How to Fix a Drawing That Was Created in the Wrong Size in AutoCAD

Short Answer

Yes — if a drawing was created in the wrong size in AutoCAD, the standard professional fix is to scale the geometry using the SCALE command with a correct reference length. This is the fastest and most common method when the entire drawing is uniformly off. It will not fix objects that were drawn inconsistently at multiple wrong scales.

What You Need to Know Before

Warning: If you scale the whole drawing without checking annotation objects, dimensions, blocks, and xrefs, you can distort plotted output and annotation behavior. A very common failure is scaling model geometry correctly but leaving dimensions or annotative objects visually wrong afterward.

How to Fix It in AutoCAD

• Command: SCALE

• Shortcut: SC

• Quick Steps:

  1. On the Ribbon, go to Home tab > Modify panel > Scale, then select all objects that were created at the wrong size.
  2. Pick a base point, then type R for Reference to scale by a known existing length instead of guessing a factor.
  3. Select the current reference length, then enter the correct target length and press Enter.

Variables & Settings

• Key Setting: Reference option in the SCALE command

• Expert Setting: Using Reference is safer than entering a raw scale factor because it converts the drawing based on an actual known measurement. This reduces errors when the original size is unknown or when converting between units such as mm and inches.

Why it Fails

• Cause 1 (Geometry): Only part of the drawing is selected, so some objects remain at the old size and the file becomes inconsistent.

• Cause 2 (layers/Locks): Objects on locked layers are not modified, which leaves blocks, linework, or underlays unchanged.

• Cause 3 (Command/Logic): Users enter a guessed scale factor instead of using Reference, causing the corrected drawing to still be inaccurate.

Quick Fix & Best Practice

• Quick Fix: Use DIST first to measure a known object, then run SCALE with the Reference option to match that object to its true size.
• Manager’s Verdict: Use this method when the entire model is uniformly wrong in size. Avoid it if only certain objects are wrong or if annotation, dimensions, and external references have not been reviewed first.

FAQ

Can I fix the wrong drawing size without redrawing?

Yes, if the geometry is uniformly off, SCALE usually fixes it.

Should I use SCALE or change units?

Use SCALE to resize geometry; changing units alone does not resize existing objects.

Will dimensions update after scaling?

Not always — dimensions may need to be checked or updated depending on how they were created.

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