Plant Spacing Calculator — Garden Bed Plant Count

Calculate how many plants fit your garden bed from length, width, and spacing. Compare square grid vs hexagonal spacing, which fits ~15% more plants.

July 12, 2026

Bed Length (ft)

Bed Width (ft)

Vegetable Preset (fills spacing below, optional)

Plant Spacing (in)

Layout Pattern

Use your own seed packet's spacing recommendation for your specific variety — the preset above is a traditional row-garden average, not a per-variety database.

Plants That Fit

40 plants

Bed area: 40 sq ft at 12 in spacing

Switching to hexagonal/triangular spacing at the same 12 in distance would fit about 46 plants — roughly 15% more than this square grid's 40.

Square Grid: Plants = Bed Area ÷ (Spacing × Spacing). Hexagonal/Triangular: same formula, then ×1.15, since offsetting each row by half the spacing distance packs plants into the gaps a square grid leaves empty. Plant counts are rounded down since a partial plant isn't a real plant. Spacing presets reflect common traditional row-garden distances — always check your own seed packet or transplant tag, since exact spacing varies by variety and growing method (e.g. square-foot gardening uses tighter spacing than traditional rows).

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Reference Values

Last verified: Jul 11, 2026

Category	Range	What It Means	Status
Square Grid Formula	Plants = Bed Area ÷ (Spacing × Spacing)	The traditional row-garden layout. Plants sit at the corners of an imaginary grid, each one the full spacing distance from its neighbors in every direction — simple to mark out with stakes and string, but it leaves unused triangular gaps between plants.	Good
Hexagonal / Triangular Formula ★	≈15% more plants than Square Grid at the same spacing distance	Also called triangular or offset spacing — used in intensive and square-foot-gardening beds. Each row is offset by half the spacing distance, so every plant nestles into the gap left by the row before it, filling the bed more completely for the same spacing value.	★ Best
Tomatoes (staked/caged)	24–36 in traditional row spacing	Wide spacing gives room for airflow around foliage and reduces fungal disease risk. Check your seed packet or transplant tag — determinate bush varieties often tolerate tighter spacing than sprawling indeterminate vines.	Good
Lettuce (head or leaf)	6–12 in traditional row spacing	Loose-leaf types can be crowded toward the tighter end for a "cut and come again" bed; head lettuce needs the wider end to fully form.	Good
Carrots	2–3 in traditional row spacing	Carrots are typically thinned after germination rather than spaced at planting — sow thicker, then thin seedlings to this final spacing once they sprout.	Good
Corn	8–12 in traditional row spacing	Corn is wind-pollinated, so it's normally planted in blocks of multiple short rows rather than one long row, to improve pollination and ear fill.	Good

Source: Square and hexagonal (triangular) spacing formulas per plant-calculator.com's plant spacing methodology, which documents the ~15% plant-count gain from triangular over square spacing at equal spacing distance. Square-foot-gardening spacing convention referenced from gardeninminutes.com's square-foot-gardening spacing chart. Traditional row-garden spacing ranges (tomatoes/lettuce/carrots/corn) reflect common US home-gardening convention — always confirm against your specific seed packet or transplant tag, since spacing varies by variety.

Worked Examples

Small Bed, Square Grid Layout

Bed Size: 10 ft × 4 ft
Spacing: 12 in (custom)
Layout: Square Grid

40 plants

Area = 10 × 4 = 40 sq ft. Spacing = 12 in = 1 ft. Plants = 40 ÷ (1 × 1) = 40.

Tomato Bed, Square Grid Layout

Bed Size: 20 ft × 10 ft
Spacing: 30 in (Tomatoes preset)
Layout: Square Grid

32 plants

Area = 20 × 10 = 200 sq ft. Spacing = 30 in = 2.5 ft. Plants = 200 ÷ (2.5 × 2.5) = 200 ÷ 6.25 = 32.

Carrot Bed, Hexagonal Layout

Bed Size: 8 ft × 4 ft
Spacing: 2.5 in (Carrots preset)
Layout: Hexagonal / Triangular

847 plants

Area = 8 × 4 = 32 sq ft. Spacing = 2.5 in = 0.2083 ft. Square count = 32 ÷ 0.2083² = 737.3 → hexagonal = 737.3 × 1.15 = 847.9, rounded down to 847.

