Seed Rate Calculator

Select your crop, enter field size and target plant population to calculate seeding rate in pounds per acre.

%

87.0

lbs per acre

3478

total lbs for 40 acres

Wheat at 1,200,000 seeds/acre with 92% germination:

  • • Adjusted seeding rate: 1,304,348 seeds/acre
  • 87.0 lbs/acre (97.4 kg/ha)
  • 3478 lbs total (69.6 bags at 50 lbs)

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FAQ

How do I calculate seed rate per acre?

Seed rate (lbs/acre) = Target population (seeds/acre) / Seeds per pound / (Germination rate / 100). For example, wheat at 1,200,000 seeds/acre with 15,000 seeds/lb and 92% germination = 87 lbs/acre.

What is a good germination rate?

Most commercial seed has 85-95% germination. Check your seed bag label for the tested rate. Lower germination means you need to plant more seed to hit your target population.

How many seeds per pound for common crops?

Wheat: ~15,000. Corn: ~1,500. Soybeans: ~2,500. Barley: ~13,000. Canola: ~130,000. These vary by variety, so check your seed supplier's data.

Does seeding rate affect yield?

Yes — both under- and over-seeding reduce yield. Too thin = weed pressure and poor canopy closure. Too thick = competition between plants and lodging. Optimal population depends on your soil, climate, and variety.

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