Public tool
Seed packet calculator
Same usable-seed math PlantIt uses in shopping: subtract on-hand supply first, then round up only the remaining retail packets. Weight-only packets stay unknown — we will not invent a seed count.
Partial packs count (e.g. 0.5 = half a packet).
You are covered
- Retail packs if starting from zero:
- 1
- Still to buy after on-hand:
- 0
Example: 10 plants, 50 seeds/pack, 100% germ, half a pack on hand → 0 packets to buy. PlantIt never rounds partial supply away before that check.
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