Cubic Feet Calculator
Calculate the cubic footage of any length, width, and depth, with optional cost per cubic foot and bag-count conversions.
How this calculator works
This is a generic cubic-footage calculator with no assumed material density, useful whenever you just need raw volume rather than a delivery order of tons or bags. It multiplies your length, width, and depth directly into cubic feet.
Formula: Cubic feet = Length ft × Width ft × (Depth in ÷ 12).
Worked example
A 12 ft × 10 ft area at a 6-inch depth:
- Depth in feet: 6 ÷ 12 = 0.5 ft
- Cubic feet: 12 × 10 × 0.5 = 60.00 ft³
- At $1.50/ft³, that’s $90.00.
Coverage reference
| Area | Cubic feet (6 in) |
|---|---|
| 6 × 5 ft | 15.00 ft³ |
| 12 × 10 ft | 60.00 ft³ |
| 24 × 20 ft | 240.00 ft³ |
How to measure your area
Measure the length and width of the footprint in feet and the depth in inches, and multiply straight through without worrying about a material’s density since this tool doesn’t assume one. If you’re ultimately ordering a specific material like soil, gravel, or mulch, use this result to cross-check a material-specific calculator’s bag or ton conversion once you know the volume you need.
Frequently asked questions
How do I convert cubic feet to cubic yards?
Divide your cubic feet result by 27 — there are 27 cubic feet in one cubic yard (3 ft × 3 ft × 3 ft). This calculator's 60 cubic feet default example equals about 2.22 cubic yards, which is useful when a supplier quotes bulk material by the yard instead of the foot.
How many bags of soil or mulch equal my cubic foot result?
Divide your total cubic feet by the bag's stated cubic footage — common bag sizes are 0.75, 1, 1.5, and 2 cubic feet. A 60 cu ft result, for example, works out to 40 bags at 1.5 cu ft each, or 30 bags at 2 cu ft each.
When should I use this generic calculator instead of a material-specific one?
This tool is for a plain cubic-footage number with no assumed density or bag size — useful for shipping quotes, storage volume, aquarium or container sizing, or any project where you just need raw volume. For an actual delivery order of soil, gravel, or mulch, a material-specific calculator will convert that volume into the tons or bags you actually buy.
Is the price per cubic foot optional?
Yes — enter $0 if you only want the volume, or enter a real price per cubic foot if you're comparing a supplier's foot-based quote directly rather than converting to a yard or ton price first.
Does depth need to be in inches?
Yes, enter depth in inches and length and width in feet — this calculator converts inches to feet internally before multiplying, so you don't need to do that conversion yourself.
Estimates only. Verify quantities with your supplier before purchasing.