Plant Spacing Calculator: Beds, Rows and Area
Estimate plant counts for a rectangular bed, one row or a known area. Enter the spacing you have chosen for your plants, then compare square and offset layouts and an optional spare allowance.
- Free to use
- No sign-up
- Runs in your browser
Calculate plants needed
Garden Bed Planting Planner
Plan every bed in the garden with automatic plant counts, plus printable grid sheets for square-foot and row layouts.
- Bed-by-bed planting workbook (XLSX, PDF)
- Printable bed grids & spacing chart (PDF, DOCX)
Formats: XLSX, PDF, DOCX. Instant download after payment (link valid 72 hours, up to 5 downloads). AI-assisted: the templates were drafted with AI help and reviewed and laid out before publishing.
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Free printables
Single sheets you can print right now, no sign-up. The full pack adds every sheet in one download plus the editable files.
Spacing and edge examples
| Mode and dimensions | Spacing and edges | Square/row count | Offset count |
|---|---|---|---|
| Area: 100 sq ft | 12 in; 0% extra | 100 | 116 |
| Bed: 10 × 4 ft | 12 in; half spacing at edges; 0% extra | 40 | 38 |
| Row: 10 ft | 12 in; half spacing at ends; 0% extra | 10 | Not used |
| Area: 100 sq ft | 12 in; 10% extra | 110 | 128 |
Area mode ignores edges and rounds up. A small rectangular bed can fit fewer offset plants than square-grid plants because its last staggered row loses positions. The table shows the mathematical count; the current tool differs at the 10% allowance boundary described below.
Choose a mode
- Area: enter square feet and spacing in inches. Useful for approximate density, with no boundary shape.
- Row: enter row length in feet and choose the end gap as a multiple of plant spacing.
- Rectangular bed: enter length and width in feet; optional row spacing is in inches. Zero row spacing uses the square-grid row count.
Rounding and input limits
Spacing must be positive. Negative area, bed dimensions or extra allowance are rejected. The calculator uses ceiling rounding, and binary arithmetic can add one plant at an exact allowance boundary: 100 plants plus 10% currently displays 111 rather than 110. Check exact-boundary allowances separately. Spacing is your input; this tool does not recommend crop spacing, predict yield or assess growing conditions.
Frequently asked questions
Does area mode allow for bed edges?
No. It divides area by nominal space per plant and rounds up. Use the rectangular bed mode for edge gaps.
Does an offset grid always fit more plants?
No. In a small bed, boundaries and alternating rows can reduce the count.
Where should my spacing value come from?
Use spacing appropriate to your chosen plants and growing plan; the calculator only estimates quantities from that value.