Robot Mower Lawn-Size Calculator

Measure Your Lawn

Break the lawn into simple shapes: rectangles, circles and triangles. Add each one, then add any flower beds, ponds or patios inside the lawn as "subtract" shapes. A tape measure or a measuring app on your phone is enough.

Robot Mowers Rated for Your Lawn

Models from our database whose manufacturer-stated maximum area covers your lawn. Optionally add your steepest slope to narrow the list.

Ratings are the manufacturer's stated maximums, from the brand's UK page or the UK retailer we used, checked 28 October 2026. A lawn with many trees, beds or narrow passages takes longer to mow than an open one of the same size, so if your lawn is close to a model's limit, read the manufacturer's notes. Models with no published area rating are not listed.

Tips for Measuring

• Measure the grass, not the garden. Paths, patios, decking and beds do not count.
• Separate lawns count together if one mower will cover both, for example front and back. Our multi-zone guide covers mowers that handle more than one area.
• Odd shapes: split a curved edge into a rectangle plus a triangle or half-circle. Being within 10% is close enough to choose a mower.
• No tape measure? Pace it out. Measure your own stride once against a known length, then count steps.

What Size Do Most UK Lawns Fall Into?

Market analysts Mordor Intelligence estimate that mowers for lawns under 500 m² took 51.1% of the UK market in 2025. If your result is under 500 m², start with the best robot mowers for small gardens. Over 1,000 m², see large lawns.