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Most robot vacuums clear a threshold of about 20mm. Where makers publish a figure it ranges from 20mm to a claimed 80mm, and the highest claims carry conditions that change what they mean. Measure your tallest door sill before you shop — in an older house it will rule out most of the market.
This is the page this site was built to write. Manufacturers publish threshold climb heights inconsistently, in different units, with different conditions attached, and several do not publish them at all — while still selling chassis-lift hardware whose only purpose is climbing. Nobody puts them in one table.
So here is the table, with the condition each maker states and a link to the page each figure came from. We have not measured any of these. What we have done is read every manufacturer page we could reach and record what it says.
Published maximum threshold climb height, every model we cover
11 of 29 models publish this figure. Every number below links to the page it came from.
60mm over a series of steps, 42mm over a single step
Dreame's own condition, quoted: "The gap between steps should be greater than 4cm. For a single obstacle crossing and a single vertical step, the highest obstacle crossing height is 4.2cm." The 6cm headline therefore does not describe a single door sill.Source: Dreame X50 Ultra product page — ProLeap step climbing (retrieved 2026-09-01)
Not stated on eufy's E28 page. A figure of 0.83in appears in a bundle comparison table elsewhere on eufy's site; because it is not on the product page for this variant we do not publish it.
Compiled from the manufacturers’ own published material — every row carries the date its figure was read. We have not measured any of these figures ourselves, see how we pick. Found an error? Tell us and we will correct it.
Reading the conditions, which is the whole point
Dreame X50 Ultra: 60mm is not a door sill
Dreame advertises climbing obstacles up to 6cm, and in the same specification states: "The gap between steps should be greater than 4cm. For a single obstacle crossing and a single vertical step, the highest obstacle crossing height is 4.2cm." A door sill is a single vertical step. So for the purpose most buyers care about, the figure is 42mm, not 60mm — and Dreame says so in its own material, which is more than several rivals do.
Roborock Qrevo CurvX: 40mm, double-layer, with the chassis lift engaged
Roborock states the CurvX can cross double-layer thresholds up to 1.57in (40mm) with its chassis lift engaged. A double-layer threshold is a stepped sill — two smaller rises rather than one vertical face — which the chassis can take in two bites. Roborock publishes no separate figure for a single vertical sill on the CurvX. Its predecessor, the now-discontinued Qrevo Curv, did: 30mm standard against 40mm double-layer. That is the best available clue to how far apart the two cases sit, but it is a figure for a different machine — so if your sill is a single 40mm face, treat the CurvX as unconfirmed rather than assuming it clears.
ECOVACS X9 PRO OMNI: 20mm, with the mop on
ECOVACS states 20mm with the mop attached. That is a lower figure than several rivals and a more useful one, because a mop combo carrying a wet roller behaves differently from a bare chassis and almost nobody else says which state they measured.
eufy X10 Pro Omni: 21mm, published plainly
eufy publishes 0.83in as an obstacle clearance height on its own product page, with no marketing wrapper. It is not a high figure. It is a stated one, which puts eufy ahead of two brands that publish nothing at all.
iRobot and Shark: no figure
Neither iRobot nor Shark publishes a threshold or obstacle climbing height for any model we cover. Shark markets "NeverStuck" technology on the PowerDetect, aimed squarely at this exact problem, without stating a height behind it. We have recorded those as not published rather than filling them in from a review site, because a number we cannot source is worth less than an honest blank.
How to measure your own thresholds
Measure the vertical face, floor surface to the top of the sill, not the total width of the strip. It is the rise that stops the robot.
Measure from the low side. A sill between a tiled kitchen and a carpeted hallway is a different height in each direction, and the robot has to manage both.
Note whether it is one face or two. A stepped sill is genuinely easier and is what the double-layer figures describe.
Find the tallest one in the house. That single measurement decides your shortlist far more than any suction figure.
