how to turn off casio calculator

Quick answer

For most Casio scientific calculators, press SHIFT, then press the key with OFF written above it (usually the AC key). That key label above the button is a secondary function, so SHIFT activates it.

• Most scientific models: SHIFT + AC (OFF)
• Many graphing models: SHIFT + AC/ON (OFF)
• If frozen: try reset steps instead of repeatedly pressing power keys

Step-by-step: how to turn off different Casio calculators

1) ClassWiz scientific models (fx-82EX, fx-991EX, fx-570EX, etc.)

This is the most common pattern students use:

• Press SHIFT.
• Press AC (with OFF printed above it).
• The screen should go blank immediately.

2) MS/ES scientific models (fx-991MS, fx-115ES, fx-570ES, etc.)

The logic is the same as ClassWiz:

• Press SHIFT first.
• Then press the key marked with the secondary OFF label.
• On most units, that is the AC key.

3) Graphing models (fx-9750G, fx-9860G, fx-CG50)

Most Casio graphing calculators also use an OFF secondary label:

• Press SHIFT.
• Press the key with OFF above it (often AC/ON area depending on model).
• If you are inside an app, press EXIT first, then do the power-off combo.

4) Financial models (FC series)

Financial Casio units typically follow the same secondary-function pattern:

• Use SHIFT to activate secondary labels.
• Press the corresponding key marked OFF.
• If uncertain, check the top legend text above keys.

What if your Casio calculator will not turn off?

If the normal key combo does nothing, don’t force random keys repeatedly. Try this order:

1. Press AC once to clear the current entry.
2. Try SHIFT + OFF key again.
3. If frozen, use the RESET button (small rear/pinhole button on many models).
4. Restart and set time/mode preferences again if needed.
5. If problems continue, replace battery and verify polarity.

Reset may clear settings, so do it only when normal shutdown does not work.

How to find the OFF key quickly

Casio keyboards often print secondary functions above keys in a different color. To locate OFF:

• Look above AC, ON, or nearby top-right keys.
• Find small text that says OFF.
• Use SHIFT first, then that key.

If there is no OFF legend visible, your model may rely on auto power-off or a different long-press behavior. In that case, check the manual for the exact model number.

Difference between AC, DEL, and OFF

AC (All Clear)

Clears current input or returns to a clean entry line. It does not always power down the calculator.

DEL

Deletes one character at a time and is used for editing expressions.

OFF

Turns the calculator power off. On many Casio units, OFF is a secondary function accessed with SHIFT.

Auto power-off: what it means

Many Casio calculators automatically switch off after several minutes of inactivity to save battery. So if you forget to manually power down, the device usually protects itself. Still, turning it off manually is useful when:

• You want to maximize battery life.
• You are packing it in a bag and want no accidental key presses.
• You are in class/test settings and need a clean start next time.

Battery and maintenance tips

• Use good-quality batteries from trusted brands.
• Keep the protective slide cover on scientific models when stored.
• Avoid extreme heat (car dashboard, direct sun for hours).
• If the display fades, replace battery before it fully dies.
• For solar models, keep the panel clean and exposed to light when possible.

FAQ

Why does SHIFT + AC not work on my calculator?

Either your model uses a different OFF key location, or the calculator is frozen. Check the printed OFF legend and try reset procedures.

Will turning off delete my calculations?

Usually no for basic immediate shutdown, but mode states and temporary memory behavior depend on model. A full reset can clear settings/data.

Can I damage the calculator by turning it off often?

No. Normal power-off is intended for regular daily use.

How do I turn it back on?

Press ON (or AC/ON depending on model). The calculator should boot instantly.

Final takeaway

If you remember one thing, remember this: look for OFF printed above a key, then press SHIFT + that key. That solves shutdown for most Casio calculators. If your unit is unresponsive, use reset carefully and then verify battery condition.