The lawn math, free and without the runaround.
Five tools we built for our own app and put out front. They run in your browser, they don't ask who you are, and they show their work.
- LIVE
Fertilizer calculator
Start from the nitrogen rate you actually want, not the bag. Get bags to buy, real lb N per 1,000, coverage, and cost per pound of N.
- N-first inputs, bag math locked
- Guardrails on rates that burn
- Every step shown, not hidden
- LIVE
Spray mix calculator
Tank size, carrier volume, and whatever's going in. We split the job across tanks and tell you what to pour into each one, in the order it goes in.
- Split across tanks, finish tank measured
- Numbered pour order, dry first
- Label ranges enforced, loudly
- LIVE
Hardiness zone lookup
Your zone off the 2023 USDA map from a ZIP, city, or address, plus the part nobody prints: what the zone number can't tell you about your grass.
- PHZM 2023, with the winter low
- Species and timing by turf region
- Transition-zone straight talk
- LIVE
Yard measurement
Trace your lawn on satellite imagery and get square footage you can trust. It's the number every other calculation here depends on.
- Trace each lawn zone on satellite imagery
- Square feet, acres, and thousands
- Feeds the fertilizer calculator
- LIVE
Product catalog
Every product we track, what it actually costs per 1,000 ft², and the 90-day low so you know whether today is a buying day.
- Cost per 1,000 ft², not the shelf price
- 90-day low on every tracked listing
- Same catalog the app uses
Reference
Lawn grass typesAll ten common lawn grasses compared — zones, mowing height, nitrogen, shade and traffic, and who each is actually for.Compare the ten →Why these are free
Because they're the parts of lawn care that shouldn't be behind a form. The tools answer one question each. The app is what strings the answers into a season.
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- fields before an answer
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- addresses stored
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- shared engine with the app
The tools answer one question. The app runs the season.
Knowing your rate is easy. Knowing the week is the hard part.
LawnDominator tracks your 2" soil temperature and growing degree days and tells you when your pre-emergent window opens, when the last application ran out, and what to put down next.
No card to start. Your tool inputs carry over.
What you get that a calculator can't do
- A live GDD clock per zone, not a calendar
- PGR rebound tracking and the next window
- Product inventory and what's left in the bag
- Every application logged against the weather it ran in