Measure your staircase
Real inches out of one photograph, in the browser. No upload,
no GPU, and no reconstruction: you give it one size it can trust, and it gives you every
other size in that plane.
No site tools in this browser. The measuring works, but the agent cannot help.
Use ChatGPT's desktop browser, or Chrome or Edge with
chrome://flags/#enable-webmcp-testing enabled.
How this works
Load a photo of the surface you want to measure.
Click the four corners of something flat, rectangular and lying on
that same surface , clockwise from the near left. A stair tread (the flat part
you step on), a floor tile, a sheet of paper.
Type its real size below. This is the only thing telling the page what scale
the photograph is at, so a guess here is a guess in every number after it.
Now click any two points on that same surface and get real inches.
The reference
The real size of the rectangle you
just clicked, in inches. It starts at a 41 and a half inch stair tread because that is
this house's; change it to whatever you actually clicked.
Waiting for four corners.
Misclicked? Ctrl+Z, or the Undo
button, takes back one point at a time.
Undo
Redo the corners
What did you film?
The plane is set, so every pixel on that surface is inches now. What comes next depends
on what you are measuring, and they are two different things.
A staircase. Measure its spans.
A room. Trace its floor.
Trace the room
Clicking round where the walls meet the floor turns
those clicks into real inches. You can carry on across several frames of the same video:
pick another frame, click the same four reference corners on it, and the outline keeps
going. Corners from earlier frames show hollow.
Start tracing the floor
Corner behind something
Close the outline
Square it up
Clear the outline
ceiling height, inches
Find these same four corners
This is the frame you already pinned. The
stitch only works if every frame is pinned to the same physical rectangle ,
because that one rectangle is what puts them all in the same inches. A different
rectangle in a different part of the room is a different floor, and the two cancel out.
Stitch the floor from your frames
Stitch the floor
These are candidate stills , not a reconstruction. Nothing is being
stitched: pick the clearest one, click four corners of something whose real size you know,
and that one known size is what turns pixels into inches.
Assign to your staircase
Clear width of the run
Turn, first span
Turn, second span
Headroom over the turn
Rise of one step
Going, the tread depth
Its longest side
Its depth
Its height
Save this reading
Forget these readings
Count the steps
These are counted, not measured, and they decide the
shape of the staircase you will orbit.
Use this staircase in Elbow Room
Saved in this browser only. Nothing is sent anywhere.
Your staircases
Nothing saved yet. Measure one and
name it, and it will be here next time.
Save this one
Ask your agent
“Set the reference to a 41 and a half inch tread.”
Start again