Cubic Feet Guides
Everything you need to confidently work with cubic feet. Each guide is written from first principles, with worked examples, conversion factors, and links to the matching calculator.
How to Calculate Cubic Feet — The Complete Guide
Step-by-step guide to calculating cubic feet for any shape, in any unit, with worked examples.
Cubic Feet Formulas — Reference for Every Shape
Reference guide of cubic feet formulas for cuboids, cylinders, spheres, cones, prisms and more.
Cubic Feet Unit Conversion Chart
Printable conversion chart between cubic feet and every common volume unit.
Common Cubic Feet Mistakes & How to Avoid Them
The most common cubic feet calculation errors and how to fix them.
Where to start
If cubic feet is new to you, read How to Calculate Cubic Feet first. It covers the basic formula, the step-by-step process, and worked examples for every shape and unit. The other three guides go deeper:
- Formulas reference — every shape formula in one place, plus material density factors for weight estimation.
- Unit conversion chart — printable chart for length, volume, and material conversions. Designed to fit one sheet of paper.
- Common mistakes — the dozen errors that account for most wrong answers, with examples and fixes.
Then jump to a calculator
The guides explain the math. The calculators do it for you. Most people end up using one of the shape calculators (rectangular, cylinder, sphere, cone) or one of the practical use-case calculators for things like concrete bags, mulch orders, or moving truck sizing.
Popular calculators
Calculate the cubic feet of any rectangular box, room, or container using length, width, and height.
OpenCalculate the cubic feet of a cylinder from radius or diameter and height. Mixed-unit support.
OpenConvert dimensions in inches to cubic feet instantly. Divides by 1,728 internally.
OpenCalculate cubic feet of concrete for slabs, footings, and pathways. Includes bag count and weight.
OpenCalculate cubic feet of mulch and convert to standard 1, 1.5, and 2 ft³ bag counts.
OpenAdd household items, get total cubic feet, and find the right moving truck size.
Open