ERR:WINDOW RANGE means your graphing window settings are mathematically impossible, so the calculator refuses to draw anything. It's one of the easiest TI-84 errors to fix — usually one wrong number in the WINDOW menu. Here's how to find it and clear the error in under a minute.
What causes ERR:WINDOW RANGE
The TI-84 throws this error when the window boundaries don't make sense:
- Xmin ≥ Xmax — the left edge of the window is at or past the right edge
- Ymin ≥ Ymax — the bottom of the window is at or past the top
- Invalid step values in sequence graphing or table settings
The most common cause by far: you typed a negative value with the wrong key, or you swapped a min and max value while rushing before a test.
When the error appears, choose 1: Quit to return to the home screen, then fix the window as described below.
The 30-second fix: check your WINDOW settings
- Press
WINDOW. - Check that Xmin is less than Xmax. For example, Xmin = −10 and Xmax = 10 works; Xmin = 10 and Xmax = −10 does not.
- Check that Ymin is less than Ymax the same way.
- Press
GRAPHagain.
That's it for most cases. If the numbers look right but the error persists, read the next section — the minus sign is probably the culprit.
Watch out: (-) is not the same as minus
The TI-84 has two different keys that look like a minus sign:
| Key | What it does | Where it is |
|---|---|---|
(-) | Negative sign (makes a number negative) | Bottom row, left of ENTER |
− | Subtraction (subtracts two numbers) | Right column, above + |
When you enter a negative window value like Xmin = −10, you must use the (-) key. Using the subtraction key in a window field can produce errors or values you didn't intend. If your window values keep coming out wrong, retype them slowly with (-).
Instant reset: ZStandard
Don't want to debug numbers one by one? Reset the window to a sane default:
- Press
ZOOM. - Choose
6: ZStandard.
This immediately sets the window to −10 to 10 on both axes and redraws the graph. It's the fastest way to get out of any broken window state, and it's the first thing to try when you're stressed and just need a working graph.
Auto-fit the window: ZoomFit
ZStandard is great, but if your function lives far outside the −10 to 10 range (say, a parabola with a vertex at y = 500), you'll get a working window and still see nothing useful. In that case:
- Press
ZOOM. - Choose
0: ZoomFit.
ZoomFit keeps your current X range and automatically adjusts Ymin and Ymax so the function fits vertically on the screen. It's the quickest way to actually see the curve after clearing the error.
Quick reference
| Symptom | Fix |
|---|---|
| ERR:WINDOW RANGE appears | WINDOW, make Xmin < Xmax and Ymin < Ymax |
| Negative values acting weird | Retype them with the (-) key, not subtraction |
| Just want it working now | ZOOM 6: ZStandard |
| Window is valid but curve is off-screen | ZOOM 0: ZoomFit |
Graph is blank but there's no error?
If you press GRAPH and get a clean, empty grid with no error message, that's a different problem — your equation may be deselected, a plot may be off, or the function is simply outside the window. See /error-fixes/graph-not-showing/ for that fix, and check /error-fixes/error-messages/ for the full list of TI-84 error messages.
Try it right now
Want to test the fix without touching your handheld? Open the free online TI-84 calculator — a full TI-84 Plus CE that runs in your browser, no download needed. Press WINDOW, break the settings on purpose, and practice the ZStandard reset until it's muscle memory.