🌾 Seeding Rate Calculator — Kg per Hectare Calculate the exact seed required per hectare based on your target plant population, seed size, and germination rate. Optimise seeding rates for wheat, barley, canola, and other crops.
Quick answer: Seeding rate (kg/ha) = (Target plants/m² × Seed weight (g/1000 seeds)) ÷ (Germination % × Establishment %). Typical wheat: 80-120 kg/ha. Canola: 3-6 kg/ha.
🌾 Calculate Seeding Rate
Crop Type Custom — enter your own values Wheat (45g/1000 seeds, 200 plants/m²) Barley (48g/1000 seeds, 220 plants/m²) Canola (5g/1000 seeds, 60 plants/m²) Oats (40g/1000 seeds, 210 plants/m²) Triticale (46g/1000 seeds, 210 plants/m²)
Calculate Seeding Rate
📐 How Seeding Rate Is Calculated Seeds per m² = Target Plants ÷ (Germination % × Establishment %) × 100
Set target plant population — based on crop type and growing conditionsAccount for germination — adjust for seed test resultsAccount for establishment — field conditions affect emergenceCalculate kg/ha — convert seeds/m² to kg using seed weight📊 Worked Example Wheat: Target 200 plants/m², seed weight 45g/1000 seeds, germination 95%, establishment 90%.
Seeds per m² = 200 ÷ (0.95 × 0.90) = 234 seeds/m²
If germination drops to 85%, rate increases to 200 ÷ (0.85×0.90) = 261 seeds/m² → 117 kg/ha. Always test seed lots.
❓ Frequently Asked Questions
How do I calculate seeding rate? Seeding rate (kg/ha) = (Target plants/m² × Seed weight) ÷ (Germination % × Establishment %). Example: 200 × 45 ÷ (0.95 × 0.90) = 105 kg/ha.
What are typical seeding rates for common crops? Wheat: 80-120 kg/ha, Barley: 90-130 kg/ha, Canola: 3-6 kg/ha, Oats: 80-110 kg/ha, Field peas: 120-180 kg/ha.
How does germination percentage affect seeding rate? Lower germination means more seed. If target is 100 kg/ha at 95% germination, at 85% you need 100 × (95÷85) = 112 kg/ha. Always get a germination test.
What is the difference between target and actual plant population? Target is what you want. Actual is what emerges. Establishment rate (80-95%) accounts for seedbed conditions, moisture, insects and disease.