Flower Bulb Planting Calculator — Bulbs Needed for a Bed
Enter the area of your planting bed and the spacing you want between bulbs. The calculator estimates how many bulbs you need. Use the spacing recommended for your specific bulb type.
What this calculator determines
It estimates how many bulbs are needed to fill a bed at a chosen bulb spacing, assuming a grid layout.
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Examples
24 sq ft, 6 in spacing
24 sq ft, 6 in apart
Calculation
- Spacing: 6 in = 0.5 ft → 0.25 sq ft per bulb
- Bulbs: 24 ÷ 0.25 = 96 bulbs
96 bulbs
Assumptions & Conventions
- Grid layout
- Bulbs = floor(area ÷ spacing²); assumes a grid, not a naturalized drift pattern.
- Buffer
- The headline count is the exact geometric minimum; a 10% buffer is shown separately for extras.
- Spacing source
- Use the spacing recommended on your bulb package — it varies by bulb type and size.