Grass Seed Calculator

In whatever rate unit you work in: lb/acre, kg/ha or seeds per area. The output uses the same unit.
Pure seed percentage from the lot label.
Feet in US units, metres in metric. 17.424 ft at 30 in rows is exactly 1/1000 acre.
Inches in US units, metres in metric.
Bulk seeding rate required
13.586957
Seeding Rate and Pure Live Seed Calculator
Pure live seed
73.6 %
Increase over the target rate
35.869565 %
Units used
lb/acre or seeds/acre
Worked out from Penn State Extension, Calculating the Price of Pure Live Seed and 2 other sources.

How this is worked out

3 steps
  1. Pure live seed = purity x germination / 100 = 92 x 80 / 100 = 73.6%
  2. Bulk rate = target x 100 / PLS = 10 x 100 / 73.6 = 13.586957
  3. That is 35.87% more seed than the target rate, to allow for impurity and non-viable seed.

Results are general information, not financial, tax, legal, medical or engineering advice.