Vegetable Seed Calculator

Your details

Choose whether you measure your rows in feet or metres.
Select your crop. The seed-to-seed spacing is pre-filled from extension-service recommendations. Choose "Custom spacing" to enter your own value.
Length of one row in your garden.
ft
How many parallel rows you plan to plant.
rows
Extra seeds to buy as insurance against poor germination. 10-20% is typical; increase to 25-30% for slow germinators like parsnip or pepper.
%
Check the seed packet. Used to calculate how many packets to buy.
seeds
Price of one seed packet. Leave at 0 to skip the cost estimate.
USD
Seeds to plantSmall planting
30seeds

Total seeds for all rows, rounded down per row then multiplied.

Seeds to buy (with buffer)35seeds
Transplant seedlings needed15seedlings
Seedlings to start (with buffer)18seedlings
Seed packets to buy1packets
Estimated seed cost4.5USD
Seed spacing used12in
Seedling spacing used24in
Seeds to plant30
Seeds to buy (with buffer)35
Seedlings needed15
Seedlings to start18

30 seeds needed across all rows.

  • You need 30 seeds to fill 3 rows of 10 ft with Tomato.
  • Adding a 15% germination buffer brings your buy quantity to 35 seeds (1 packet).
  • If you prefer to transplant, start 18 seedlings indoors to end up with 15 in the ground.
  • Estimated seed cost: $4.50 at your entered price per packet.

Next stepCheck your last frost date and count back by the crop's days-to-transplant to set your indoor sowing date, or direct-sow outdoors after frost risk passes.

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