Most robot vacuums cap out at 0.6 inches.

About 0.6 inches (15mm) is the standard maximum threshold height for most robot vacuums. Some premium models with larger wheels or suspension can handle up to 0.8–1 inch (20–25mm), but that’s the exception.

Why 0.6? Physics and design limits. The vacuum needs to climb without getting stuck or tipping over. Higher thresholds require bigger wheels, more torque, and smarter sensors — which costs more. Even then, carpet thresholds are easier to climb than hard ones because the brushroll can grab.

Don’t trust marketing claims blindly. Look up actual reviews for a specific model. A robot that “handles 1 inch” might only do it on a perfectly angled ramp, not a sharp door threshold.

Measure your own thresholds before buying. A cheap tape measure saves you from buying a robot that can’t leave the living room.