Measure the grass you want mowed
Count only mowable turf, not the whole lot. One buying guide suggests you buy 20 to 40 percent more rated capacity than you think you need. It puts simple, open lawns near 20 percent extra and steep, divided or obstacle-heavy yards at 30 to 40 percent. In its examples, a flat 0.25 acre lawn pairs with a 0.3 to 0.4 acre rating. A rough, sloped 0.75 acre lawn pairs with 1 acre or more.
Capacity ratings assume the mower runs around the clock. A Husqvarna guide notes that if you limit mowing to certain hours, your effective coverage drops. Plan for that if you want quiet nights.
Robots also have a practical ceiling. One garden publication says robot mowers typically top out at about 2 acres. Past that, you are looking at commercial machines.
Measure your steepest slope
Find the steepest part of the lawn and compare it with the maker's slope rating. The rating should sit comfortably above your measurement. Also check slopes near the boundary and on the route back to the dock. Our slope guide explains percent, degrees and drive types.
Husqvarna says all Automower models manage slopes of at least 25 percent and recommends all-wheel drive for steep ground.
Match navigation to your yard
Your sky view and tree cover matter most here. A mower that needs open sky for satellite positioning will struggle under heavy canopy. One review site advises that open sky suits RTK, while heavy tree cover calls for LiDAR, vision or a hybrid. Boundary wire works regardless of sky but takes time to lay. Read the full navigation comparison before you decide.
Check passages and obstacles
Measure your narrowest gap, including mower width and turning room. Husqvarna's manual says to leave a passage of at least 60 cm (24 in) between boundary wires. It also says to run a guide wire through any passage narrower than 2 m (6.5 ft).
Count your separate lawn zones too. If grass areas are not connected, you may have to carry the mower between them. Confirm the model supports that many zones and schedules.
Remember that robots miss things. One guide warns that robots can't detect obstacles such as toys or dog waste. Clear the lawn before each run.
Plan for connectivity
Most setups need an app. One RTK mower's manual says Wi-Fi or a hotspot is needed for activation, upgrades and remote status. The same manual says mapping, scheduling and mowing then work without internet. If Wi-Fi does not reach the dock, look for a model with a cellular option. Our setup guide covers this in detail.
Budget for price and upkeep
The same garden publication puts robot mowers at $500 to $2,500, with most around $1,000. Add running costs. One guide lists replacement blades, wheel cleaning, storage, firmware support, battery aging and possible installation or repair as ongoing items.
Robot mowers usually leave clippings on the lawn. That is fine for the grass. Kansas State University says that if you follow the one-third rule, you don't need to remove clippings. Small, frequent cuts fit that rule well.
Look for a safety standard
Robot mowers have their own safety standard. ANSI/OPEI 60335-2-107 sets safety requirements for robotic battery-powered lawnmowers and their charging stations. Ask a seller whether the model is tested to it. Keep children and pets off the lawn while the mower runs.
A short checklist
- Measure mowable grass and add 20 to 40 percent capacity.
- Measure your steepest slope and your tightest passage.
- Note your tree cover and pick a navigation type.
- Check that Wi-Fi or cellular reaches the dock.
- Budget for blades, service and storage.
Then compare models in the comparison table.
