To add the calculator to Control Center on an iPhone, open Control Center, tap the + button at the top left, tap Add a Control at the bottom of the screen, and tap Calculator. After that, you can open the calculator with a swipe and a tap from almost anywhere, including the Lock Screen.
These steps are for iOS 18 through iOS 27, which use the redesigned Control Center. If your iPhone runs iOS 11 through iOS 17 (an iPhone 7 tops out at iOS 15), use the Settings method further down. The steps follow Apple’s iPhone User Guide pages on customizing Control Center and the Calculator app.
Check Your iOS Version
- Check your iOS version: go to Settings > General > About and look at iOS Version. That tells you which set of steps to use.
- Make sure Calculator is installed: if you deleted the app, it won’t appear in the controls gallery. Search for it with Spotlight or in the App Library first.
How to Add Calculator to Control Center (iOS 18 and Later)
- Open Control Center. On an iPhone with Face ID, swipe down from the top-right corner. On an iPhone with a Home button, swipe up from the bottom edge.
- Tap the + button at the top left, or touch and hold an empty spot. The controls start to jiggle, and Add a Control appears at the bottom.
- