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Plant Spacing Calculator

Ready to calculate
Square + Triangular Grid.
Density Optimization.
Cost Estimation.
100% Free.
No Data Stored.

How it Works

01Enter Bed Dimensions

Provide length and width of planting area.

02Set Spacing

Plant-to-plant spacing in inches or centimeters.

03Square or Triangular

Triangular packs ~15% more plants at same minimum distance.

04Plant Count + Cost

Get total plants with optional unit-price total.

What is a Plant Spacing Calculator?

The Plant Spacing Calculator tells you exactly how many plants fit in a given garden bed using either square (rectangular) spacing or triangular (offset) spacing. Triangular spacing fits ~15% more plants in the same area without crowding — used by commercial growers and intensive gardeners (square-foot gardening, biointensive, market gardening).


Inputs are bed dimensions (length × width) and the spacing distance between plant centers. Output is the total plant count plus the number of rows and per-row plant counts. Designed for vegetable gardeners, landscape designers, and market growers who need to order seeds or transplants for a specific bed footprint.

How to Use the Calculator

Enter bed length and width: in feet, inches, or meters. Calculator handles unit conversion.
Enter plant spacing: the recommended distance between plant centers (from seed packet or extension guide).
Pick layout: Square grid is simpler; triangular fits more plants but requires staggered rows.
Calculate: Returns total plant count, rows, and per-row counts.
Order accordingly: Add 5–10% for seedling losses or replacement plantings.

The Math Behind It

Square spacing: rows = floor(width / spacing) + 1; plants/row = floor(length / spacing) + 1; total = rows × plants/row.


Triangular spacing: row_spacing = spacing × √3/2 ≈ spacing × 0.866; rows = floor(width / row_spacing) + 1; alternate rows offset by spacing/2; total ≈ 1.155 × square count for the same area.

Real-World Example

Worked Example

4 ft × 8 ft raised bed, lettuce at 12 in spacing:

  • Square: 4 rows × 8 plants/row = 32 lettuces
  • Triangular: row spacing = 10.4 in → 5 rows; alternating 8 and 7 plants → ~37 lettuces (+15%)

Who Uses It

1
🥬 Market Gardeners: Maximize plant density for revenue per bed.
2
🏡 Home Gardeners: Match seed orders to actual bed capacity.
3
🌷 Landscape Designers: Plan groundcover and perennial installations.
4
🌱 CSAs: Forecast yields per share from planted square footage.
5
📐 Square-Foot Gardening: Convert SFG plant-per-square recommendations into bed totals.
6
🍓 Strawberry Patches: Plan matted-row vs hill systems with different spacing.

Technical Reference

Recommended spacings (in-row × between-row):

  • Lettuce: 8–12 in
  • Tomato: 24 in (determinate) – 36 in (indeterminate)
  • Pepper: 18 in
  • Carrot: 2 in × 12 in
  • Onion: 4 in × 8 in
  • Broccoli/Cabbage: 18 in
  • Bush bean: 4 in × 18 in
  • Squash: 36–48 in
  • Strawberry (matted row): 18 in × 36 in

Key Takeaways

Triangular spacing fits ~15% more plants than square for the same recommended center-to-center distance, without crowding. Use the recommended spacing on the seed packet — tighter spacing reduces yield per plant and increases disease pressure. Always add 5–10% margin for losses.

Frequently Asked Questions

Square vs triangular — which should I use?
Triangular fits ~15% more plants per area without reducing the center-to-center distance. Use triangular when bed efficiency matters (market growing, small intensive plots). Use square when you need clear walking paths between rows or mechanical cultivation.
Should I subtract path width?
Yes if your bed includes walking paths. Enter only the planted area (typically 30–48 in wide for raised beds, leaving 18–24 in paths between beds).
Can I use this for trees and shrubs?
Yes — same formula. Use the mature canopy spread as the spacing for ornamental plantings, or check your hedge/orchard spacing recommendation (typically 6–10 ft for fruit trees on dwarfing rootstock).
What about square-foot gardening?
SFG uses 1 sq ft cells with 1, 4, 9, or 16 plants per cell. Convert to spacing: 4/cell = 6 in spacing; 9/cell = 4 in; 16/cell = 3 in. Then use this calculator with the spacing input.
Does the calculator handle irregular beds?
No — current version is for rectangular footprints. For L-shapes, divide into rectangles and add. For circles, use πr² for area and divide by spacing².
How much margin for losses?
Direct-seeded crops: 10–20% extra (germination losses). Transplants: 5–10% (transplant shock, slug damage). Always have a few backups.

Author Spotlight

The ToolsACE Team - ToolsACE.io Team

The ToolsACE Team

Our specialized research and development team at ToolsACE brings together decades of collective experience in financial engineering, data analytics, and high-performance software development.

Software Engineering Team

Disclaimer

Spacings are general guidelines. Local growing conditions, soil fertility, and variety vigor affect optimal spacing — consult your regional extension service for site-specific recommendations.