Plant Spacing Calculator — Plants Needed for a Bed

How the plant spacing calculator works

Square-grid density = 144 ÷ spacing². Triangular (offset) layout fits ~15% more plants at the same on-center distance.

Square grid: 100 plants. Triangular: 116 plants.

Triangular looks fuller, uses ~15% more plants, and fills in faster. Square is easier to lay out on a grid.

Gravel

Estimate gravel by area and depth in tons or cubic yards.

Mulch

Estimate mulch in bags and cubic yards for any bed size.

Topsoil

Estimate topsoil in cubic yards and tons for any project.

Sod

Estimate sod in square feet, rolls and pallets.

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