Plant Spacing Calculator
Work out how many plants fit in a bed at a given spacing, in rows or in a grid.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
The grid estimate counts whole planting positions from bed dimensions and spacing. Staggered layout adds an approximate 15% and rounds up; actual capacity depends on mature plant spread and access.
Worked example
calculated with the default values below
Bed length 8 ft · Bed width 4 ft · Spacing between plants 12 in · Layout Grid (square foot style) · Row spacing (rows layout) 18 in Bed area 32.0 sq ft · Plants across the width 4 · Plants along the length 8 · Total plants 32 · Plants per square foot 1.00 pcs · Note Ensure every plant can reach its mature spread without crowding its neighbour
General background references
Disclaimer
These are general gardening estimates. Planting windows, growth, water and nutrient needs vary by place and plant. Check local extension guidance and product labels before acting on an estimate.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
N = ⌊W × 12 ÷ s_w⌋ × ⌊L × 12 ÷ s⌋
- N
- Total plants
- W
- Bed width (ft)
- L
- Bed length (ft)
- s
- Plant spacing (in)
- s_w
- Cross/row spacing (in)
Staggered layout: N × 1.15 (floored); 1 ft = 12 in.
Frequently asked questions
How does the staggered layout affect the count?
The estimate multiplies the rectangular grid count by 1.15 and rounds up. For an 8 × 4 ft bed with 12 in spacing, the grid is 8 across by 4 along (32 plants), so the staggered estimate is 37. This is a planning heuristic; leave room for mature plant spread.