Seed Spacing Calculator
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Divide usable bed length by seed spacing, accounting for edge margins if you set them.
plants per row = floor((bed length - 2 × margin) / seed spacing)Divide bed width by row spacing. Row spacing is usually wider than in-row seed spacing for leafy crops and root vegetables.
rows = floor((bed width - 2 × margin) / row spacing)Multiply plants per row by number of rows. Add a germination buffer if you direct-sow outdoors.
Updated: July 2026
Use 2-inch in-row spacing and 12-inch row spacing to see how many rows fit and how many seeds to buy.
Adjust spacing to balance yield density against airflow and thinning labor for crops like beets or radishes.
Convert packet spacing recommendations into row counts for traditional in-ground beds.
Sow at seed spacing, then thin to the final distance recommended on the packet.
In-row spacing and between-row spacing are different. Both control total plant count and airflow.
Plan your garden rows before you sow. Enter bed dimensions and recommended seed spacing to get plants per row, total rows, and seed count.