Method
How we verify a spec
Every number on this site is one a manufacturer published, or one derived from a number a manufacturer published. Where we could not confirm a figure, the row says so rather than filling the gap with something plausible.
What counts as a source
A specification is only accepted from the maker: its product pages, spec tables, operator manuals and press material. Retailers — Amazon, Home Depot, Lowe’s, Walmart — count as corroboration, never as the origin of a figure. Review sites and forums are used for one purpose only: to flag that a discrepancy might exist, which then sends us back to the manufacturer. No number on this site originates from a blog.
Regional variants are treated as different machines. A European model number is not evidence about the US machine it resembles, and conflating the two is how the Landroid WR340 came to be listed at 0.37 acres nearly everywhere.
Confidence, published on every row
Verified means the manufacturer plus at least one independent source agree. Single source means only one source publishes it and we have not been able to confirm it — the figure is shown, labelled, and treated as provisional. We would rather say “unconfirmed” than guess about a slope a machine has to climb.
When a manufacturer contradicts itself
It happens more than you would expect, and we do not quietly pick a winner. Husqvarna’s spec table gives the 450XH EPOS 2.5 acres while its own operator manual gives 1.25. Sunseeker’s manual gives the X7 3,000 square metres while its brand page claims up to 3 acres. In each case the row carries the figure most consistent with how we read that maker’s other rows, and the conflict is written into the note so a reader can see the disagreement rather than inherit our judgement of it.
Why slope is stored twice
Every machine carries its maximum slope in both percent grade and degrees. Manufacturers publish the two interchangeably — Segway prints percent first, Husqvarna prints percent only, WORX prints both — and the same number means wildly different things depending on the unit. 45% grade is 24.2°. 45° is 100% grade. They cross at exactly one point.
Degrees on this site are always computed from the percent figure the maker published, as arctan(percent ÷ 100), rounded to one decimal. Manufacturers round inconsistently — Mammotion prints 38.6° for 80% where Dreame prints 38.7° for the same grade — and those roundings had leaked into the table, so two machines at the same pitch showed different angles. Deriving the column ourselves is the only way the comparison holds.
The coverage buffer
Rated area assumes a clean rectangle. Real lawns lose area to borders, no-go zones, flower beds and the travel paths between zones. Every match on this site requires a machine rated for 25% more than the area you actually mow. That single rule moves machines off shortlists more often than any other, and it is the reason a mower rated for “1 acre” is not a mower for your acre.
What we do not do
We have not tested these machines. This is a specification database, not a review site, and it does not tell you whether a mower is reliable in year three or whether its app is any good. It tells you which machines are rated for your land and which are not, from figures traced back to the people who published them. Where reliability is an open question — and for several newer makers it is — the row says nothing rather than inventing an opinion.
Some links earn a commission. No commission has ever changed a rating, and the machines that pay nothing at all — the entire Kress and Husqvarna ranges — are in the database on the same terms as everything else.
Straight answers
- Where do these specifications come from?
- Manufacturer product pages, spec tables, operator manuals and press material. Retailers corroborate but never originate a figure, and no number comes from a blog or review site.
- What does the confidence level on each row mean?
- Verified means the manufacturer plus at least one independent source agree — 32 of 34 rows. Single source means only one source publishes it and it is treated as provisional — 2 rows.
- How is the degrees figure calculated?
- Always from the percent grade the manufacturer published, as arctan(percent ÷ 100), rounded to one decimal. Manufacturers round inconsistently, so deriving it ourselves is the only way machines stay comparable.
- Have these mowers been tested?
- No. This is a specification database, not a review site. It tells you what each machine is rated for and how confident we are in that figure, not how it performs in year three.