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.
What should you read before you order materials?
Field notes from real jobs that explain the numbers behind this calculator.
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