Plant Spacing Calculator
Calculate how many plants fit in a garden bed using square grid or triangular offset planting patterns.
Did this tool work for you?
How to use this calculator
The square grid places plants in rows and columns. Triangular offset planting staggers alternate rows by half a spacing interval, fitting approximately 15% more plants in the same area.
- 1
Enter the length and width of your garden bed in metres.
- 2
Enter the recommended spacing for your plant species in centimetres.
- 3
Choose between square grid or triangular offset patterns.
- 4
Optionally enter plant cost to get a total purchase estimate.
Frequently asked questions
How does the plant spacing calculator count plants?
For the square grid it takes the whole number of spacings that fit along the length, multiplied by the whole number that fit along the width: floor(length ÷ spacing) × floor(width ÷ spacing). Partial spaces at the edges are dropped, never rounded up.
How is the triangular offset count calculated?
The tool multiplies the square-grid count by 1.15 and rounds down. In geometry, staggered rows at an equal spacing fit about 1.155 times as many plants over a large area; this tool uses the flat 1.15 factor, so for a very small bed the figure is only an approximation.
What does area per plant show?
It is the bed area divided by the plant count for the pattern you selected, in square metres. It describes how much room each plant gets on average, and will be larger than the spacing squared when edge space is left over.
In what units do I enter spacing?
Spacing is in centimetres and bed length and width are in metres. A spacing of zero, which is also what a cleared box becomes, falls back to 30 cm, and the smallest value the tool accepts is 1 cm.
Does the tool recommend a spacing for a given plant?
No. You supply the spacing, usually from the seed packet or plant label. The right figure depends on species, variety and growing method, so the tool does not suggest one.
Can it work out cost?
Yes, if you enter a price per plant above zero. The estimated cost is plants needed × price per plant, in dollars. If the price is left at zero, the cost line is not shown.
Why does a bed smaller than the spacing give one plant?
Because the count rounds each direction down, a 1 m by 1 m bed at 60 cm spacing returns 1 plant, one position in each direction. If either side is shorter than the spacing, the count is zero.
Counting plants for a bed from spacing
Rows, columns and partial spaces
In a square grid each plant sits at the centre of a square whose side equals the spacing. Along any edge, you can fit only whole squares, so the calculator rounds down in both directions before multiplying. This counts plants whose full spacing fits inside the bed, which keeps the total realistic if you do not want plants crowded against the boundary. The staggered option layers a flat 1.15 multiplier on top of that count.
Square grid compared with staggered rows
The table runs the same four beds in each pattern, showing how much the staggered setting adds and the average space per plant. Spacing and bed sizes are listed with each row.
| Bed and spacing | Square grid | Triangular offset | Area per plant, square |
|---|---|---|---|
| 2 m × 1 m at 30 cm | 18 | 20 | 0.111 m² |
| 3 m × 1.2 m at 25 cm | 48 | 55 | 0.075 m² |
| 4 m × 1.2 m at 45 cm | 16 | 18 | 0.300 m² |
| 0.6 m × 0.6 m at 20 cm | 9 | 10 | 0.040 m² |
Cost and edge cases
Two other runs show the price line and the rounding at its limits. A 4 m by 1.2 m bed at 45 cm spacing with a $3 plant comes to 16 plants and an estimated $48.00. A 0.6 m square bed at 20 cm spacing and $2.50 per plant yields 9 plants and $22.50. At the other extreme, a narrow 0.5 m by 3 m strip at 30 cm spacing fits 1 plant across and 10 along, so the square grid gives 10, while a 1 m square bed at 60 cm returns just 1.
Why the 3 m bed jumps to 55
In the 3 m by 1.2 m bed at 25 cm spacing the square grid gives 12 plants along the length and 4 across, which makes 48. The 1.15 multiplier raises that to 55 for the offset pattern. Staggered rows push the second row into the gaps of the first, which is why the same area holds more plants. In a real bed you may find the rows land differently near the edges, so lay out string lines before buying. If the result is only one plant short of a tidy layout, adjust the spacing by a centimetre or two and see how the count responds.
What the numbers leave out
The calculator does not know the mature size of any plant, whether plants need more room between rows than within them, or the paths and borders in your layout. Use label spacing for the species, and treat the total as a purchase estimate. Small differences in measured width can change the count by a full row.
Learn more from an authoritative source:
WikipediaWatering Schedule Calculator
Calculate how much water your garden needs per week based on plant type, climate, and recent rainfall.
Pool Volume Calculator
Calculate swimming pool volume in litres, US gallons, and cubic metres for rectangular, round, oval, or kidney-shaped pools.
Compost Ratio Calculator
Calculate the carbon-to-nitrogen ratio for your compost pile and get recommendations for perfect compost.
Garden Bed Area Calculator
Calculate the area and perimeter of rectangular, circular, triangular, or L-shaped garden beds.
Wallpaper Roll Calculator
Calculate how many wallpaper rolls you need for a room, accounting for doors, windows, and pattern repeats.
Fence Stain Calculator
Calculate how much fence stain or paint you need based on fence size, style, and number of coats.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →