Biology

Compost Calculator

Estimate compost volume needed for a bed.

Bed length

Bed width

Depth

Calculated Output

Compost volume 10.667

Volume 0.3951

Bags (1.5 ft³) 8

Formula: ft³ = length × width × depth/12

Step-by-Step Breakdown

1. Values used:

2. Bed length = 16

3. Bed width = 4

4. Depth = 2

6. Compost volume = 10.667

7. Volume = 0.3951

8. Bags (1.5 ft³) = 8

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The math behind it

Volume (ft³) = length × width × depth (in feet). 1 yd³ = 27 ft³.

16×4 ft at 2 in → 10.7 ft³.

How deep?

1–3 in as a top dressing; more when building a new bed.