Plant Spacing & Capacity Planner
Find how many plants fit your space at a given spacing.
Result
Counts assume the entire area is usable canopy. Leave space for access, airflow and pot footprints in real layouts.
History
What it is
This planner works out how many plants fit a given grow area at a chosen spacing, using either a square grid or a triangular (staggered) layout. Triangular packing fits about 15% more plants into the same space than a square grid.
Who should use it
Growers planning a canopy or bed who want to balance plant count against the room each plant needs, and anyone deciding between SOG-style high counts and fewer, larger plants.
How to use it
- Enter the length and width of your usable grow area.
- Enter the center-to-center spacing you want between plants.
- Choose a square or triangular layout.
- Read how many plants fit and the planting density per unit area.
Example calculation
Worked example
A 4 ft × 4 ft area (16 ft²) at 6-inch square spacing fits 64 plants — that is 8 plants per side, 8 × 8 — at a density of 4 plants per ft². Switching to a triangular layout would fit roughly 73 plants in the same space.
Formulas used
Square: n = Area / spacing² • Triangular: n = Area / (spacing² · 0.866)
How to read your result
Higher density means more, smaller plants and a faster canopy (good for SOG); lower density means fewer, larger plants with more training time. Leave walkway and edge space — the result assumes the whole area is usable canopy.
Recommended ranges
| Spacing | Per ft² | Per m² |
|---|---|---|
| 4 in (10 cm) | 9 | ~100 |
| 6 in (15 cm) | 4 | ~44 |
| 8 in (20 cm) | 2.25 | ~25 |
| 12 in (30 cm) | 1 | ~11 |
Common mistakes to avoid
- Planning to the full footprint without leaving room for airflow, access and edge fall-off.
- Using too tight a spacing for plants that will be trained wide.
- Forgetting that pots have a footprint of their own.
- Ignoring that edge plants get less light than centre plants.
Frequently asked questions
How many plants fit in a 4x4 tent?
It depends on spacing and method — anywhere from 1–4 large trained plants to 16+ small plants in a sea-of-green. At 6-inch spacing a 4×4 area holds up to ~64 small plants.
What is the best plant spacing?
It depends on training style and final plant size. Tighter spacing suits many small plants (SOG); wider spacing suits fewer, heavily trained plants.
Does triangular spacing fit more plants?
Yes — staggered (triangular/hexagonal) packing fits about 15% more plants than a square grid at the same spacing.
Should I count the whole tent area?
Use only the usable canopy area. Subtract space for walkways, access and equipment, and remember edges get less light.
More small plants or fewer big plants?
More small plants fill the canopy faster with shorter veg time; fewer large plants need more training but fewer transplants. Both can yield well.