Grass Seed Calculator

A grass seed calculator determines the amount of seed required to establish or overseed a lawn. Seeding rates vary by grass species and whether you are creating a new lawn or overseeding an existing one (which requires less seed)

The calculator uses the standard published formula for grass seed. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, square metres, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Total seed = Area × Application rate. Each step in the calculation is shown so you can verify the result manually.