A combine harvester in a ripe wheat crop at sunset
Handy tools

Seeding rate calculator

Turn the plant stand you want into a seeding rate. Enter the target plants, seed weight and your seed test results to get kg per hectare, the seed for the paddock and the bags to order.

Your crop and seed

The plant stand you want - it depends on the crop, district and sowing time.

Thousand seed weight (TSW) - on the seed test or count and weigh 1,000 seeds. It changes between seed lots.

From the germination test on your seed.

Share of germinating seeds you expect to become plants - lower in poor seedbeds or dry, cold sowing.

e.g. a 25 kg bag or a 1,000 kg bulk bag.

Your estimate

78.9kg per hectare
7.89 tseed for 100 ha
8bags of 1,000 kg

Out of every 100 seeds

76 become plants

plant won't make it · germination × establishment

Seeds to sow per m²
197
Seeding rate in lb/acre
70.4 lb/ac
Seed for the whole area
7,895 kg
Link to this rate

How we work it out

  • Seeds to sow: target plants ÷ (germination % × establishment %).
  • kg/ha: seeds per m² × seed weight (g per 1,000) ÷ 100.
  • Seed to order: kg/ha × hectares, bags rounded up.

This is the standard seeding-rate arithmetic, not a recommendation. The right plant stand, sowing depth and time depend on your crop, variety, district and season - check with your agronomist or seed supplier, and calibrate your seeder to the rate. Nothing you type is stored or sent anywhere. Need other units? The seed and fertiliser rate converter does kg/ha ↔ lb/ac.

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