Compost calculator
PROCompost quantity for beds, lawns and gardens.
Short answer: cu yd = (L × W × depth/12) ÷ 27. 20 × 10 ft × 2" = 33 cu ft ≈ 1.23 cu yd. Enter your measurements above and the compost calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Cubic yards
1.23
1 cu ft bags
34
Est. cost
$56
How does the compost calculator work?
cu yd = (L × W × depth/12) ÷ 27.
What does a worked example look like?
20 × 10 ft × 2" = 33 cu ft ≈ 1.23 cu yd.
What do people ask most?
›Topdress depth?
¼–½" over lawns; 1–2" mixed into beds.
Which garden calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.