Gardening Calculator Group

Compost and Mulch Calculators

Estimate compost ingredients, pile conditions, mulch coverage, and settled material needs.

Keep mass, volume, and moisture distinct

A cubic measure of leaves or chips is not equivalent to the same mass of another feedstock. Material density changes with particle size, moisture, compaction, and handling.

For compost recipes, identify whether a value is reported on an as-received or dry basis. For mulch, measure the actual covered area and the depth expected after settling.

Compost and mulch calculators

Compost Carbon Nitrogen RatioCalculate a compost blend carbon-to-nitrogen ratio.Compost Moisture ContentCalculate wet-basis moisture content from a dried sample.Compost Dry MatterEstimate compost dry matter from wet mass and moisture.Compost Pile ShrinkageEstimate finished pile volume after decomposition and settling.Compost Pile MassEstimate compost pile mass from volume and bulk density.Compost Browns Greens RatioExpress a compost recipe as a brown-to-green volume ratio.Compost Temperature ChangeMeasure compost pile temperature change between readings.Compost Turning IntervalSpace planned turns across an active composting period.Temperature Adjusted Composting TimeAdjust composting time for an assumed relative process rate.Finished Compost YieldEstimate finished compost volume after process loss.Mulch Settled DepthEstimate mulch depth after settling.Mulch Initial DepthCalculate initial mulch depth for an expected settling share.Mulch Replacement IntervalSpace mulch inspections across an expected useful life.Mulch Moisture RetentionCompare retained water under mulched and unmulched conditions.Wood Chip Nitrogen Tie UpEstimate nitrogen temporarily immobilized by incorporated wood chips.Leaf Mold YieldEstimate leaf-mold volume after decomposition.Worm Bin Feed RateEstimate worm-bin feed from worm biomass and a feeding fraction.Worm Population GrowthProject worm biomass using an observed growth factor.Vermicompost YieldEstimate vermicompost mass after processing losses.Bokashi Bran RequirementCalculate bokashi bran from food-scrap mass and application rate.Compost Tea DilutionCalculate concentrate for a compost-tea dilution ratio.Compost Extract ConcentrationCalculate compost mass per gallon of extraction water.Biochar Nutrient ChargingEstimate nutrient solution used to pre-charge biochar.Biochar Application RateCalculate biochar volume from treatment area and rate.Kitchen Scrap DiversionEstimate annual kitchen scraps diverted to composting.

Observe the material, not only the ratio

A carbon-to-nitrogen estimate cannot establish compost maturity. Temperature history, odor, structure, moisture, turning, and curing time provide separate evidence.

Mulch requirements can change around stems, paths, slopes, and irregular edges. Preserve the calculated bulk amount and record any purchase allowance as a separate decision.