Seed Quantity Calculator
Seed packets never say how many you need for your bed, and it is easy to buy five times too many or run out halfway down a row. Give this calculator the size of your bed or container and pick a crop, and it fits the spacing grid for you: how many rows, how many plants per row, and how many seeds to buy once germination rates and the usual losses are allowed for.
Your garden
Using the standard spacing for this crop.
Results
Plants that fit
36plants
4 rows × 9 plants
Seeds to buy
83seeds
Seeds to sow: 72
Plants per m²
12.5m²
- Rows
- 4
- Plants per row
- 9
- Spacing between plants
- 25 cm
- Bed area
- 2.88 m²
Unused strip: 0 cm across, 15 cm along
Figures are typical averages. Your cultivar, soil and microclimate will shift them, so treat the results as a starting point.
How it works
- 1
Enter the width and length of your bed, raised bed or container in centimetres.
- 2
The calculator divides the width by the crop's row spacing and the length by its in-row spacing to lay out a grid.
- 3
The plant count comes from that grid, along with the leftover strip that is too narrow for another row.
- 4
Seeds to buy allows for the crop's typical germination rate plus a fifteen percent margin for thinning, slugs and damping-off — and you can override every number if you know your own.
Frequently asked questions
Save this plan to your garden
Create a free Vegarden account and turn this result into sowing reminders, watering schedules and a harvest log you can come back to.
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- Instant results
Related tools
Other free calculators that pair well with this one.
Container Size Calculator
Find the pot volume, diameter, depth and soil quantity each crop needs.
Open toolPlanting Calendar Calculator
Work out when to sow, transplant and harvest any crop from your frost dates.
Open toolCompanion Planting Checker
Check whether two to four crops get along before you commit them to the same bed.
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