🥕 Vegetable Seed Calculator
Plan seed purchases and sowing rates for row gardens using recommended spacing and germination assumptions.
Check seed packet or supplier specs.
How to Use This Calculator
Measure row footage
Total all rows intended for the crop and enter the combined length.
Use recommended spacing
Spacing guides ensure plants have room to mature without thinning.
Account for germination
Order extra seed to offset lower germination rates or seedling loss.
Formula
Seeds Needed = (Total Row Feet × 12) ÷ Spacing
Seeds to Order = Seeds Needed ÷ (Germination% ÷ 100)
Adjust spacing for double rows or broadcast sowing by modifying the spacing input accordingly.
Full Description
Planning seed quantities avoids overbuying while ensuring adequate backup for poor germination or pest damage. Use this tool when mapping succession plantings or CSA crop schedules.
Combine with crop rotation plans and seed inventory tracking to streamline ordering each season.
Frequently Asked Questions
How do I calculate for hill planting?
Multiply seeds per hill by the number of hills instead of using spacing.
What if spacing varies within a bed?
Break the bed into sections and sum seed requirements for each spacing.
Should I round up seed counts?
Yes. Purchase at least one extra packet to account for future succession plantings.
How does thinning affect seed needs?
If you plan to thin, enter closer spacing to ensure enough seeds germinate.