Seed Spacing Calculator
Use this seed spacing calculator to estimate how many seeds you need for your garden.
Enter your row length or garden dimensions and seed spacing to get the exact number of seeds required.
Calculation Method
Results
Pro tip: Add 10-20% extra seeds for germination failure and thinning.
Detailed Explanation
🎯 Purpose
This seed spacing calculator helps you estimate how many seeds you need for your garden. It can calculate by row or by total garden area.
📝 How to Use
1. Choose calculation method: by row or by area. 2. By row: enter row length and seed spacing. 3. By area: enter garden width, length, seed spacing, and row spacing. 4. The calculator will show you how many seeds you need per row and total.
🔢 Algorithm
By row: Seeds per row = (Row length in feet × 12) ÷ Seed spacing in inches By area: Number of rows = (Garden width in feet × 12) ÷ Row spacing in inches Seeds per row = (Garden length in feet × 12) ÷ Seed spacing in inches Total seeds = Number of rows × Seeds per row
💡 Why do it this way?
Why leave spacing between seeds? - After germination, seedlings need room to grow. Too crowded means they shade each other out, stems grow thin and leggy (etiolation), and they topple over easily. - Roots also need space — too crowded means roots tangle and compete for water and nutrients. - With enough spacing, seedlings grow strong, and you have flexibility when thinning (pull the weak ones, keep the strong ones). It's recommended to plant 20% extra seeds, because not every seed germinates and you need extras for thinning. 📚 Sources: • USDA Seed Planting Guide: https://www.nal.usda.gov/programs/whats-backyard-gardening • Rutgers University Extension: https://njaes.rutgers.edu/fs1220/