Seed Rate Calculator

Different crops have very different seeds-per-pound counts — this calculator uses roughly 1,450 seeds/lb for corn, 2,500 for soybean, and 12,000 for wheat. Since Seed Rate is pounds needed to reach a target seed count, a crop with far more, far smaller seeds per pound (like wheat) needs a very different weight of seed than one with fewer, larger seeds (like corn), even at similar target populations.

Germination Rate determines what fraction of planted seeds are expected to actually emerge, so the calculator inflates the seeding rate to compensate for the seeds that won't come up. At default settings, dropping Germination Rate from 95% to 55% raises the calculated Seed Rate by roughly 1.7x, since planting enough seed to still hit your target stand at a much lower success rate takes substantially more seed.

No -- the per-acre Seed Rate is calculated before Field Size ever enters the math, so a 160-acre field and a 40-acre field with the same target population, germination rate, and crop type get the identical pounds-per-acre figure; only Total Seed Needed and 50-lb Bags Needed scale up with the larger field's acreage.

No -- keep Target Population as-is if you just want the same per-acre seed rate; Row Spacing only feeds Seeds per Foot of Row, the planter metering figure, and doesn't touch pounds-per-acre Seed Rate at all. If narrower rows are part of a deliberate plan to raise plant population, change Target Population directly -- that's a separate agronomic decision from row width.