Beginners meet the grid in AutoCAD first and get annoyed by it first. It is the first thing on screen in a new drawing and the first thing most people want gone. The screen fills with squares, it clutters the view, and after switching it off the cursor still jumps from notch to notch as if magnetised.
The reason is short and rarely spelled out: those are two different things, run by two different system variables. This article measures both by pressing the actual keys on AutoCAD 2027 at the Institute. To learn AutoCAD properly from the beginning, see the AutoCAD for Construction course.
Grid display and grid snap are separate
What you see is the grid, controlled by GRIDMODE. What makes the cursor jump is grid snap, controlled by SNAPMODE.
They are entirely independent, which is why the grid in AutoCAD can be off while the cursor still snaps. We measured it by pressing the keys and reading both variables after each press.
| Key pressed | GRIDMODE | SNAPMODE |
|---|---|---|
| (before pressing) | 0 | 0 |
| F7 | 1 | 0 |
| F9 | 1 | 1 |
| F7 again | 0 | 1 |
| F9 again | 0 | 0 |
The fourth row answers the question in the title. After F7 turns the grid off, SNAPMODE is still 1, so the cursor still jumps. To stop it, press F9 as well.
Three ways to turn the grid off
All three give identical results, so use whichever is nearest to hand.
| Route | What you do |
|---|---|
| Function key | press F7 |
| System variable | type GRIDMODE, enter 0 |
| Command | type GRID, choose OFF |
The GRID prompt on the 2027 release, copied verbatim.
Specify grid spacing(X) or [ON/OFF/Snap/Major/aDaptive/Limits/Follow/Aspect] <10.0>:
The number in angle brackets is the current grid spacing. Typing a number straight in changes the spacing without opening any dialog.
Turning grid snap off works the same three ways under different names: F9, the SNAPMODE variable, or the SNAP command with OFF.
What grid spacing suits construction drawings
The sample drawing we opened had GRIDUNIT of 10 and 10. On a millimetre drawing a 10 mm grid is far too dense and the screen becomes nothing but squares.
A few working values:
| Drawing type | Sensible spacing |
|---|---|
| Construction details, 1:5 to 1:20 | 50 or 100 |
| Architectural plans, 1:100 | 500 or 1000 |
| Site plans, 1:500 | 5000 |
GRIDMAJOR decides how many squares sit between heavy lines. The sample drawing uses 5, which is sensible: a 500 spacing with a heavy line every 2500 gives you a ruler on screen.
Why the 2027 release never says the grid is too dense
Long-time AutoCAD users remember the message about the grid being too dense to display, which appeared whenever the spacing was small relative to the view.
We tried to reproduce it on the 2027 release. We set the grid spacing to 1 in a view 6000 units wide — over six thousand squares across the screen — and ran REGEN. No message at all.
We tried again with a control: adaptive display switched off by setting GRIDDISPLAY to 1 instead of 3. Still no message.
The measured conclusion: on the 2027 release, too fine a spacing makes the software thin the grid rather than complain. That is an improvement, but it also means you no longer get a warning when the spacing is set wrong. To know the real spacing, read GRIDUNIT.
GRIDDISPLAY, and why the grid spills past the sheet
The sample drawing had LIMMAX of 210000 and 148500 — an A4 sheet at 1:1000 — and yet the grid appeared everywhere, well outside that area.
The reason is GRIDDISPLAY, measured at 3. Autodesk's GRIDDISPLAY page describes it in one line: "Controls the display behavior and display limits of the grid." A value of 3 is the sum of two bits.
| Bit | Autodesk's wording |
|---|---|
| 0 | "Restricts the grid to the area specified by the LIMITS command" |
| 1 | "Does not restrict the grid to the area specified by the LIMITS command" |
| 2 | "Turns on adaptive grid display, which limits the density of the grid when zoomed out" |
| 4 | "If the grid is set to adaptive display and when zoomed in, generates additional, more closely spaced grid lines" |
| 8 | "Changes the grid plane to follow the XY plane of the dynamic UCS" |
Bit 4 is worth trying. Setting GRIDDISPLAY to 7 makes AutoCAD subdivide the squares as you zoom in. For detailing work where you still want a grid for reference, that is the best setting.
