Which robot mower for a half acre?
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A half acre of grass is 21,780 sq ft. If your half acre is open, you'd want a rating of at least 0.5 acres. If you've got heavy trees or two zones, you'd want a rating of at least 0.625 acres. how we size. The LiDAX Ultra 2000 covers the open lawn and misses the tree or two-zone one. The LUBA 3 AWD 3000 and the LiDAX Ultra 3000 AWD cover both.
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A half acre on an 80% slope, with LiDAR and AWD
See LiDAX Ultra 3000 AWD on Amazon
Rated area against a half acre
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| Model | Rated | Open half acre | Half acre with trees or two zones | Slope |
|---|---|---|---|---|
| Navimow i210 AWD | 0.25 acres (10,890 sq ft) | No | No | 45% (24°) |
| LiDAX Ultra 2000 | 0.5 acres (21,780 sq ft) | Yes | No | 45% (degrees not published) |
| Dreame A3 AWD Pro 2500 | 0.62 acres (27,007 sq ft) | Yes | No | 80% (38.7°) |
| LUBA 3 AWD 3000 | 0.75 acres (32,670 sq ft) | Yes | Yes | 80% (38.6°) |
| LiDAX Ultra 3000 AWD | 0.75 acres (32,670 sq ft) | Yes | Yes | 80% (38.6°) |
Makers usually publish one maximum slope and don't say whether it applies in the middle of your lawn or at the edge. When a model also gives a lower figure for the edge, that's the one to use there. If your bank runs into a bed or a fence, we'd leave some margin, because edges are usually harder.
What a half-acre rating leaves out
The Ultra 2000 is rated 0.5 acres and 45% (degrees not published). It matches an open half acre and stops short of 0.625 acres. The i210 is rated 0.25 acres. It's the quarter-acre mower, not a half-acre one. If your lot is half an acre and the grass is only the back yard, measure the grass and use the small-yard page.
MOVA LiDAX Ultra 2000, MOVA US; amazon.com listing, checked Oct 13, 2026.
The Dreame 2500 is rated 0.62 acres and 80%. That area is just under 0.625 acres, so a complex half acre isn't covered. It's still the LiDAR comparison when your bank is steeper than the Ultra 2000's 45%.
Dreame A3 AWD Pro, Dreame Yard Care US, checked Oct 10, 2026.
The LUBA 3 AWD 3000 is rated 0.75 acres and adds network RTK beside LiDAR. The Ultra 3000 AWD is rated 0.75 acres and 80%. Few owner reports exist yet for the MOVA family, so we'd treat that as a real gap. The MOVA review says that plainly.
LUBA 3 AWD, Mammotion US; MOVA LiDAX Ultra 3000 AWD, MOVA US, checked Oct 10, 2026.