Examples
Examples
Try the starting example
- Target surviving plants
- 1000
- Cells per tray
- 100
- Expected germination (%)
- 90
- Expected loss after germination (%)
- 20
- Minimum seeds before tray rounding
- 1389
- Whole trays
- 14
- Seeds if every purchased cell is sown
- 1400
- Expected surviving plants from full trays
- 1,008
- Expected surplus plants
- 8
Try another scenario
- Target surviving plants
- 100
- Cells per tray
- 60
- Expected germination (%)
- 100
- Expected loss after germination (%)
- 0
- Minimum seeds before tray rounding
- 100
- Whole trays
- 2
- Seeds if every purchased cell is sown
- 120
- Expected surviving plants from full trays
- 120
- Expected surplus plants
- 20
Calculation method
Calculation method
Minimum seeds before tray rounding
Round up target / (germination fraction × retained fraction after loss).
Whole trays
Round up minimum seeds / tray cells.
Seeds if every purchased cell is sown
Trays × cells.
Expected surviving plants from full trays
Fully sown cells × assumed survival fraction.
Expected surplus plants
Expected full-tray survivors − target.
Symbols and units
- a
- Target surviving plants
- b
- Cells per tray
- c
- Expected germination (%)
- d
- Expected loss after germination (%)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- A planning expectation using supplied germination and post-germination losses, not a guarantee of surviving plants. Shows the minimum seed count separately from sowing all cells in whole trays. Timing, seedling suitability and uncertainty intervals are not supplied.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
University of Minnesota Extension: planting equipment calibration ↗
Background reading; this does not imply endorsement or independent review of SumFizz.