How to Plot 1:100 in AutoCAD
For a typical millimetre-based AutoCAD model, the safest Layout workflow for 1:100 is simple: keep the model full size, set the viewport to 1:100, keep the Layout output at 1:1, then verify the PDF at 100%.
Start here — what you are going to do
Your goal: Create and verify a Layout viewport at exactly 1:100.
Where to start: Open the DWG and identify the Layout you want to issue.
Beginner rule: Change one scale-related setting at a time. After setting a viewport or plot scale, use Preview and verify one known measurement before trusting the final sheet.
Step by step — follow this in AutoCAD
Step 1 — Confirm the model is full size
Where: Model Space > measure a known object.
Do this: Make sure the drawing uses the intended real-world dimensions. These beginner steps assume the model is drawn in millimetres.
Check: A known object measures correctly in the model.
Step 2 — Open the real Layout
Where: Bottom tabs > choose the sheet Layout.
Do this: Use the actual title-block sheet and paper size.
Check: The paper sheet is visible.
Step 3 — Select the viewport
Where: Paper Space > click the viewport border.
Do this: Select the viewport object, not geometry inside it.
Check: Viewport Scale is available.
Step 4 — Set the viewport to 1:100
Where: Status bar Viewport Scale or Properties > Standard Scale.
Do this: Choose 1:100. If it is missing, add a verified scale with SCALELISTEDIT.
Check: The viewport reports 1:100.
Step 5 — Frame the model with PAN
Where: Double-click inside viewport > PAN.
Do this: Move the view into place without mouse-wheel zoom.
Check: The viewport still reports 1:100.
Step 6 — Lock the viewport
Where: Select viewport border > Properties > Display Locked = Yes.
Do this: Protect the approved scale.
Check: The view cannot be accidentally rescaled.
Step 7 — Keep the Layout at 1:1
Where: Page Setup > Plot Area = Layout / Plot Scale.
Do this: Use the normal 1:1 sheet output for the prepared Layout.
Check: No second AutoCAD scale is applied.
Step 8 — Verify the PDF
Where: Preview > Plot to PDF > measure at 100%.
Do this: Check a known 5 m model length. At 1:100, it should be 50 mm on paper.
Check: The measured PDF confirms the scale.
Beginner example
You need a drawing at 1:100. A known 5 m model distance should measure 50 mm on the verified PDF. That simple measurement gives you a fast proof that the whole model-to-paper chain is correct.
Understand what AutoCAD is doing
What 1:100 means
At 1:100, one unit on paper represents 100 of the same units in the model. For a millimetre-based model, 5 m becomes 50 mm on paper.
The viewport carries the drawing scale
In the standard Layout method, the Viewport Scale is set to 1:100. The physical Layout is still plotted at 1:1.
Do not copy this blindly to metre-based models
If your office draws with one model unit representing one metre, the numeric custom-scale relationship differs. Use the office standard and verify a known measurement instead of typing a metric factor from a millimetre drawing.
Useful next guides: Plot Scale · Viewport Scale · Set a Viewport Scale · Verify Viewport Scale · How to Print in AutoCAD
Common problems and what to check first
| What you see | What may be causing it | Check this first |
|---|---|---|
| 1:100 is missing from list | Scale list does not contain it | Use SCALELISTEDIT and verify the paper/drawing ratio. |
| Viewport becomes custom | Mouse-wheel zoom changed magnification | Reapply 1:100, use PAN, then lock. |
| PDF is the wrong size | Page Setup uses wrong paper | Correct paper and keep Layout output at 1:1. |
| Paper measurement is wrong | PDF viewer/printer rescaled it | Print at Actual Size/100% and remeasure. |
When you need a more repeatable workflow
For recurring metric sheets, save the proven paper settings in a named Page Setup, use the standard scale from the viewport list, lock the viewport, and keep one measured PDF as a reference. If the office works in metres rather than millimetres, document that unit convention beside the scale standard so users do not copy the wrong numeric factor.
Official Autodesk references
Interface labels can vary slightly by AutoCAD release and workspace. These Autodesk pages are the primary references for the workflow above.
Frequently asked questions
Should the Layout itself be plotted at 1:100?
Normally no. In a prepared Paper Space Layout, the Layout is plotted at 1:1 and the viewport is set to 1:100.
What should 5 m measure on paper at 1:100?
It should measure 50 mm, assuming the same unit relationship and no downstream scaling.
What if my model is drawn in metres?
Use your office’s verified custom scale workflow. Do not assume the same numeric viewport factor as a millimetre-based model.
Explore more in CAD Plot Scale: Metric, Architectural & Engineering.