Lawn Care Calculator

Grass Type sets the baseline nitrogen rate, overseeding rate, weekly water need, and mowing frequency independently, because different grass species genuinely have different growth habits, root depths, and drought tolerance. A fast-growing, thirsty species needs more of nearly everything than a slow-growing, drought-tolerant one, so switching Grass Type moves multiple outputs at once rather than just one.

Yes -- Annual Nitrogen Needed, Overseeding Seed Needed, and both Weekly and Monthly water totals are all computed as a per-square-foot rate multiplied by Lawn Area, so doubling Lawn Area (with grass type, region, and condition unchanged) doubles each of those totals.

Region applies a multiplier to the watering recommendation only -- it does not change the fertilizer, overseeding, or mowing outputs. A hot, arid region like the Southwest gets a higher water multiplier than a humid region like the Southeast or a mild region like the Pacific Northwest, reflecting typically higher evapotranspiration.

Current Lawn Condition only adjusts the Overseeding Seed Needed output: a poor lawn with many bare spots gets the full species overseeding rate, a fair lawn gets 75% of it, and a good, mostly-thick lawn gets 50%, since less bare soil needs new seed. It has no effect on fertilizer, watering, or mowing recommendations in this calculator.

St. Augustine grass is established from sod, plugs, or sprigs, not from seed -- commercially viable St. Augustine seed essentially doesn't exist for home lawns, so this calculator reports zero pounds of overseeding rather than a fabricated seeding rate. To repair thin or bare areas in a St. Augustine lawn, use plugs or fresh sod instead of overseeding.