Yard Bot Lab
Robot mowers buying guide

Robot mower cutting height and width: how to read both specs

Cutting width and cutting height are the two specs on a robot mower datasheet that describe the cut itself, and both are easier to misread than they look. Width does not scale into coverage time the way buyers expect, and a height range either brackets what your grass species needs or it does not. We have not hardware-tested any of these machines, so every mower figure below is the manufacturer's published claim, quoted with the basis its own datasheet states.

Figures in this guide come from the manufacturer datasheets behind our model pages, verified 2026-07-30.

What a published cutting width describes

Across the mowers we publish pages for, published cutting width runs from 7.1 in to 15.7 in, and the spread is not subtle. Segway publishes 7.1 in for the Navimow i110N, Mammotion 7.5 in for the YUKA mini 2 1000H, Worx 7.9 in for the Landroid Vision WR208, Ecovacs 8.66 in for the GOAT O1000 RTK, Segway 9.3 in for the Navimow X350 and Husqvarna 9.4 in for the Automower 420 iQ. At the top, Sunseeker publishes 14 in for the X7 and both Mammotion and Dreame publish 15.7 in, for the LUBA 3 AWD 3000 and the A3 AWD Pro 3500 respectively.

The trap is that a single number can describe more than one deck geometry. Sunseeker's 14 in figure for the X7 is the combined width of dual cutting discs, three blades on each of two discs, not the width of one disc. Dreame publishes a mowing width of 40 cm (15.7 in) for the A3 AWD Pro and its marketing copy rounds the same deck to 15.8 in dual blades. Below those, Husqvarna's 9.4 in deck uses three pivoting razor blades, Segway's 9.3 in deck on the X350 uses a six-blade cutting disk, and Mammotion's 7.5 in YUKA mini 2 uses one disc with five pivoting razor blades. A dual-disc 14 in machine and a single-disc 9.4 in machine are not two points on the same scale.

Provenance varies too. Most of these figures originate in millimeters and are converted to inches by the maker: 400 mm becomes 15.7 in on the Mammotion and Dreame sheets. Worx does not put cutting width on its web spec table at all; the 7.9 in figure (200 mm) is published in the official Landroid Vision owner's manual and labeled a cutting diameter, on a self-leveling blade disc with cut-to-edge operation. Read the deck description next to the number, not the number alone.

Width, speed, and how long a mow actually takes

Coverage per hour is not width alone. It is width multiplied by ground speed and by how much of each pass the mower repeats, and the published figures show that clearly. Mammotion publishes a mowing rate of 5,400 sq ft per hour for the LUBA 3 AWD 3000, with 0.35 acre per charge. Ecovacs publishes roughly 1,507 sq ft per hour in Delicate mode and 1,938 sq ft per hour in Efficient mode for the GOAT O1000 RTK, flagged as Ecovacs laboratory figures. Segway publishes a mowing capacity of 80 to 120 square meters (0.02 to 0.03 acre) per hour for the Navimow i110N. Mammotion publishes 2,700 sq ft per charge over 125 minutes for the YUKA mini 2 1000H.

Line the widest deck up against a mid-size one and the rate does not track the width. The LUBA 3 is about 1.8 times as wide as the GOAT O1000 RTK (15.7 in against 8.66 in) but its published rate is about 2.8 times higher (5,400 sq ft per hour against up to 1,938). Ground speed is a large part of the difference: Ecovacs publishes 1.15 ft per second in Delicate mode and 1.64 ft per second in Efficient mode, while Segway publishes a maximum mowing speed of 3.3 ft per second for the Navimow X350 and Sunseeker publishes a maximum cutting speed of 0.45 m per second for the X7. The X350 and the GOAT O1000 RTK are within 0.7 in of each other on width, but Segway publishes no comparable sq ft per hour rate for the X350 at all, only a combined charge-and-coverage claim, so the two cannot be ranked on throughput.

