Plant Spacing Calculator
The Plant Spacing Calculator determines how many plants fit in a garden bed using square, triangular (staggered), or row spacing patterns. Interactive SVG bed visualization shows exact plant positions — a feature an AI chatbot cannot replicate. Includes 16 plant presets and density comparison. Free, no sign-up required.
Plant Presets
Bed & Spacing
Unit System
Pattern
Results
Total Plants
32
Plants per Row
8
Rows
4
Bed Area
32 ft²
Density
1/ft²
Pattern Efficiency
100%
Garden Bed Layout
Plant Spacing Reference
| Plant | Spacing | Row Spacing | Category |
|---|---|---|---|
| Lettuce | 8" | 12" | Vegetable |
| Tomato | 24" | 36" | Vegetable |
| Pepper | 18" | 24" | Vegetable |
| Carrot | 3" | 12" | Vegetable |
| Onion | 4" | 12" | Vegetable |
| Cabbage | 18" | 24" | Vegetable |
| Squash | 36" | 60" | Vegetable |
| Basil | 12" | 18" | Herb |
| Cilantro | 6" | 12" | Herb |
| Rosemary | 24" | 30" | Herb |
| Marigold | 10" | 12" | Flower |
| Petunia | 12" | 12" | Flower |
| Zinnia | 8" | 12" | Flower |
| Sunflower | 18" | 30" | Flower |
| Creeping Thyme | 12" | 12" | Groundcover |
| Clover | 6" | 6" | Groundcover |
Have a suggestion?
Request a new tool or suggest improvements — join our Slack community!
What is a Plant Spacing Calculator?
A plant spacing calculator determines how many plants fit in a garden bed based on the spacing pattern and plant distance. It supports square grid, triangular (staggered), and traditional row layouts. Triangular spacing fits about 15% more plants than a square grid in the same area by offsetting alternate rows. The calculator accounts for edge offsets and generates a visual layout map.
How to Use This Calculator
- Select a plant preset or enter custom spacing distances
- Enter your bed dimensions (length and width)
- Choose the spacing pattern: square, triangular, or row
- Set the edge offset (distance from bed border to first plant)
- View the total plant count, density, and layout visualization
- Compare pattern efficiency — triangular often fits more plants
Frequently Asked Questions
What is the difference between square and triangular plant spacing?
Square spacing places plants in a regular grid with equal distance in all directions. Triangular (staggered) spacing offsets every other row by half the plant spacing, fitting about 15% more plants in the same area. Triangular spacing is better for dense plantings like groundcovers and lettuce.
How do I determine the right spacing for my plants?
Check the seed packet or plant tag for recommended spacing. In general: lettuce 8 inches, peppers 18 inches, tomatoes 24 inches. The calculator includes 16 presets with recommended spacing. Closer spacing increases yield per area but requires more water and nutrients.
What is edge offset and why does it matter?
Edge offset is the distance from the bed border to the first plant. It prevents crowding at edges where soil dries faster and gives plants room to spread. A typical edge offset is 3–6 inches for most vegetables and 1–2 inches for tight plantings like lettuce.
How many plants can I fit in a 4×8 raised bed?
It depends on the plant: about 128 lettuce (8-inch spacing), 32 peppers (18-inch spacing), or 12 tomatoes (24-inch spacing) in a 4×8 ft bed using square spacing. Triangular spacing adds roughly 15% more plants.