How to Choose a Robot Lawn Mower

Pick a robot mower by yard size, steepest slope, tree cover and running costs, then check navigation type and edge handling.

Researched by the robotsforthat team · updated Oct 14, 2026 · How we research

Match the mower to your yard size

Every brand rates its mowers by lawn area, usually in acres. Treat that number as a ceiling, not a target. Husqvarna, for example, rates the Automower 410 iQ for 0.5 acre but only 0.25 acre for irregular layouts.

Look at area per charge too. Small batteries mean many short trips back to the dock. The Navimow i206 mows about an hour per charge, while PCWorld measured about 110 minutes for the Navimow X430. If your lawn sits near the top of a model's rating, step up one size.

Know your steepest slope

Slope ratings are given as a percentage grade. A 45% grade is about 24 degrees. Budget and two wheel drive models are often rated around 30% to 45%, while all wheel drive models such as the Mammotion LUBA 3 AWD, Dreame A3 AWD Pro and Mova LiDAX Ultra claim 80%.

Real results can fall short. Notebookcheck's ramp test got both the Dreame A3 AWD Pro and a Mova LiDAX Ultra to just over 70%, not the claimed 80%. Some mowers also have a lower limit at the edge of the lawn: Husqvarna allows 45% inside the area but only 15% at the boundary. Measure your steepest spot and leave a margin.

Heavy AWD mowers can mark soft turf. Gizmodo saw ruts and bald spots from the Dreame A3 AWD Pro on damp inclines, and TechRadar saw front wheel scuffing from the LUBA 3 AWD in shaded areas.

Navigation: RTK, LiDAR or vision

RTK mowers use satellite positioning corrected by a base station or a network service. Network RTK, used by Navimow, Airseekers and the larger LUBA 3 models, usually avoids installing an antenna, but it needs open sky and phone coverage. PCWorld noted the X430 still needs its included antenna where Network RTK is not available.

LiDAR mowers scan their surroundings with a laser and do not need satellites, which helps under trees and next to tall buildings. Techaeris found the LiDAR based LUBA mini 2 AWD reliable under tree cover and beside fences, and Gizmodo pointed to LiDAR as the reason to choose the Dreame A3 AWD Pro for satellite poor lawns.

Most mowers also carry cameras for obstacle avoidance. Results vary: Gear Diary saw a LUBA 3 AWD miss a hose on the low setting, and BGR found the Ecovacs GOAT treated tall weeds as obstacles. Plan to pick up toys, hoses and dog waste before a run anyway.

Auto mapping is convenient but not always reliable. PCWorld had to map the Mova LiDAX Ultra 3000 by hand after its AI mapping failed on a complex lawn.

Wire versus wire free

Older robot mowers follow a perimeter wire buried or pegged around the lawn. Wire free models replace it with virtual boundaries drawn in an app, so changing a flower bed means redrawing a line, not moving a cable.

Some mowers support both. Husqvarna's 410 iQ runs on virtual boundaries with its EPOS system but can also use a physical wire, which is sold separately. If your yard has poor satellite reception and no LiDAR option fits your budget, a wired mower is still a valid choice.

Zones, narrow passages and edges

If your lawn is split into front and back sections, check how many zones a mower supports and whether it can drive between them on its own. Gear Diary's LUBA 3 AWD crossed a driveway between two lawn areas by itself. Zone limits range widely, from 20 on the LUBA mini 2 AWD to 120 on the Navimow X4 and 150 on the Mova LiDAX Ultra 3000.

Narrow gaps trip up many mowers. Bob Vila found the Airseekers Tron SE needed more help in narrow sections, while the compact LUBA mini 2 AWD moved through tight spaces well.

No robot here cuts perfectly to the edge. Tom's Guide found the Sunseeker S4 leaves a strip because its blades sit 4.3 inches in from the housing. Models with a side trimmer or edge disc, like the Ecovacs GOAT A3000 LiDAR PRO and LUBA mini 2 AWD, reduce but do not remove trimming.

Total cost of ownership

Blades are a running cost. Tom's Guide reports Sunseeker recommends new blades after 120 hours of use. Airseekers sells an 18 blade pack for $29, and Navimow sells i2 cutting disks for $39.99.

Check for data fees. Navimow includes Network RTK at no extra cost but charges $32.90 a year for Connect+ cellular service after the first year on the X430. Mammotion includes 3 years of 4G data, and Worx says its RTK Cloud is free for life.

Warranty length differs: Husqvarna offers 4 years in the US and Canada, while Navimow, Mammotion, Mova and Airseekers list 3 years. Replacement batteries cost roughly $160 to $450 for the Navimow models we checked.

Search the CPSC recall database for your brand before buying. CPSC recalled about 1,400 Husqvarna Automower 435X and 535 AWD units in 2022 for battery overheating.

What to skip

Skip models that are only announced, preorder or crowdfunded unless you accept the risk of delays. Skip any mower whose slope rating is below your steepest spot. Skip RTK only mowers if your lawn is mostly under trees, and skip LiDAR mowers with heavy wheels if your turf is often soft and wet.

Finally, do not buy far more mower than you need. Reviewers called large AWD flagships overkill for small lawns, and a compact model will usually turn more easily in a small yard.