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

Botsize ran every robot mower in its dataset through the sizer for a one 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
1 acre4,050 m²
Shape
typical, × 1.35
Mowing hours
any time, × 1.0
Rating it needs
1.35 acres5,460 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: 5 fit, 6 are tight and 22 do not fit.

Closest fitSegway Navimow X350Limit 1.8 acres
Lowest price that fits$2,799Segway Navimow X350, 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.

Fits5

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

Segway Navimow

X350

Fits

No wire, needs an antenna at home

AreaFitsRecommended for 1.5 acres; the sizer allows 1.2 times that: 1.8 acresYour 1 acre is 56% of the 1.8 acres the sizer allows. Needs 1.35 acres with the margin: 0.45 acres to spare.
SlopeClearRated for 50% (26.6°), 35 points above your 15% (8.5°).

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

$2,799 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the X350 (opens in a new tab)

Segway Navimow

X450

Fits

No wire, no antenna at home

AreaFitsRecommended for 1.5 acres; the sizer allows 1.2 times that: 1.8 acresYour 1 acre is 56% of the 1.8 acres the sizer allows. Needs 1.35 acres with the margin: 0.45 acres to spare.
SlopeClearRated for 84% (40°), 69 points above your 15% (8.5°).

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

$2,999 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the X450 (opens in a new tab)
Fits

No wire, satellite positioning

AreaFitsRated for up to 6.18 acresYour 1 acre is 16% of its 6.18 acres rating. Needs 1.35 acres with the margin: 4.83 acres to spare.
SlopeClearRated for 70% (35°), 55 points above your 15% (8.5°).
  • Oversized: its limit is more than 6 times your lawn.

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

$5,999 list price as of October 2026Specs and sourcesYarbo page for the Y40 Core with Lawn Mower Pro Module (opens in a new tab)
Fits

No wire, no antenna at home

AreaFitsRated for up to 6.99 acresYour 1 acre is 14% of its 6.99 acres rating. Needs 1.35 acres with the margin: 5.64 acres to spare.
SlopeClearRated for 70% (35°), 55 points above your 15% (8.5°).
  • Oversized: its limit is more than 6 times your lawn.

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

$7,599 list price as of October 2026Specs and sourcesYarbo page for the Y40P Core with Lawn Mower Pro Module (opens in a new tab)

Tight6

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

Segway Navimow

X330

Tight

No wire, needs an antenna at home

AreaTightRecommended for 1 acre; the sizer allows 1.2 times that: 1.2 acresYour 1 acre is 83% of the 1.2 acres the sizer allows. Covers your lawn but not the margin: 0.15 acres short of the 1.35 acres it needs.
SlopeClearRated for 50% (26.6°), 35 points above your 15% (8.5°).

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

$2,299 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the X330 (opens in a new tab)

Segway Navimow

X430

Tight

No wire, no antenna at home

AreaTightRecommended for 1 acre; the sizer allows 1.2 times that: 1.2 acresYour 1 acre is 83% of the 1.2 acres the sizer allows. Covers your lawn but not the margin: 0.15 acres short of the 1.35 acres it needs.
SlopeClearRated for 84% (40°), 69 points above your 15% (8.5°).

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

$2,499 price on the maker's page as of October 2026Specs and sourcesSegway Navimow page for the X430 (opens in a new tab)
Tight

No wire, satellite positioning

AreaTightRecommended for 1 acre; the sizer allows 1.2 times that: 1.2 acresYour 1 acre is 83% of the 1.2 acres the sizer allows. Covers your lawn but not the margin: 0.15 acres short of the 1.35 acres it needs.
SlopeClearRated for 80% (38.7°), 65 points above your 15% (8.5°).

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

$2,499 price on the maker's page as of October 2026Specs and sourcesRoborock page for the RockMow X130H (opens in a new tab)

Does not fit22

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 an acre

An acre is 43,560 sq ft (4,047 m²). For this lawn that means 52,272 sq ft (4,856 m²) on one open shape, 58,806 sq ft (5,463 m²) with some beds and trees, and 65,340 sq ft (6,070 m²) for a complex layout. A mower allowed to run in daytime only needs 1.5 times as much again: 88,209 sq ft (8,195 m²) for a typical shape.

Check the basis of the largest ratings before you compare them. Most makers state a maximum, some a recommended size, and a few list the area cut per day or per week. A figure for weekly coverage at two mowings a week is not the same promise as a maximum lawn size, so read the rating on each model page, where the basis is stated.

On a lot this size, separate lawns, long side strips and slopes all count. Enter the number of separate lawns and the steepest slope in the sizer, and use the open, typical or complex shape that describes the whole acre, not its largest part.

Questions about one acre lawns

What rating does a one acre lawn need?
About 58,806 sq ft (5,463 m²) for a typical shape mowed at any time, and 52,272 sq ft (4,856 m²) for one open shape.
How many square meters is an acre?
4,046.86 m², or 43,560 sq ft.
A model lists several acres. Is it rated for an acre lawn?
Read the basis on its model page. A figure for weekly coverage or for the area cut per day describes how much it mows over time, not the largest lawn it can map.