Plant Population / Spacing Calculator
Convert row spacing and in-row spacing into plants per square metre, hectare, acre and optional field total.
Calculate plant population from row and plant spacing
Convert row spacing and in-row spacing into plants per square metre, hectare, acre and optional field total.
How the plant population / spacing calculator works
For rectangular spacing, each plant occupies row spacing multiplied by in-row plant spacing. The reciprocal gives plants per square metre, which is then scaled to hectares and acres.
When to use this farm calculation
Use the calculator to translate a planting geometry into target population, compare alternative row widths, or estimate how many planting positions fit in a field before accounting for germination and establishment.
Inputs, units and assumptions
Spacing must be measured centre-to-centre and expressed in the selected unit. The estimate assumes uniform rectangular spacing and does not model headlands, irregular field boundaries, double rows, skips or mortality.
Practical example
Rows 45 cm apart with plants 20 cm apart produce about 11.11 plants/m², or roughly 111,111 planting positions per hectare.
Translate spacing into a realistic field population
A plant population and spacing calculator gives the mathematical population implied by row spacing and in-row spacing, but the number of established plants can be lower than the number of seeds placed. Germination percentage, emergence losses, skips, doubles, transplant mortality and field conditions all affect the final stand. Use the theoretical population as the starting point for seed ordering and layout, then apply an establishment allowance appropriate to the crop, planting method and local agronomic recommendation.