Calculators Lawn area
How big is my lawn?
Almost no lawn is a neat rectangle. Break yours into pieces that are, add a zone for each, and this adds them up. Every fertiliser, wetter and herbicide rate you will ever read depends on getting this roughly right.
You do not need to be exact. Within about five percent is plenty, because the rates on the bag are a range anyway. What you want to avoid is guessing 200m² when it is really 110m², which is the difference between feeding right and feeding double.
Fastest way: Google Maps satellite view, right click a corner, measure distance, click round the perimeter. Good enough for a suburban block and it beats a tape on a hot day.
The longer version
Breaking it into zones
- Split at the obvious lines. A path, a driveway edge or a garden bed usually cuts a lawn into two or three near-rectangles.
- Curved edge? Treat it as a rectangle to the middle of the curve. What you lose one side you gain the other.
- Pace it out if you have no tape. A comfortable adult stride is close to a metre, and you can check yourself against a car or a fence panel.
- Only subtract things sitting in the lawn if they are more than a few square metres.
The app does this and keeps score
This adds up your zones once. The lawn app holds your lawn's details so you never re-enter them, and it tracks the nitrogen you have already put down this year so later doses shrink instead of pushing you over the cap. Free, no account, works offline.