Add a few millimeters of margin. A published maximum is a laboratory maximum.
If your sills are too tall for everything
Two honest options, and neither is a robot. A threshold ramp — a small wedge glued or taped against the sill — converts a vertical face into a slope and works reliably. Or accept a per-floor arrangement: the robot cleans the rooms it can reach and a different machine does the rest. Both are better than a robot that reports itself trapped in the same doorway every afternoon. If you are choosing between the two brands that dominate the filled rows above, Dreame vs Roborock counts who publishes a climb figure and who does not.
Quick picks
Ranked on the published specifications below. Tap a row to jump to the full write-up.
#
Product
Best for
Max climb
Price
1
Dreame X50 UltraThe only model here that legs itself over a step rather than driving at it, and the only one that publishes the condition attached to its own headline number.
The tallest published climb figure
60mm over a series of steps, 42mm over a single step
Roborock Qrevo CurvXThe highest published suction figure here paired with the highest published mop lift, which is the combination a mixed-floor home actually needs.
Dreame L40s UltraStates 40mm of obstacle clearing and a fully detangling brush, which covers the two problems that actually send robots back to the shop.
eufy X10 Pro Omnieufy publishes an obstacle clearance, a mop lift, two runtimes and both tank capacities — more of its own numbers than any other maker here.
Every figure in this table is linked to the page it came from in the write-ups below. We have not tested any of these machines.
Top pick
Dreame X50 Ultra
The tallest published climb figure
The only model here that legs itself over a step rather than driving at it, and the only one that publishes the condition attached to its own headline number.
60mm over a series of steps, 42mm over a single stepDreame's own condition, quoted: "The gap between steps should be greater than 4cm. For a single obstacle crossing and a single vertical step, the highest obstacle crossing height is 4.2cm." The 6cm headline therefore does not describe a single door sill.Source: Dreame X50 Ultra product page — ProLeap step climbing (retrieved 2026-09-01)
Publishes the caveat as well as the headline, which is rarer than it should be
20,000 Pa stated peak suction and a 395ml on-board bin
Stated 220 minutes of runtime in quiet mode
What it does not
The legs add height and mechanical complexity to a machine that lives under furniture
10.5mm mop raise is modest next to the 17mm figures from Roborock
Who it is for
Split-level rooms, a sunken living room, or a doorway sill that has beaten every robot you have owned.
Skip it if
You read the 6cm headline and stopped there. Dreame's own footnote puts a single vertical step at 42mm, and 6cm only applies to a series of steps with more than 4cm between them.
One last note on this table. If you find a manufacturer page that publishes a figure we have marked as not published, tell us and we will add it with the source and the date.{' '}Contact. Corrections get dated rather than silently edited.
Questions people actually ask
+ Can robot vacuums go over thresholds?
Most clear about 20mm. Where makers publish a figure the range is 20mm to a claimed 80mm, and the highest claims come with conditions. Measure the vertical rise of your tallest sill before you shop.
+ What is the maximum threshold height for a robot vacuum?
Dreame states 42mm for a single vertical step on the X50 Ultra and 60mm for a series of steps with gaps over 40mm. Roborock states 40mm for a double-layer threshold on the Qrevo CurvX. Those are the highest published figures we found.
+ Can a Roomba go over thresholds?
iRobot does not publish a threshold or obstacle climbing height for any Roomba model we cover, so we cannot tell you and will not guess. If sill height is your deciding factor, buy from a maker that states one.
+ Why does my robot get stuck on a threshold it used to cross?
Usually a mechanical change rather than a software one: hair packed into the front caster so it drags instead of rolling, worn wheel treads, or a lower battery giving less motor torque. Clean the caster first.
+ Do threshold ramps work?
Yes, and they are the cheapest fix by a wide margin. A small wedge against the sill turns a vertical face into a slope. The only caveat is making sure it is fixed down, because a ramp the robot pushes around is worse than no ramp.
