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Compost Calculator

% Organic Content of Soil:
% Organic Matter Content of Compost:
Specified % of Org. Content of Backfill:
Tons Compost Req / Ton Soil (1):
Bulk Density of Soil:
Bulk Density of Compost:
Tons of Soil /AC Foot (2):
Tons Compost Req. / C.Y. of Compost (3):
Tons Soil Req. / C.Y. of Soil (4):
Tons Compost Req. / C.Y. of Soil (5):
C.Y. of Compost Required / C.Y. of Soil (6):
Tons of Compost Req/AC. Foot. of Soil (7):
C.Y. of Compost Required/AC. Foot Soil (8):
Inches of Compost Required on Planting Substrate (9):

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Notes

(1) Equal to % Organic Content of Backfill minus % Organic Content of Existing Topsoil

(2) Product of the bulk density of soil, the wt. of water: 62.4 lbs/C.F. (0.0312 T/C.F.) & sq. ft. in an acre.

(3) Product of the bulk density of the compost & the wt. of water: 62.4 lbs/C.F. (0.8424 T/C.Y.)

(4) Product of the bulk density of the soil & the wt. of water (0.8424 T.)

(5) Product of the tons of compost required per ton of soil & the wt. of a C.Y. of soil.

(6) Product of the tons of compost required per ton of soil & the wt. of a C.Y. of compost.

(7) Product of the tons of compost required per ton of soil & tons of soil per ac. ft.

(8) Tons of compost req. per ac. ft. of soil divided by wt. of a C.Y. of the compost

(9) C.F. of compost req. per ac. ft. divided by 43560 S.F. per ac. and the 12" depth of a C.F.

In calculating the weight of an acre-foot of soil, soil is compared to water in weight. When a soil has a density of 1.32, it means the soil weighs 1.32 times more than the equivalent amount of water.

Approximate Bulk Density of Various Soil Texture Classes

Textural Class	Bulk Density (g/cc)
Sand	1.55
Sandy Loam	1.40
Fine Sandy Loam	1.30
Loam	1.20
Silt Loam	1.15
Clay Loam	1.10
Clay	1.05
Aggregated Clay	1.00

For more information on soil partical density, go to http://www.westernlaboratories.com/

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