Garden Plant Spacing Calculator

How to use

1. Measure the bed and enter it in the Bed length (m) and Bed width (m) fields.
2. Read the Plant spacing (cm) value off the seed packet or plant label and enter it (the default is 30 cm).
3. Press Calculate / Generate to see the plant count and the grid, for example 11 x 4.
4. Interpret the grid numbers: plants per row along the length, times the number of rows across the width.
5. Remember the count includes a plant at each edge - that is the extra position added in both directions.
6. Buy a few spare seedlings as insurance, and re-run the numbers for every different crop spacing you plan to grow.

About this tool

Square-foot grid planting: one plant per spacing square, counted across both axes — the standard kitchen-garden layout method.

Ordering seedlings without a layout is how gardeners end up short at planting time or with a tray of leftovers. This calculator uses the standard grid method: your bed is treated as rows and columns, the length and width you enter are each divided by the plant spacing, and one extra position is added in each direction so the edges get a plant too. Enter the bed size in the Bed length (m) and Bed width (m) fields and the packet value in the Plant spacing (cm) field to get a total plus a grid such as 11 x 4.

Take the spacing number straight from the seed packet or plant label, because it reflects how much room the mature plant needs; crowding invites disease and competition, while extra room wastes bed space. The tool assumes a rectangular bed planted with a single crop in straight rows, so staggered layouts, curved beds, or mixed plantings need your own adjustment. A common habit is to buy about ten percent more seedlings than the count, as germination and transplant losses are normal. Re-run the numbers for each crop, since spacing is what changes most between vegetables and flowers.

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