Compost Calculator — How Much Compost You Need
Enter your garden area and the depth of compost you want to apply. The calculator returns the compost volume in cubic feet and cubic yards.
What this calculator determines
It calculates the compost volume needed to cover a garden area at the depth you choose, returning cubic feet, cubic yards, and liters.
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Examples
150 sq ft, 2 in deep
150 sq ft × 2 in
Calculation
- Depth: 2 ÷ 12 = 0.167 ft
- Volume: 150 × 0.167 = 25 cu ft
- Cubic yards: 25 ÷ 27 = 0.93
25 cu ft (0.93 cu yd)
Assumptions & Conventions
- Volume basis
- Volume = area × depth, with depth entered in inches and converted to feet.
- Unit conversions
- 1 cubic yard = 27 cubic feet; 1 cubic foot = 28.3168 liters.
- Application rate
- The right depth depends on your soil and goals — enter the depth you have decided to apply, not a universal rate.