Garden calculators. No guesswork required.

Raised bed soil

Calculate cubic feet, cubic yards, liters and bags of soil for any rectangular raised garden bed.

Mulch

Estimate mulch volume and whole bags from bed area and target depth.

Compost

Estimate compost volume for top-dressing or incorporating into a garden bed.

Container soil

Calculate potting mix for round containers by diameter, height and quantity.

Soil mix ratio

Split a target soil volume into topsoil, compost and aeration components.

Seeds & spacing

5 calculators

Plant spacing

Estimate how many evenly spaced plants fit in a rectangular garden bed.

Square-foot garden

Calculate plant count using square-foot gardening densities.

Seed quantity

Estimate seeds to sow from target plants, germination rate and transplant survival.

Germination rate

Calculate germination percentage and an adjusted sowing multiplier from a seed test.

Seed starting date

Find an indoor seed-starting date by counting weeks before your last frost date.

Water & irrigation

4 calculators

Garden water

Convert inches of weekly water over a garden area into gallons.

Sprinkler runtime

Calculate sprinkler runtime from target water depth and measured application rate.

Drip irrigation

Estimate drip-zone flow and total gallons from emitters, flow rate and runtime.

Rainwater harvest

Estimate gallons captured from roof area, rainfall and system efficiency.

Lawns & landscape

4 calculators

Lawn seed

Estimate grass seed from lawn area and a product-specific seeding rate.

Fertilizer

Calculate fertilizer product needed from area, nitrogen target and the bag's nitrogen percentage.

Garden lime

Estimate lime product and whole bags from area and a soil-test application rate.

Landscape fabric

Estimate landscape fabric area and linear feet with seam overlap.

Season & shelter

4 calculators

Succession planting

Count succession sowings and find the last planting date within a growing window.

Frost cloth

Estimate frost-cloth area and roll length for hoops or low tunnels.

Greenhouse heat loss

Estimate steady-state greenhouse heat loss from surface area, temperature difference and U-value.

Shade cloth

Estimate shade-cloth area and roll length with fastening allowance.