About LawnCareKit

LawnCareKit is a collection of free calculators for taking care of a lawn without an agronomy degree. Lawn advice mostly comes as university extension PDFs written for turf professionals or product labels that assume you already know what "1 lb N per 1,000 sq ft" means. The actual math is simple — someone just has to show it plainly.

Every tool here shows its formula and a worked example, so you can verify the number before you spread, spray, or seed. Nothing is stored or sent anywhere — the calculators run entirely in your browser.

Dosing rates come from university extension publications and product label standards. Where a label and this site could ever disagree, the label wins — especially for anything you spray.

Some product links go to Amazon; as an Amazon Associate,LawnCareKit earns from qualifying purchases. That never changes a dose — the math is the math.