Bases differ enough that a clean ranking is not available. Sunseeker's store FAQ gives cutting efficiency of approximately 0.11 acre per hour for the X7, which is about 4,790 sq ft per hour on our own conversion, against Mammotion's 5,400 sq ft per hour for the LUBA 3, but one is a store FAQ figure we converted and the other is published directly in an official compare table. Dreame publishes no rate per hour at all for the A3 AWD Pro 3500, only daily coverage by power mode (0.62 acre in Standard, 0.87 in Efficient, 1.24 in Rush). Segway's X350 figure is a combined charge-and-coverage claim: 30 minutes of charging gives up to 90 minutes of operation covering up to 5,380 sq ft, described as internal laboratory testing. Husqvarna publishes a typical mow time of 84 minutes for the Automower 420 iQ and a layout-dependent area capacity, but no square feet per hour, and Worx publishes neither a rate nor a runtime per charge for the Landroid Vision WR208. For those two, the cutting width tells you nothing about how long a mow will take.

Height ranges and what your grass needs

The target height is a property of your grass, not of the mower. Illinois Extension suggests a mowing height of 2.5 to 3 in for most lawns and publishes per-species ranges including Kentucky bluegrass at 2 to 3 in, tall fescue at 2.5 to 3.5 in, bermudagrass at 1 to 2 in and zoysiagrass at 1 to 3 in. Texas A&M AgriLife Extension, in its warm-season mowing publication by turfgrass extension specialist Becky Grubbs, gives lawn heights of 2.5 to 4 in for St. Augustinegrass and tall fescue, 2 to 3.5 in for Kentucky bluegrass, 1.5 to 2 in for centipedegrass, 1.5 to 3 in for common bermudagrass and 1 to 2.5 in for hybrid bermudagrass. Both sources state the one-third rule: remove no more than a third of the leaf in a single cut. Those are the recommendations of the extension services cited, not ours, and they are the reference band a mower's published range has to bracket.

Match that against what the mowers publish and three of the models we have pages for cannot cut below 2 in at all. Segway publishes 2 to 4 in for the Navimow X350 and 2 to 3.6 in for the Navimow i110N, and Mammotion publishes 2.0 to 3.5 in for the YUKA mini 2 1000H. On a hybrid bermudagrass lawn kept in the 1 to 2.5 in band Texas A&M gives, those three can only reach the very top of the range. The mowers that go lower are the Sunseeker X7 at 0.8 in, the Husqvarna Automower 420 iQ and the LUBA 3 AWD 3000 at 1 in, the Ecovacs GOAT O1000 RTK and Dreame A3 AWD Pro 3500 at 1.2 in, and the Worx Landroid Vision WR208 at 1.57 in.

The top of the range eliminates a different set. Only three of the charted ranges reach a published 4 in maximum: the Husqvarna 420 iQ (published as approximate, 1 in minimum to 4 in maximum), the Sunseeker X7 and the Navimow X350, with the Dreame A3 AWD Pro close behind at 3.9 in. A St. Augustinegrass or tall fescue lawn held toward the top of the 2.5 to 4 in band Texas A&M gives is served by those. The LUBA 3 AWD 3000 is the sharpest case of why the variant matters more than the model: Mammotion publishes its S Version at 1.0 to 2.7 in, below that whole band, and an H Version at 2.2 to 4.0 in at the same price. Buying the model name rather than the variant is how a buyer ends up with a deck that cannot reach the height the lawn needs.

How the height gets adjusted, and in what steps

Two mowers with the same published range are not the same to live with, because the adjustment mechanism is a separate spec. Husqvarna publishes electric cutting height adjustment on the Automower 420 iQ, Segway publishes automatic blade height adjustment on the Navimow X350, and Sunseeker publishes electronic height adjustment with a floating cutting deck on the X7. At the other end, Ecovacs states plainly on the GOAT O1000 RTK spec table that electric height adjustment is not fitted, so the deck is set by hand, and Segway publishes manual adjustment for the Navimow i110N.

