Cubic Volume Calculator
Cu feet calculator works out Volume (cubic feet) and Volume (cubic yards) from Length, Width and Depth / height / thickness. The default figures on this page give volume (cubic feet) of 60 ft3; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Footprint = 3 x 4 = 12 ft^2
- Volume per item = footprint x depth = 1.6990108 m^3 = 60 ft^3
- 60 ft^3 = 2.2222222 yd^3 = 1.6990108 m^3
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
What the cu feet calculator calculates
Turns measured dimensions (or an area and a depth) into cubic feet, cubic yards, cubic metres, litres and gallons, with quantity, waste allowance, bag count and weight.
How to use this cu feet calculator
Enter Length, Width, Depth / height / thickness and Area. Volume (cubic feet) updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Volume (cubic feet), Volume (cubic yards) and Volume (cubic metres).
The method follows NIST Special Publication 811, Guide for the Use of the International System of Units (exact 1 ft = 0.3048 m, 1 yd3 = 27 ft3) and NIST Handbook 44, Appendix C — General Tables of Units of Measurement (cubic measure and the board foot).
3 ft x 4 ft x 5 ft example
With How are you measuring?: dimensions, Length: 3, Width: 4, Depth / height / thickness: 5, the calculator returns Volume (cubic feet): 60, Volume (cubic yards): 2.22222222, Volume (cubic metres): 1.6990108. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Volume (cubic feet), Volume (cubic yards) and Volume (cubic metres). The inputs you can vary are Length, Width, Depth / height / thickness, Area, Length / width unit and Depth unit.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I calculate cu ft?
Turns measured dimensions (or an area and a depth) into cubic feet, cubic yards, cubic metres, litres and gallons, with quantity, waste allowance, bag count and weight. Open “How this is worked out” beside the result to see each step for your own figures.
How much will 1 cu ft cover?
On the figures this page opens with — length 3, width 4 and depth / height / thickness 5 — the volume (cubic feet) is 60 ft3. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
How many cubic feet is 10x10x10?
It needs Length, Width, Depth / height / thickness, Area, Length / width unit and Depth unit. Nothing else is required, and the figures stay in your browser.
How many cubic feet is 12x12x12 inches?
The result gives Volume (cubic feet), Volume (cubic yards), Volume (cubic metres), Volume (cubic inches), Volume (litres) and Volume (US gallons), each labelled with its unit so the figure can be read on its own.
What information do I need for the cu feet calculator?
You need Length, Width, Depth / height / thickness, Area, Length / width unit, Depth unit, Area unit and Waste / overage allowance. The page opens with default figures that give volume (cubic feet) of 60 ft3, so you can see the scale before entering your own.
What does this cu feet calculator show?
It shows Volume (cubic feet), Volume (cubic yards), Volume (cubic metres), Volume (cubic inches), Volume (litres), Volume (US gallons), Board feet and Volume per item (cubic feet), with the working and any warnings for your entries.