Lawn Care Calculators

Get instant lawn-care answers without leaving your browser. Click the toolbar icon and pick a calculator: • Fertilizer: how much to apply for your grass, lawn size, and season, with NPK and a cost estimate. • Lawn Size: square footage from length x width, plus mower, spreader, and product amounts. • Watering: a weekly schedule tuned to your grass, soil, and irrigation system. • Cost Estimator: a yearly lawn-care budget for your region, DIY vs professional. • Soil Temperature: the current soil temp for your ZIP and what it means for seeding and treatments. Enter your grass type and lawn size once and every calculator remembers them, so you never retype. Copy any result to your clipboard in a click, or open the full tool on whatgrassisthis.com with your inputs carried over. 4 of the 5 tools run entirely on your device. No account, no sign-in, and no browsing data is ever collected. The one online feature (soil temperature) sends only the ZIP code you enter to look up the current reading. Nothing is stored. Built by What Grass Is This?, a lawn-care platform for homeowners across the US.