Grass Seed Calculator

Enter the lawn as a length and width or as a square footage, pick the grass and say whether the ground is bare or already has turf on it, and this returns the pounds of seed, the bags to buy and the starter fertiliser that goes down with it. Seeding rates are published per species as ranges rather than single numbers, so the default sits inside the usual range, the range is printed with the answer and the rate itself is an input for when the bag label says something else. A third option works backwards and tells you what the seed already in the shed will cover. Sowing heavier than the rate gives a thinner lawn, not a thicker one, which is the mistake the published rates exist to prevent.