Seed Spacing Calculator
The Seed Spacing Calculator determines how many plants fit in your garden bed based on seed spacing and row distance. Select from 27 crop presets or enter custom spacing. Features an interactive SVG garden bed layout showing exact plant positions, seed count adjusted for germination rate, and plant density — free, no signup required.
Crop Presets
Spacing & Bed Setup
Spacing Unit
Bed Unit
Planting Results
Total Plants
64
Plants per Row
16
Rows per Bed
4
Bed Area
32 ft² / 2.97 m²
Seeds Needed
64
Seeds (adjusted for germination)
76
Density (per sq ft)
2
Garden Bed Layout
Crop Reference Guide
| Crop | Seed Spacing | Row Spacing | Days to Maturity | Germination % |
|---|---|---|---|---|
| Tomato | 24" | 36" | 70 | 80% |
| Pepper | 18" | 24" | 75 | 75% |
| Lettuce | 6" | 12" | 50 | 85% |
| Carrot | 2" | 12" | 70 | 70% |
| Radish | 2" | 6" | 30 | 90% |
| Bean | 4" | 18" | 60 | 85% |
| Pea | 2" | 18" | 60 | 80% |
| Corn | 8" | 30" | 80 | 85% |
| Cucumber | 12" | 48" | 60 | 80% |
| Zucchini | 24" | 48" | 55 | 85% |
| Broccoli | 18" | 24" | 70 | 80% |
| Cabbage | 18" | 24" | 90 | 80% |
| Spinach | 4" | 12" | 45 | 75% |
| Onion | 4" | 12" | 120 | 75% |
| Garlic | 6" | 12" | 150 | 90% |
| Eggplant | 18" | 24" | 75 | 75% |
| Strawberry | 12" | 24" | 60 | 70% |
| Watermelon | 36" | 72" | 90 | 80% |
| Cantaloupe | 36" | 60" | 80 | 80% |
| Basil | 6" | 12" | 50 | 80% |
| Cilantro | 6" | 12" | 45 | 75% |
| Dill | 6" | 12" | 60 | 70% |
| Parsley | 6" | 12" | 70 | 65% |
| Sunflower | 12" | 24" | 85 | 80% |
| Marigold | 10" | 18" | 60 | 75% |
| Zinnia | 12" | 18" | 60 | 80% |
| Cosmos | 12" | 18" | 50 | 85% |
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What is Seed Spacing?
Seed spacing is the distance between individual seeds or transplants within a row, while row spacing is the distance between parallel rows in a garden bed. Proper spacing ensures each plant gets adequate sunlight, water, and nutrients. For example, tomatoes need 24 inches between plants and 36 inches between rows, while radishes need only 2 inches between seeds and 6 inches between rows. A 4×8 foot raised bed with 6-inch seed spacing and 12-inch row spacing fits about 64 lettuce plants. This calculator handles all the math: enter your bed dimensions and spacing preferences to get exact plant counts, seed requirements adjusted for germination rate, and a visual garden bed layout.
How to Use This Calculator
- Select a crop from the 27 presets or enter custom seed and row spacing
- Enter your garden bed dimensions (length and width in feet or meters)
- Adjust seeds per hole (1-5) and germination rate if needed
- View results: total plants, seeds needed, and plant density
- Check the SVG garden bed diagram showing exact plant positions
Frequently Asked Questions
How do I calculate how many plants fit in a raised bed?
Divide the bed length by seed spacing to get plants per row, then divide the bed width by row spacing to get the number of rows. Multiply these together for total plants. For example, a 4×8 ft bed (48×96 inches) with 6-inch seed spacing and 12-inch row spacing: 96÷6 = 16 plants per row, 48÷12 = 4 rows, total = 64 plants.
What is the difference between seed spacing and row spacing?
Seed spacing (also called in-row spacing) is the distance between individual plants within the same row. Row spacing is the distance between parallel rows. Row spacing is typically wider than seed spacing because it needs to accommodate root spread, air circulation, and access for harvesting. For example, carrots need 2-inch seed spacing but 12-inch row spacing.
How does germination rate affect seed count?
Germination rate is the percentage of seeds that successfully sprout. If you need 100 plants and the germination rate is 80%, you should plant 125 seeds (100 ÷ 0.80 = 125). Lower germination rates mean you need more seeds to achieve your target plant count. The calculator automatically adjusts the seed requirement based on the germination rate you enter.
Should I use square foot gardening spacing or traditional row spacing?
Square foot gardening uses tighter, grid-based spacing without traditional rows, which maximizes yield per area. Traditional row spacing leaves wider paths between rows for access and airflow. For raised beds under 4 feet wide, square foot gardening works well. For larger plots or crops needing more space (corn, squash), traditional row spacing is more practical. This calculator uses traditional row spacing by default.