Garden Planning Calculator

What it is for

This garden planning calculator answers the question every new vegetable-bed owner asks: how many plants fit in my space, and how much water will they need each week? It suits backyard growers, big-balcony gardeners and community plot holders who want to buy the right number of seedlings and size their watering before getting their hands dirty.

How it works

You enter the bed area in square meters, the spacing between plants in centimeters, and the liters of water each plant gets per week. Spacing becomes a square grid: each plant takes spacing times spacing, so the plant count is the area divided by that little square, rounded down. Rows come from the side of an equivalent square bed divided by the spacing, rounded up. Weekly watering is plants times liters per plant.

Worked example

Take a 6 m² bed with seedlings every 25 cm. Each plant occupies 0.0625 m², so 96 plants fit. The equivalent side of about 2.45 m divided by 0.25 m gives 9.8, which rounds up to 10 rows. At 2 liters per plant per week, watering comes to 192 liters weekly.

Limits and caveats

This is plain geometry: it ignores walking paths, odd bed shapes, and the needs of each species, climate and soil. Treat the result as a starting point and check the recommended spacing on the seed packet or with a local grower.

Frequently asked questions

How do I calculate how many plants fit in a garden bed?

Divide the bed area by the area each plant needs. With 30 cm spacing, each plant uses 0.09 m², so 4 m² holds about 44 plants. The calculator does this and rounds down, since you cannot plant half a seedling.

Is plant spacing the same as row spacing?

Here it is: the tool uses the same distance in both directions, forming a square grid. In practice many vegetables want more room between rows than between plants. If that is your case, enter the larger spacing so you do not overestimate how many seedlings to buy.

How do I estimate liters of water per plant?

It depends on the species, plant size, soil and climate, so that number comes from you. Use the crop's recommendation or your own experience and adjust over the weeks. The calculator simply multiplies that figure by the total number of plants.