Plant Spacing Calculator
Enter bed dimensions and spacing to find how many plants you need.
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How to Space Plants in a Garden
Plant spacing determines both plant health and garden productivity. Too close and plants compete for light, water, and nutrients. Too far apart wastes garden space.
For a grid pattern, divide usable length and width by the spacing distance. For an offset (staggered) pattern, alternate rows are shifted by half the spacing, which fits more plants per area while maintaining the same distance between neighbors.
Plant spacing determines both how many plants fit in a bed and the air circulation that affects disease. Square spacing (grid pattern) gives one plant per (spacing)² sq ft. Triangular/offset spacing fits about 15% more plants in the same area and is better for ground covers.
Common vegetable spacing: tomatoes 18–36 inches (indeterminate varieties need full 36), peppers 18 inches, squash/zucchini 24–36 inches, lettuce 6–8 inches, carrots 2–3 inches in row (thin to 3 after germination), beans 4–6 inches, corn 12 inches in rows 30 inches apart.
The calculator uses the grid formula: plants = (bed length / spacing) × (bed width / spacing), rounded down. For a 4×8 bed with 18-inch tomato spacing: (48/18) × (96/18) = 2.67 × 5.33 = 14.2 → 14 plants maximum in a square grid. In practice, 4–6 tomato plants is more manageable due to pruning and access needs.
Intensive (close) spacing suppresses weeds by shading soil faster but requires richer soil, consistent irrigation, and more frequent harvesting to prevent crowding. Conventional spacing allows better air circulation, reducing fungal disease in humid climates.
See also: Soil Volume Calculator · Fertilizer Calculator