Planting Density and Seed Rate
Seeds and pounds per acre from row spacing, target population, germination, and seed price.
Example
You enter
- Row width (in) 30
- Target population / acre 32000
- Seeds per lb 1500
- Germination % 95
- Seed price ($/lb, optional) 4.5
You get
- Seeds / acre 33,684
- Lbs / acre 22.46
- Cost / acre $101.05
Checked against published worked examples from: Purdue University Cooperative Extension Service.
Details, formula, and sources
Formula or tableSeeds per acre = target_population_per_acre / germination_pct. Lbs per acre = seeds_per_acre / seeds_per_lb. Cost = lbs × $/lb.
Source and editionUSDA Cooperative Extension published seeding-rate guides (Purdue AY-217, Montana State) by name.
Free accessUSDA Extension materials free at most state-extension-service sites.
What governsRead and follow the product label. The label is the law (FIFRA).
API field namesrow_width_in, target_pop_per_acre, seeds_per_lb, germination_pct, seed_price_per_lb, seeds_per_acre, lbs_per_acre, cost_per_acre