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Robot mowers for a quarter acre lawn: which fit and why

Botsize ran every robot mower in its dataset through the sizer for a quarter acre lawn of typical shape. The verdicts below follow your region, and each card shows the numbers behind its verdict.

Updated

Results for buyers in the US

The lawn behind this page

Your lawn
0.25 acres1,010 m²
Shape
typical, × 1.35
Mowing hours
any time, × 1.0
Rating it needs
0.34 acres1,370 m²
Steepest slope
15% (8.5°)a clear pass needs a rating of 20% or more

Change these numbers in the sizer, or read how the shape and hours factors work in the methodology. They are rules of thumb.

Of the 33 mowers sold in the US: 25 fit, 3 are tight and 5 do not fit.

Closest fitMAMMOTION LUBA mini 2 AWD 1500Limit 0.37 acres
Lowest price that fits$1,499Roborock RockMow X115H, as of October 2026

Closest fit first: the smallest limit that still covers the rating your lawn needs, then the lower price, then the larger slope margin.

Botsize may earn a commission when you buy through links on this page. It never changes the math or the ranking.

Fits25

The limit covers the rating your lawn needs, and nothing rules the model out.

Segway Navimow

i215 LiDAR

Fits

No wire, LiDAR and camera

AreaFitsRecommended for 0.37 acres; the sizer allows 1.2 times that: 0.44 acresYour 0.25 acres is 56% of the 0.44 acres the sizer allows. Needs 0.34 acres with the margin: 0.11 acres to spare.
SlopeClearRated for 45% (24.2°), 30 points above your 15% (8.5°).
$1,599 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the i215 LiDAR (opens in a new tab)
Fits

No wire, satellite positioning

AreaFitsRecommended for 0.37 acres; the sizer allows 1.2 times that: 0.44 acresYour 0.25 acres is 56% of the 0.44 acres the sizer allows. Needs 0.34 acres with the margin: 0.11 acres to spare.
SlopeClearRated for 80% (38.7°), 65 points above your 15% (8.5°).

Needs antenna: not stated and open sky over the lawn.

$1,499 price on the maker's page as of October 2026Specs and sourcesRoborock page for the RockMow X115H (opens in a new tab)

ANTHBOT

N8

Fits

No wire, no antenna at home

AreaFitsRecommended for 0.37 acres; the sizer allows 1.2 times that: 0.44 acresYour 0.25 acres is 56% of the 0.44 acres the sizer allows. Needs 0.34 acres with the margin: 0.11 acres to spare.
SlopeClearRated for 45% (24.2°), 30 points above your 15% (8.5°).

Needs no antenna at home and open sky over the lawn.

$1,699 price on the maker's page as of October 2026Specs and sourcesANTHBOT page for the N8 (opens in a new tab)

Tight3

The limit covers your lawn but not the margin, or the slope is at its limit.

Segway Navimow

i210 AWD

Tight

No wire, no antenna at home

AreaTightRecommended for 0.25 acres; the sizer allows 1.2 times that: 0.3 acresYour 0.25 acres is 83% of the 0.3 acres the sizer allows. Covers your lawn but not the margin: 0.04 acres short of the 0.34 acres it needs.
SlopeClearRated for 45% (24.2°), 30 points above your 15% (8.5°).

Needs no antenna at home and open sky over the lawn.

$1,299 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the i210 AWD (opens in a new tab)

ANTHBOT

M9

Tight

No wire, no antenna at home

AreaTightRecommended for 0.25 acres; the sizer allows 1.2 times that: 0.3 acresYour 0.25 acres is 84% of the 0.3 acres the sizer allows. Covers your lawn but not the margin: 0.04 acres short of the 0.34 acres it needs.
SlopeClearRated for 45% (24.2°), 30 points above your 15% (8.5°).

Needs no antenna at home and open sky over the lawn.

$899 list price as of October 2026Specs and sourcesANTHBOT page for the M9 (opens in a new tab)
Tight

No wire, needs an antenna at home

AreaTightRated for up to 0.25 acresYour 0.25 acres is 100% of its 0.25 acres rating. Covers your lawn but not the margin: 0.09 acres short of the 0.34 acres it needs.
SlopeClearRated for 45% (24.2°), 30 points above your 15% (8.5°).

Needs an antenna at home and open sky over the lawn.

$999.99 price on the maker's page as of October 2026Specs and sourcesECOVACS page for the GOAT O1000 RTK (opens in a new tab)

Does not fit5

Each line gives the reason in numbers.

This page ranks the 33 mowers in the Botsize dataset that are sold in the US. Prices are the maker's list price, or the price its page showed that month (sometimes a sale price), with the month we read it.

To work out your own lawn size, the lawn area calculator adds up the shapes of your garden.

Sizing for a quarter acre

A quarter acre is 10,890 sq ft (1,012 m²). A mower rated for exactly that covers the lawn but not the margin for its shape, so the sizer calls it tight. For this lawn that means 13,068 sq ft (1,214 m²) on one open shape, 14,702 sq ft (1,366 m²) with some beds and trees, and 16,335 sq ft (1,518 m²) for a complex layout. A mower allowed to run in daytime only needs 1.5 times as much again: 22,052 sq ft (2,049 m²) for a typical shape.

Watch the basis of each rating. A model recommended for a quarter acre gets a limit of 1.2 times its rating in the sizer, about 13,068 sq ft (1,214 m²). That still falls short of the 14,702 sq ft (1,366 m²) a typical quarter acre needs, so it lands in tight. A model rated for up to 3/8 or 1/2 acre has room to spare.

Check that the quarter acre is your lawn and not your lot. Once the house, the drive and the beds come off, a quarter acre lot holds a smaller lawn, and the sizer may then point to a smaller mower. The lawn measuring guide works through a quarter acre lot.

Questions about quarter acre lawns

Is a quarter acre mower enough for a quarter acre lawn?
It covers the lawn but not the margin, so the sizer calls it tight. A typical quarter acre needs a rating of about 14,702 sq ft (1,366 m²).
The lot is a quarter acre. Which number goes in the sizer?
The area of grass only. Take the house and garage footprint, the drive, the patio and the beds off the lot size. The lawn area calculator does the subtraction.
How many square meters is a quarter acre?
1,011.7 m², or 10,890 sq ft.