Step size is published even less often than mechanism. Ecovacs is the only maker in our set that publishes an increment, stating the GOAT O1000 RTK range as 3 to 8 cm adjustable in 0.5 cm steps, which is the same range its US table prints as 1.2 to 3.2 in. Worx is the only one that publishes a count of positions, 11 across the 40 to 90 mm range in the Landroid Vision owner's manual. Every other datasheet in the set publishes endpoints only.

That matters when your target height is a specific number rather than a band. A published range of 2 to 4 in does not tell you whether 2.75 in is a setting the deck can hold, and no maker we track publishes a full list of stops. If you know the height you intend to keep, the endpoints are the first filter and the increment, where a maker gives one, is the second.

Where these two specs stop being comparable

Height figures do not all measure from the same place. Dreame states that the 1.2 to 3.9 in range for the A3 AWD Pro 3500 is measured from the blade disc to the ground, per a Dreame Lab testing footnote; no other maker in our set states its reference point. Husqvarna labels its 1 to 4 in figures approximate. Worx publishes 1.57 to 3.54 in (40 to 90 mm) in the owner's manual and rounds the same deck to 1.5 to 3.5 in on the web spec table. Those are small differences individually and they compound when you sort nine models by a tenth of an inch.

Variant dependence is the larger hazard, and it applies to both specs. The two 15.7 in decks among the active models, on the LUBA 3 AWD 3000 and the A3 AWD Pro 3500, sit on machines whose height ranges differ by more than an inch at the top, and the LUBA 3's own S and H versions differ by 1.3 in at the top at identical prices. Dreame's rated capacity also changes by variant while the deck does not. Where slope and coverage do the eliminating on a difficult lawn, our guide on steep and large lawns covers that ground, and the LUBA 3 versus Sunseeker X7 comparison puts a 15.7 in single-figure deck next to a 14 in dual-disc one.

Finally, note what is absent from every sheet in the set. No maker publishes pass overlap or an effective mowing width per pass, so the raw width cannot be turned into coverage arithmetic. None publishes blade tip speed, a cut-quality measure, or a list of grass species the deck is designed for. The datasheet answers whether a deck can reach a height and how wide it cuts; it does not answer how well it cuts your grass. For the framework across the rest of the spec sheet, see how to choose a robot mower, and for the small-lot class specifically, best robot mowers for small yards. The Navimow i110N versus YUKA mini 2 comparison sets two near-identical decks, 7.1 in and 7.5 in, side by side.

Frequently asked questions

How wide do robot mowers cut?
Among the models we publish pages for, published cutting width runs from 7.1 in on the Segway Navimow i110N to 15.7 in on the Mammotion LUBA 3 AWD 3000 and Dreame A3 AWD Pro 3500. Read the deck description with the number: Sunseeker's 14 in figure for the X7 is the combined width of two cutting discs, not one.
Does a wider cutting deck mean a faster mow?
Not proportionally. Mammotion publishes 5,400 sq ft per hour for the 15.7 in LUBA 3 AWD 3000 while Ecovacs publishes up to 1,938 sq ft per hour for the 8.66 in GOAT O1000 RTK, so a width ratio of about 1.8 goes with a published rate ratio of about 2.8. Ground speed and mowing pattern carry much of the difference, and several makers publish no rate at all.
What cutting height should I set on a robot mower?
The target comes from your grass species. Illinois Extension suggests 2.5 to 3 in for most lawns, and Texas A&M AgriLife Extension gives lawn ranges such as 2.5 to 4 in for St. Augustinegrass and tall fescue and 1 to 2.5 in for hybrid bermudagrass. Both cite the one-third rule. Check that the mower's published range brackets your target before anything else.
Which robot mowers can cut below 2 inches?
Among the models we publish pages for: the Sunseeker X7 at 0.8 in, the Husqvarna Automower 420 iQ and Mammotion LUBA 3 AWD 3000 at 1 in, the Ecovacs GOAT O1000 RTK and Dreame A3 AWD Pro 3500 at 1.2 in, and the Worx Landroid Vision WR208 at 1.57 in. The Segway Navimow X350, Navimow i110N and Mammotion YUKA mini 2 1000H all publish a 2 in minimum, so they cannot go lower.