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Compost Calculator

Work out how much compost your project needs — in cubic yards, cubic feet and tons — across any number of beds, lawns or borders. Check your blend ratio, see the organic matter and nutrients you're adding, compare bagged and bulk pricing, and get the true delivered cost.

For estimation purposes only. Nutrient figures are typical ranges — compost varies widely batch to batch. Ask your supplier for a lab analysis before applying at high rates.
1 Areas to amend
Each area keeps its own depth — mix a ½" lawn topdressing with a 2" vegetable-bed amendment in one estimate.
2 Compost type & application
in
0.25"6"12"
Writes to every area above — adjust individual areas afterward.
in
%
lbs
%
in
Depth of spent mulch, sod or debris stripped out first — used for haul-away volume and disposal cost.
3 How you're buying
cu ft
%
4 Hauling & labor
/hr
yd/hr
ppl
Compost needed
—
Enter your areas and click Calculate
Project highlights
Total area —
Cubic feet —
Estimated weight —
Truck loads —
Best-value option —
Total project cost —
Cost breakdown
Calculate to see breakdown
Area-by-area
Add an area to see its volume—
Material needed
Compost type—
Base volume—
Settling allowance—
Total cubic feet—
Total cubic yards—
Estimated weight—
Bags to buy—
Bulk yards to order—
Bulk tons to order—
Delivery loads—
Coverage per cu yd—
Avg. depth applied—
Old mulch to remove—
Compost in finished layer—
Soil benefit & nutrients
Dry matter delivered—
Organic matter added—
Total nitrogen (N)—
First-year available N—
Phosphate (P₂O₅)—
Potash (K₂O)—
C:N ratio—
Available N / 1,000 sq ft—
Est. organic matter gain in the tilled layer—
Bagged vs. by the yard vs. by the ton
Bagged — material—
Bagged — delivered total—
By the yard — material—
By the yard — delivered total—
By the ton — material—
By the ton — delivered total—
Effective $ / cu yd (bagged)—
Effective $ / cu yd (best bulk)—
Savings vs. most expensive option—
Project total
Buying method used—
Material subtotal—
Delivery—
Sales tax—
Spreading time—
Labor cost—
Mulch removal disposal—
Equipment rental—
Cost per 1,000 sq ft—
Cost per cu yd delivered—
Total project cost—
Visualizations
Volume by area
Where the money goes
Disclosure: These are estimates for planning purposes only. Nutrient and organic matter figures are typical values for each compost type — actual analysis varies widely between batches and suppliers, and only a lab test tells you what you're really applying. Bulk volume and weight also vary with moisture. Let fresh or hot compost cure before planting into it, confirm delivery minimums and drop-site access with your supplier, and check local rules before applying manure or biosolids compost to food crops.