Calculate seed rate per hectare in kg/ha and seeds/ha from target plants per m² and seed weight, with typical germination and loss prefilled.

Enter the desired established plants per area. Loss means the fraction of germinated seeds that fail to establish.

Fills blank population and seed weight with example values, not planting recommendations.

Typical seed-tag value. Replace with your seed lot’s tested germination.

100% treats all bulk seed as crop seed. Use the purity on your seed tag.

Typical 5–20% for cereals (Alberta Agriculture). Percent of germinated seeds that fail to establish.

Field totals and cost

When optional, blank omits field totals.

Blank omits cost. A price, including zero, requires planted area.

Related Calculators

Seeds Per Hectare Formula

The following formula gives total crop seeds for an area A in hectares. For seeds per hectare alone, use A = 1. This direct-count formula does not apply a germination or purity allowance.

TS = SR × A × 10,000

Variables:

  • TS is the total number of seeds
  • SR is actual crop seeds per square metre, rather than established plants or bulk seed mass
  • A is the area in hectares
  • Note: 1 hectare is equal to 10,000 square meters

Multiply crop seeds per square metre by hectares and 10,000 to find total crop seeds. In Seed rate from target stand, first divide target plants/m² by [germination fraction × (1 − post-germination loss fraction)]. Bulk kg/ha then equals crop seeds/m² × clean-seed TKW(g) ÷ (100 × purity fraction). Purity is measured by weight and does not increase the count of actual crop seeds. The loss input means the fraction of germinated seeds that fail to establish, not percentage points subtracted from germination.

What is Seed Rate?

Seed rate can be expressed as actual crop seeds per area or as bulk seed mass per area. Clean-seed TKW is grams per 1,000 crop seeds; the alternative seeds/kg and seeds/lb inputs describe clean crop seeds too. Crop targets and seed weights vary by region, field, end use and seed lot. The retained input sets are illustrative examples, not planting recommendations. Germination (90%), purity (100%) and loss (10%) start at typical values; replace them with your seed-lot values.

How to Calculate Seeds Per Hectare?

For the direct-count example below, select Total seeds from area and density. Other tasks solve planting area, seed density, in-row spacing, seed-rate units or establishment-adjusted planning. Blank optional area omits field totals; a supplied price, including zero, requires area. Cost uses the same currency as the entered price and does not convert currencies.

  1. First, enter actual crop seed density (SR) and select its unit.
  2. Next, enter planted area (A) and select its unit. The rectangular spacing model does not subtract paths, margins or headlands.
  3. Next, gather the formula from above: TS = SR * A * 10,000.
  4. Finally, calculate the Total Seeds (TS).
  5. Select Calculate to update the answer. Seed-rate planning also supports row counts, field mass and estimated cost. Optional stand estimation in the conversion task requires germination and post-germination loss. Review field assumptions and round purchases or planter loads appropriately.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Seed rate (SR) = 100 seeds per square meter

Area (A) = 2 hectares. Total seeds = 100 × 2 × 10,000 = 2,000,000 crop seeds. The density remains 1,000,000 crop seeds per hectare.