Setting GRIDDISPLAY to 0 confines the grid to the drawing limits, which is how the grid becomes a virtual sheet of paper: set LIMITS to the paper size times the scale and the grid draws to the edge of the sheet.
The grid in a layout is a separate state
A detail few references mention, and one we measured to be sure. Turn the grid on in model space, switch to a layout, read the variables, then switch back and read again.
| Where | GRIDMODE | GRIDUNIT |
|---|---|---|
| Model tab | 1 | 500 and 500 |
| Switched to Layout1 | 0 | 0.5 and 0.5 |
| Back on the Model tab | 1 | 500 and 500 |
Those three rows say it all. Each space keeps its own grid state, and turning the grid off in a layout does nothing to the grid in model space.
The 0.5 in the middle row matters too. A layout grid lives in paper space and is measured in paper units, so 0.5 is half a millimetre on the printed sheet, while 500 in model space is five hundred millimetres in the real world. Same variable name, two completely different rulers.
Knowing that makes the layout grid useful: set the spacing to 10 and you have one-centimetre squares on paper, handy for lining up the title block and the viewports. Switch it off when the alignment is done. Working inside layouts is covered in our article on rotating a drawing in a layout.
Snap spacing does not have to match the grid
One setting people rarely separate: GRIDUNIT and SNAPUNIT are different variables, and they do not have to hold the same numbers.
The sample drawing had both at 10 and 10, which is the default pairing and the reason most people assume they are one thing. They are not.
A pairing that works well in practice is a coarse grid for reading and a fine snap for drawing. Set the grid to 1000 so the screen stays legible, and the snap to 100 so the cursor lands on sensible round numbers. The grid then works as a ruler rather than as a constraint.
The reverse pairing is worth avoiding. A fine grid with a coarse snap gives you a screen full of squares that the cursor cannot reach, which is confusing for no benefit at all.
With the grid off, what keeps the drawing straight
People feel adrift after turning the grid off. In truth the grid is the weakest of AutoCAD's four precision aids.
| Aid | Key | What it does |
|---|---|---|
| Ortho | F8 | forces the cursor horizontal or vertical |
| Polar tracking | F10 | suggests directions at declared angles |
| Object snap | F3 | latches onto real points on existing geometry |
| Grid snap | F9 | jumps on a fixed lattice, unrelated to the geometry |
The first three attach to real geometry, so they are exact. Grid snap only jumps on a lattice, and if your drawing does not sit on that lattice it actively hurts. That is why working drafters almost always leave SNAPMODE off and live on F3 and F8. Object snap is covered in our article on object snap in AutoCAD.
Three things often repeated that are not true
| Often repeated | What we measured on the 2027 release |
|---|---|
| F7 stops the cursor jumping | F7 only changes GRIDMODE; SNAPMODE stays, so press F9 too |
| A grid that is too dense produces a warning | Measured twice, including with adaptive display off, and no message appeared |
The grid only shows inside LIMITS | It depends on GRIDDISPLAY; the drawing measured 3, so the grid shows everywhere |
Frequently asked questions
Which key turns the grid off?
F7. We pressed it and read the variables: GRIDMODE went from 1 to 0 and SNAPMODE did not change.
The grid is off but the cursor still jumps.
Press F9 as well. That is grid snap, a separate mode controlled by SNAPMODE.
How do I start every new drawing without a grid?
Set GRIDMODE to 0 and save it into the .dwt template. Every drawing made from that template opens without a grid.
What spacing should a floor plan use?
500 or 1000 on a millimetre drawing at 1:100. Leave GRIDMAJOR at 5 and a heavy line falls every 2500.
Can I have a grid without the cursor snapping?
Yes, and that is the normal way to work. Press F7 for the grid and leave F9 off. The squares then serve as a ruler while the cursor still moves freely, which is what most drafters want.
Does the grid print?
No. The grid is a screen aid rather than an object in the drawing, so there is nothing to plot.