Garden Plant Quantity Calculator — Plants to Fill a Bed
~15 seconds
Enter the garden area you want to fill and the spacing between plants. The calculator estimates how many plants you need to buy or start.
What this calculator determines
It estimates how many plants are needed to fill a garden area at a chosen spacing, assuming a grid layout.
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Examples
32 sq ft, 12 in spacing
32 sq ft, 12 in apart
Calculation
- Spacing: 12 in = 1 ft → 1 sq ft per plant
- Plants: 32 ÷ 1 = 32 plants
32 plants needed
Assumptions & Conventions
- Grid layout
- Plants = floor(area ÷ spacing²); spacing is treated as equal in both directions.
- Buffer
- The headline count is the exact geometric minimum; a 10% buffer is shown separately for losses — add it if you want spares.
- Spacing source
- Use the spacing recommended on your seed packet or plant tag.