Garden Calculator | Perennial Home & Gardens

Raised Bed Soil Calculator

Estimate how much soil or raised-bed mix is needed for a rectangular bed.

Length

Width

Soil depth

Depth unit

Estimate mulch for beds, borders and landscape areas.

Area length (feet)

Area width (feet)

Mulch depth (inches)

Bag size

Estimate compost for top-dressing a garden bed or improving soil before planting.

Bed length (feet)

Bed width (feet)

Compost depth (inches)

Bag size

Estimate the number of evenly spaced plants that fit in a rectangular garden area.

Bed length (feet)

Bed width (feet)

Plant spacing (inches)

Layout

Estimate how many seeds or planting positions fit along rows based on row length and spacing.

Row length (feet)

Number of rows

Seed spacing (inches)

Extra seed allowance

Buy a little extra.Natural materials settle and measurements are rarely perfect. A modest overage helps prevent a second trip.

Measure finished depth.For soil, mulch and compost, use the depth you actually want after spreading—not the height of the bag or pile.

Plant spacing is a starting point.Mature plant width, airflow, light and the variety you grow can change the ideal spacing.