The zoom command in AutoCAD changes where you stand to look, not the drawing itself. It is the most repeated action of the working day — repeated so often that it belongs on the mouse rather than on the keyboard.
Before going into ZOOM, one thing needs settling. Three very different jobs in AutoCAD all get called "zooming in and out", and picking the wrong one damages the drawing rather than merely wasting time. This article separates those three, then goes deep on ZOOM. To learn modelling and documentation end to end, see the AutoCAD for construction course.
Three jobs that all get called zooming
| What you want | The right command | Does the drawing change? |
|---|---|---|
| To see something more clearly | ZOOM | No. Only the viewpoint moves |
| To make geometry actually bigger or smaller | SCALE | Yes. Measure it again and the number differs |
| Dimension figures too small on paper | The DIMSCALE variable | Geometry unchanged; only the annotation size |
The middle row causes most of the trouble. Someone who needs to shrink an object and reaches for ZOOM watches it get smaller on screen, then measures it and finds the original number — because ZOOM never touches geometry.
The last row is the same trap in reverse: geometry at the right size but dimension text printing tiny. That belongs to DIMSCALE, an overall factor applied to the text height and arrow size of a dimension style. Autodesk explains it on the About Setting the Scale for Dimensions page.
The rest of this article is about ZOOM.
Use the mouse first, the command second
View control belongs on the mouse. Learn these four lines and most of the work is covered.
| Action | Result |
|---|---|
| Roll the wheel | Zooms around the cursor. Move the cursor to what you want first, then roll, and you never have to pan back |
| Hold the wheel and drag | Pans the view. This is the PAN command; the mouse is quicker than typing its name |
| Double-click the wheel | Fits the whole drawing to the screen — the same as Zoom Extents |
Type Z then E | Zoom Extents again. Two characters worth memorising, for whenever you lose the drawing |
Wheel-dragging works because MBUTTONPAN is set to 1. How much one notch of the wheel magnifies is set by ZOOMFACTOR, which defaults to 60. If the wheel feels too jumpy, drop it to around 20 to 30 and the motion becomes far smoother. The detail is on the ZOOMFACTOR (System Variable) page.
If the screen glides for a beat on every zoom and you would rather it snapped, that is the smooth view transition controlled by VTENABLE. It defaults to 3 and accepts 0 to 7, summed from three bits: 1 for panning and zooming, 2 for view angle changes, 4 for scripts.
| Set it to | Result |
|---|---|
2 | Transitions off for zoom and pan, still on for view angle changes |
0 | Every view transition off |
3 | The default, on for both |
2 is usually the right choice: zooming responds instantly while orbiting a 3D view stays smooth. The VTENABLE (System Variable) page lists all eight values.
The eight options of the ZOOM command
Type ZOOM, or the alias Z, then press Enter. The prompt runs to two lines and holds every option.
Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>:
The default in angle brackets is real time: press Enter straight away and you drag the mouse to zoom. Hold the left button and drag up to magnify, down to shrink, Esc to leave.
| Type | Option | What it does |
|---|---|---|
A | All | Shows the LIMITS area as well as every drawn object |
C | Center | Asks for a centre point, then a view height |
D | Dynamic | Drag a frame over the whole drawing to choose what to view. Predates the scroll wheel and is now rarely used |
E | Extents | Every object fits the screen. The one used most |
P | Previous | Steps back to the previous view. Twenty are remembered |
S | Scale | Asks for a factor. Read the next section before using it |
W | Window | Frame an area with two corners |
O | Object | Select objects and they fill the screen |
All eight also sit on the drop-down of the Zoom button on the navigation bar, at the right-hand edge of the drawing area.
The X suffix: the slip that loses your drawing
This is what leaves people staring at a blank screen after Zoom Scale, convinced the drawing has gone.
With an X, the number is relative to the view you are in now. 2x always doubles the magnification from wherever you are, however many times you repeat it. 0.5x halves it.
Without an X, the number is relative to the LIMITS area. On a building drawing LIMITS usually bears no relation to the plan, so the result lands somewhere unpredictable.
A concrete case shows the scale of it: on a drawing whose LIMITS are 420 by 297, typing a bare 2 gives a view 148 units high — smaller than a single brick. A plan 21600 long is then entirely off screen.
The safe rule: always type the X, unless you know exactly what the drawing's LIMITS are.
To prove it to yourself, use VIEWSIZE, which stores the height of the current view in drawing units. Read it before and after each command and you can see what the command did:
- Type
VIEWSIZEand press Enter. Write the number down. - Type
Z, Enter, then1x, Enter. ReadVIEWSIZEagain: unchanged. A factor of1xmeans keep as is. - Type
Z, Enter, then2x, Enter.VIEWSIZEis now exactly half. Half the view height means twice the magnification. - Type
ZthenE. The whole drawing fits, andVIEWSIZEjumps to the real height of the drawing.
Step 2 is the test worth running: if the number moves, your reading of the X suffix is wrong.
The XP factor: setting viewport scale in a layout
There is a second factor, and it belongs only in a layout. XP means relative to paper space, not to the current view.
To set the scale of a viewport:
- Type
MSPACEto step inside the viewport. - Type
ZOOMand press Enter. - Type
1/100XPand press Enter. That viewport is now at 1:100.
This is the older method but it still works, and it shows that viewport scale is simply a number. Two more modern routes: select the viewport from paper space and read the Viewport Scale box on the status bar, or open the Properties palette and set Standard scale. Properties is the most reliable because the number can be read back.
PAN, and the version with a minus sign
Holding the wheel and dragging covers most panning. But the PAN command has two versions for two different jobs.
Type PAN and press Enter: the cursor becomes a hand, you hold the left button and drag, then press Esc. This is the by eye version, with no numbers in it.
Type -PAN, minus sign first: no hand this time. The program asks for a base point and then a second point. Enter 0,0 then 3600,0 and the view slides exactly one column bay, no more and no less.
The minus version is the only one that can be written into a script file, because a script cannot drag a mouse.
When the wheel stops shrinking the view
If rolling the wheel no longer makes anything smaller, you have hit the zoom-out limit of the current view. Type Z then E to jump back to the actual extents of the drawing.
If Z E still shows nothing — or shows the drawing as a speck in one corner — there is an object sitting far from the origin, usually pasted in by accident. Zoom Extents has to enclose that stray object, so the real plan gets squeezed to nothing.
To find it: type Z then E for the overview, then window-select the far region to see what is there. Delete the stray object, run Z E again, and the drawing behaves normally.
Frequently asked questions
What is the alias for the zoom command in AutoCAD?
Type Z and press Enter, then the letter of the option — E for Extents, W for Window, and so on.
How do I shrink an object in AutoCAD?
That is not ZOOM but the SCALE command. ZOOM only moves the viewpoint; measure the object afterwards and it is unchanged.
Why does Zoom Scale make my drawing disappear?
Because the factor was typed without an X. A bare number is relative to LIMITS, which rarely matches a building plan. Always include the X.
The mouse wheel jumps too far — where do I change it?
Type ZOOMFACTOR and set it to somewhere around 20 to 30 instead of the default 60.
Zoom Extents runs but the drawing is a speck in the corner. Why?
An object is sitting far from the origin, usually pasted in by mistake. Find it, delete it, then run Z E again.
Related articles
- What is AutoCAD — a handbook for people working in construction
- Object snap in AutoCAD — turning it on, tuning it and fixing snaps that fail
- How to draw an arrow in CAD — MLEADER annotation, solid arrows and symbol arrows
- What advanced AutoCAD covers — ten job skills once the drawing commands are second nature