Bulb Spacing Calculator
Find how many bulbs fit a planting area.
Plan a dense, even bulb display.
How the Math Works
The Bulb Spacing Calculator uses a simple area division formula: bulbs = total planting area (in square feet) divided by the square of the spacing distance (in feet). This works because each bulb occupies a square space equal to spacing², so dividing the total area by this value gives the number of bulbs that fit without overlapping. For example, a 50 sq ft garden with 1-foot spacing yields 50 bulbs, while 2-foot spacing reduces it to 12.5 bulbs.
Practical Applications
To use this calculator, first measure your planting area in square feet (length × width). Next, determine the recommended spacing for your bulb type (e.g., tulips need 3-6 inches, daffodils 6 inches). Convert spacing to feet, square it, and divide into your total area. This tells you exactly how many bulbs to purchase, ensuring optimal growth while avoiding overcrowding in beds, borders, or containers.
Day-to-Day Use
This tool eliminates guesswork in garden planning, helping you maximize blooms while spending less on bulbs. By calculating spacing precisely, you prevent wasted money on excess bulbs and reduce the risk of disease from overcrowded plants. It also aids in seasonal preparation—knowing bulb quantities helps you buy in bulk during fall sales or plan spring plantings efficiently, making gardening more organized and rewarding.
Worked example
50 ft² at 4 in → ~450 bulbs.
FAQ
Naturalized look?
Increase spacing and scatter randomly for a natural drift.