triangular prism from base, triangle height, and prism length.
Break complex shapes into simple segments and sum their volumes for an accurate cubic feet total.
By starting unit
Already have measurements in inches, meters, yards, or centimeters? Skip the conversion step.
Convert dimensions in inches to cubic feet instantly. Divides by 1,728 internally.
Calculate cubic feet from meter dimensions. 1 m³ ≈ 35.3147 ft³.
Calculate cubic feet from yard dimensions. 1 yd³ = 27 ft³.
Calculate cubic feet from centimeter dimensions instantly.
Which calculator should I use?
If you know the shape, pick the matching shape calculator. Most rooms, boxes, and containers are rectangular. Tanks, pipes, and barrels are cylinders. Hoppers, silos, and pile-shaped piles of material are usually cones.
If your shape is complex or has a notch cut out of it, use the irregular shape calculator. Break the shape into rectangular pieces, calculate each one, and the calculator sums them.
If your measurements are not in feet, the unit calculators (inches, meters, yards, centimeters) skip the unit conversion step. They accept the unit you already have and return cubic feet.
If you have a specific project in mind — concrete, mulch, moving, shipping, appliances — see the use-case calculators. They build on the shape math but answer a more practical question (how many bags, which truck size, what wattage).
If you only need to convert between units, see the unit converters.
What every calculator does
- Accepts measurements in inches, feet, yards, centimeters, meters, or millimeters
- Shows the formula it used and the intermediate steps
- Returns cubic feet alongside cubic yards, cubic meters, gallons, and liters
- Includes a 3D preview where the geometry helps
- Saves nothing — calculations happen entirely in your browser
Convert and learn
Convert cubic feet to cubic yards instantly. 27 ft³ = 1 yd³.
OpenConvert cubic feet to US gallons. 1 ft³ ≈ 7.48 US gallons.
OpenStep-by-step guide to calculating cubic feet for any shape, in any unit, with worked examples.
OpenReference guide of cubic feet formulas for cuboids, cylinders, spheres, cones, prisms and more.
Open