Garden & outdoors
Seed tray planner
Estimate trays and seeds for a target number of seedlings.
A clear answer. Here’s how.
Required cells = target seedlings ÷ expected successful-cell percentage, rounded up. Seed count = occupied cells × seeds per cell; trays round up to whole trays. The percentage represents your expected successful cells, not an independent probability calculation for each seed.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Target seedlings
- 100
- Expected germination (%)
- 80
- Cells per tray
- 40
- Seeds per cell
- 1
Example result
- Occupied cells
- 125
- Whole trays
- 4
- Seeds to sow
- 125
- Unused tray cells
- 35