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Compost Calculator — Topdress & Mix-In Rates

Compost volume for thin topdressing or deep mix-in, in cu ft, yards and bags.

Inputs

Inputs and assumptions

Pick how you measured the bed.

Bed length for rectangles.

Bed width for rectangles.

Bed diameter for circles.

Measured area, if known.

1/4-1/2 in topdress, 2-3 in to mix in.

Spreading loss.

Check the bag label.

Bulk price, 0 skips cost.

Result

Bags to buy
3
Material cost (USD)
8
Compost volume (cu ft)
4.2 cu ft
Order (cu yd)
0.17 cu yd
Compost estimate only. Nutrient content varies by feedstock; a soil test beats any rule of thumb for heavy feeders.

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Save the estimate with its measurements.

Reopen this job at the store, recheck the math, and print the material list.

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