Seed Calculator
Calculate how many seeds to buy for your garden based on planting area, germination rate, and desired yield. Avoid wasting seeds or running out mid-season.
Seed Calculator
Typical rates: heirloom ~70–80%, hybrid ~85–95%
Add extra seeds to account for poor germination or thinning.
Seed Requirements
—
Seeds Needed
—
Plants Expected
—
Seed Packets Needed
—
Plants per Sq Ft
—
Thinning Required
—
Estimated Yield
How It Works
This calculator helps you determine exactly how many seeds to buy based on your garden size and crop type. It factors in germination rates and recommended plant spacing.
Key Factors
- Germination Rate: Not all seeds will sprout — older seeds have lower rates
- Spacing: Each crop has optimal spacing requirements
- Transplant vs Direct: Starting indoors reduces seed waste
Seeds Needed = (Plants Required ÷ Germination Rate) × (1 + Extra %)
Plants Required = Planting Area × Plants per Sq Ft