How to set 1:400 scale in AutoCAD?

To set a 1:400 scale in AutoCAD, you usually set it in a Layout (paper space) viewport, not in model space.

How to set 1:400 scale in AutoCAD?

Method 1: Set viewport scale (recommended for printing)

1. Go to a Layout tab (Paper Space).
2. Create or select your viewport (MV command).
3. Double-click inside the viewport to activate it.
4. Type:Z press Enter, then type:1/400XP press Enter.Your viewport is now set to 1:400 scale.
5. Lock the viewport:
   • Select the viewport border.
   • In Properties → Display Locked → Yes.

Method 2: Using the Properties palette

1. Select the viewport border.
2. Open Properties (Ctrl + 1).
3. Find Standard Scale.
4. Choose Custom or type/set 1:400 (depending on your AutoCAD version).

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If you are working in Model Space

AutoCAD generally draws at 1:1 scale in Model Space. You do not scale the drawing to 1:400; instead, you control the scale when plotting through a viewport.

Example:
If your model is drawn in meters:

• 1 unit in Model Space = 1 meter
• A 1:400 viewport means 1 unit on paper represents 400 units in the drawing.

For architectural site plans, 1:400 is commonly used for large layouts and master plans.

Also Read : How to resize or rescale an AutoCAD drawing

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