Seed Spacing Calculator
Plants per row and per bed from your spacing plan.
Enter your values
ⓘ Live results
Results
- Total plants
- 105
- Plants per row
- 21
- Number of rows
- 5
- Seeds to sow
- 124
- Density
- 2.63 plants per sq ft
Working
- 121 per row x 5 rows = 105 plants
Quick answer
Plants per row = row length divided by in-row spacing, plus one. Rows = bed width divided by row spacing.
plants = (row length / spacing + 1) x (bed width / row spacing)
How to use the Seed Spacing Calculator
- 1Enter the bed size and the spacing recommended on the seed packet.
- 2Row spacing can be tighter in raised beds than in field rows.
- 3Sow extra seed to allow for the germination rate you enter.
Worked example
Using the values the calculator loads with:
Inputs
- Bed length10 ft
- Bed width4 ft
- In-row spacing6 in
- Row spacing12 in
- Germination rate85 %
Results
- Total plants105
- Plants per row21
- Number of rows5
- Seeds to sow124
- Density2.63 plants per sq ft
- 21 per row x 5 rows = 105 plants
Frequently asked questions
Can I plant closer than the packet says?
In rich raised-bed soil, yes - square-foot gardening spacings work well. In poor soil, crowding just gives you smaller plants.
Why sow more seed than plants I need?
Germination is never 100%, and thinning to the strongest seedlings gives a better crop than replanting gaps.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.