- Rated to climb a rise of 80 ft80 m for every 100 ft100 m forward
- A laser scanner lets it keep mowing under trees
- Wide 15.7 in40 cm cut, so a big lawn takes fewer passes
- Costs more than most robot mowers
- Rated at up to 70 decibels, the loudest mower we cover
- The version we link to will not cut your grass shorter than 2.2 in55 mm
The brand's numbers
- How it knows where to go
- A laser, satellites and two cameras. No wire to lay.
- Biggest lawn it can keep cut
- 0.74 acres3,000 m²
- Steepest hill it can climb
- 80% — a rise of 80 ft per 100 ft (about 39°)
- Cutting width
- 40 cm (15.7 in)
- Cut height
- 55–100 mm (2.2–3.9 in)
- Can remember more than one lawn
- Yes
- How it gets around things in its way
- A laser that measures what is around it, two cameras, a bumper it nudges things with
- No boundary wire to lay
- Yes
- Needs open sky over the lawn
- No
- Connectivity
- bluetooth, wifi, 4g
- Loudness
- 70 decibels
- Price checked on
- September 2026
The rated lawn area is how much grass the brand says this mower can keep cut. It mows, returns to its charging base to recharge, then goes back out to mow again. A lawn bigger than the rated area will not damage the mower. It cannot reach every part of the lawn often enough, so grass at the far end grows too tall between cuts. Brands rate each mower for the steepest ground it can handle. Do not go past that rating. On ground steeper than that, the mower can slip.
Use our Yard Finder to find the best robot mowers for your exact yard Trace your lawn. We read its size, slope and tree cover off the map, then show you the mowers that clear those numbers.Which yard is the LUBA 3 for?
The LUBA 3 suits the yards that give cheaper robot mowers trouble. That means a steep lawn, a shady one, or a big one. Mammotion rates it for a lawn up to 0.74 acre3,000 m². It climbs ground steep enough that mowing it by hand is a chore. And it keeps cutting under trees. Mowers that steer by satellite stop there and wait for a signal.
If your lawn is small, flat and open, this is more mower than you need. A cheaper mower would cut that lawn just as well. It is also the wrong mower if you like your grass cut short. The version we link to cannot go below 2.2 in55 mm. For a small shady yard, our eufy E15 review covers an easier option.
How steep a slope will it climb?
- 80ft80m
- The steepest rise Mammotion says it climbs, per 100 ft forwardThe steepest rise Mammotion says it climbs, per 100 m forward
- 68ft68m
- What we would plan for on wet grass, per 100 ft forwardWhat we would plan for on wet grass, per 100 m forward
- 15.7in40cm
- The width it cuts on each pass
Mammotion says the LUBA 3 climbs a slope that rises 80 ft80 m for every 100 ft100 m forward. That is an angle of about 39 degrees. It is very steep: steeper than most people would want to walk down carrying a full basket. Few yards are that steep, so on most hills you will never reach the limit.
It climbs this well for a simple reason. It drives all four wheels. Most robot mowers drive only two. On a slope, four driven wheels grip where two would spin and slide back.
Two things still mean you should plan for less than that. The first is wet grass. Slope ratings come from dry grass, and wet grass is slippery, so take about 15% off the slope figure. Plan for a rise of about 68 ft68 m per 100 ft100 m after rain or early in the morning. The second is the edge of the lawn. Driving straight up a hill is easier than turning on it. The mower has to turn when it reaches the top edge. That is where it is most likely to slip.
Want a robot mainly for a steep hill? Compare it with the others in our best mowers for hills.
Does it keep working under trees?
A robot mower has to know where it is to stay on your lawn. The LUBA 3 works that out in three ways at once. Together they are why trees bother it less than they bother most mowers.
The first way is satellites. They are the same ones a phone uses. A plain satellite position is off by several feet. The federal program that runs GPS puts a phone’s position at about 16 ft4.9 m off under open sky. It says that gets worse near trees. That is far too rough to mow to the edge of a flower bed. So the mower corrects it. A fixed point on the ground reads the same satellites. It knows its own exact spot, so it works out how far off the satellites are right now. With that, the mower knows where it is to an inch or two.
The LUBA 3 can get that correction two ways. The antenna and its base come in the box either way. If Mammotion’s service reaches your address, the correction comes over Wi-Fi or a cell signal. Then the antenna stays in the box. If it does not reach you, you fix the antenna on a pole where it has clear sky.
Either way, trees or a wall can block the sky over parts of the lawn. That is where the third tool matters. A laser scanner on top sweeps the ground around the mower and reads its shape. Cameras watch the grass as well. Together they let the mower track its position under branches. A mower using satellites alone would lose its position there and stop. Mammotion calls the three together Tri-Fusion.
What it costs to run
There are costs beyond the price. The mower has its own cell connection. Mammotion includes three years of that service, and after that you renew it. Budget for spare blades too, as you would with any robot mower.
Noise and cut height matter most day to day. Mammotion rates the LUBA 3 at up to 70 decibels, the loudest mower we cover. A 10-decibel step sounds about twice as loud. So if it runs in the evening by a bedroom window, you will hear it. At the far end of a big yard in the afternoon, the noise will not bother you.
It cuts a wide 15.7 in40 cm strip, one of the widest of the mowers we cover. A wider strip means fewer passes, so it finishes a big lawn sooner. But the version we link to is the High version. It will not cut shorter than 2.2 in55 mm. Mammotion also makes a Standard version. It cuts down to 1.0 in25 mm. Check which one you are buying.
It senses rain and waits in its dock until the rain stops. And it can hold more than one lawn on the same map, which helps if your grass sits in two areas.
Is it worth it?
For a steep or shady yard up to about 0.74 acre3,000 m², the LUBA 3 is worth the money. It climbs slopes a cheaper mower cannot. And it keeps cutting under trees, where those mowers would stop. You pay a lot for that, and most flat, open yards do not need it.
So measure your yard before you spend. Walk the steepest part and picture mowing it by hand. If that feels risky, this is one of the few robots rated to climb it. Check whether the correction service reaches your address, so you know whether you are mounting an antenna. And if you want your grass cut shorter than 2.2 in55 mm, buy the Standard version or look elsewhere. Our comparison of the A2500 and the LUBA 3 puts the two next to each other on shade and slope.