Lettuce Bed, Hexagonal Layout

Bed Size: 6 ft × 6 ft
Spacing: 9 in (Lettuce preset)
Layout: Hexagonal / Triangular

73 plants

Area = 6 × 6 = 36 sq ft. Spacing = 9 in = 0.75 ft. Square count = 36 ÷ 0.75² = 64 → hexagonal = 64 × 1.15 = 73.6, rounded down to 73.

Corn Block, Hexagonal Layout

Bed Size: 15 ft × 15 ft
Spacing: 10 in (Corn preset)
Layout: Hexagonal / Triangular

372 plants

Area = 15 × 15 = 225 sq ft. Spacing = 10 in = 0.8333 ft. Square count = 225 ÷ 0.8333² = 324 → hexagonal = 324 × 1.15 = 372.6, rounded down to 372.

How to Use This Calculator

1

Enter your bed's length and width

Use the inside dimensions of your raised bed or garden row, in feet.
2

Pick a vegetable preset or enter your own spacing

Presets fill in a traditional row-spacing average — for your specific variety, always check your seed packet or transplant tag and enter that number instead.
3

Choose Square Grid or Hexagonal/Triangular layout

Square Grid is the simple stakes-and-string row layout. Hexagonal/Triangular offsets alternating rows to pack in roughly 15% more plants at the same spacing distance.
4

Read your plant count

The result shows how many whole plants fit your bed, plus a side-by-side comparison of what the other layout pattern would fit at the same spacing.

What Each Value Means

Square Grid Plant Count (plants): The number of plants that fit a bed when spaced evenly in straight rows and columns, each plant the full spacing distance from its neighbors in every direction: Plants = Bed Area ÷ (Spacing × Spacing).
Hexagonal / Triangular Plant Count (plants): The number of plants that fit the same bed and spacing distance when alternating rows are offset by half the spacing, letting each plant nestle into the gap left by the row before it. Fits roughly 15% more plants than square grid spacing at the same spacing distance.
Spacing Distance (inches): The minimum distance recommended between the centers of two neighboring plants of the same crop, so each has enough root room, light, and airflow to grow properly. Varies by vegetable and by variety within a vegetable.

Frequently Asked Questions

How many plants fit in my garden bed?

Divide your bed's total area (length × width) by the spacing distance squared: Plants = Bed Area ÷ (Spacing × Spacing). A 10×4 ft bed with 12-inch (1 ft) spacing fits 40 ÷ (1 × 1) = 40 plants in a square grid. Switch to hexagonal/triangular layout in the calculator above to see roughly 15% more plants fit in the same bed at the same spacing distance.

What's the difference between square grid and hexagonal (triangular) spacing?

Square grid lines plants up in straight rows and columns, each one the full spacing distance from its neighbors in every direction — simple to lay out with stakes and string, but it leaves small triangular gaps of unused soil between plants. Hexagonal (triangular) spacing offsets every other row by half the spacing distance, so each plant nestles into the gap left by the row before it. That tighter packing is why hexagonal spacing fits about 15% more plants than square spacing at the same spacing distance, in the same bed area.

Should I trust a generic spacing chart or my seed packet?

Your seed packet or transplant tag, every time. Spacing recommendations vary by variety, not just by vegetable — a determinate bush tomato and a sprawling indeterminate vine both get called "tomatoes," but they have very different space needs. This calculator's vegetable presets are traditional row-garden averages meant as a starting point and a sanity check, not a substitute for the exact number printed on your specific seed packet.

Why would I use square-foot-gardening spacing instead of traditional row spacing?

Square-foot gardening (and other intensive-planting methods) intentionally use tighter spacing than traditional single-row gardens, trading a bit of individual plant size for a lot more total yield per square foot of bed space. Traditional row spacing (like the 24–36 in range for tomatoes used in this calculator's preset) assumes room for a walk-between-rows garden layout; square-foot-gardening methods pack raised beds much closer since there's no walking space to leave between plants. Neither is "more correct" — pick the convention that matches how you're actually gardening.

Does plant spacing affect how big my vegetables grow?

Yes. Spacing too tight forces plants to compete for light, water, and root space, which usually means smaller individual yields per plant even though you've planted more of them — and it increases disease risk in leafy crops like tomatoes and lettuce by trapping humid air around the foliage. Spacing too wide wastes bed space that could be growing more food. The spacing ranges on seed packets are a tested middle ground between total yield and per-plant size for that specific variety.