Plant Spacing Calculator

Divide your bed's area by the spacing distance squared: area (sq ft) / (spacing in ft x spacing in ft) gives the plant count for a square grid. Enter your bed size and a spacing distance above and this calculator does that math for you, plus a triangular-pattern option that fits more plants at the same spacing.

It depends on your bed size and how far apart each plant needs to be -- there's no single number. Enter your bed's length and width (or its area) and pick a plant or a custom spacing above for a count specific to your project.

It varies widely by crop, from 1-2 inches for thinned carrots or lettuce up to 60 inches for watermelon vines. Per Clemson Cooperative Extension's planting chart, tomatoes need about 24 inches, peppers about 18, and cabbage about 12 -- pick your plant from the preset list above for the sourced number.

At 12-inch spacing on a square grid, that's 1 plant per square foot. Tighter spacing fits more -- lettuce at 2-inch spacing packs roughly 36 plants per square foot on a grid, or about 42 with triangular spacing. Enter your specific spacing above for an exact count.

It's a planting pattern where every other row is shifted sideways by half the spacing distance, so each plant is surrounded by six neighbors instead of four in straight rows. Because the rows pack closer together (to about 86.6% of the normal row spacing) without putting any two plants closer than the minimum distance, a triangular layout fits roughly 15.5% more plants than a square grid at the same spacing.

Yes -- it's basic hexagonal-packing geometry, not a marketing claim. The row-to-row distance in a triangular pattern is spacing x sin(60 degrees), about 86.6% of a square grid's row spacing, which works out to about 15.5% more plants in the same area at an identical minimum on-center distance.

Row spacing (the walking aisle between rows) is usually wider than in-row plant spacing to leave room to work the bed -- Clemson's chart lists 30-36 inches between rows for most vegetables, versus much tighter in-row spacing. This calculator uses the in-row number, since that's what determines how many plants fit a block-planted bed.

A 4x8 bed is 32 sq ft. At the standard 24-inch tomato spacing, a square grid fits about 8 plants and triangular spacing fits about 9. Enter 4 ft x 8 ft above with tomatoes selected to see the exact count -- though most gardeners plant tomatoes in fewer, well-spaced rows rather than a tight grid, since they need room for cages or stakes.

Square-foot gardening uses a fixed 1-ft grid and assigns each square a set number of plants by crop (1 tomato, 4 lettuce, 9 beans, 16 carrots per square) rather than a continuous spacing calculation. This calculator instead works from your plant's real on-center spacing and bed size, which is more accurate for beds that aren't gridded into exact 1-ft squares.

That's walkway space, not plant spacing, and this calculator doesn't cover it -- most gardeners leave 18-36 inches between beds for a wheelbarrow or comfortable kneeling room. Check our raised bed soil calculator for filling the beds themselves.

The grid and triangular math works for any plant at any spacing -- enter a custom spacing in inches (convert feet to inches first, e.g. a 6-ft shrub spacing is 72 inches). The preset list here focuses on vegetables since that's where sourced, plant-specific spacing data is easiest to verify; for trees, see our tree spacing guidance from a certified arborist instead.

The first number is usually between-row spacing and the second is in-row spacing -- for example, tomatoes at '36 x 24' means 36 inches between rows and 24 inches between plants within a row. This calculator's presets use the in-row number, since it's the tighter distance that determines total plant count.

No -- planting tighter than the recommended distance increases competition for light, water and nutrients, which can reduce individual plant size and yield even though plant count goes up. The spacing values above are extension-recommended minimums for healthy plants, not a floor to push below.