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Plant Population Calculator

Calculate estimated plants per square metre from sowing rate, thousand-grain weight, germination and establishment rates.

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Sowing rate and TGW must be greater than 0 and no more than 10,000. Germination and establishment must each be from 0% to 100%.

Calculation only: all agronomic parameters are supplied by you; no rate or crop recommendation is made.

P = (S × 100 ÷ W) × (G ÷ 100) × (E ÷ 100)

Source: ToolFoundry

Enter values and calculate.

A QUICK WALKTHROUGH

How to use this tool

  1. Enter the sowing rate and thousand-grain weight.
  2. Enter your germination and establishment percentages.
  3. Calculate and review the arithmetic estimate and its limitations.

Formula and units

Seeds/m² = sowing rate (kg/ha) × 100 ÷ TGW (g). Germinated seeds/m² = seeds/m² × germination rate. Plants/m² = germinated seeds/m² × establishment rate.

Arithmetic only

All four inputs are user-supplied. This calculator does not recommend a sowing rate, TGW, germination rate, establishment rate, crop, variety or agronomic practice. Field population may differ.

Source

Independent arithmetic implementation. The ToolFoundry source interface was reviewed on 6 October 2026.

GOOD TO KNOW

Common questions

Does this choose suitable agronomic values?

No. It only applies the formula to values you provide. Inputs stay in this browser and are not uploaded or stored.

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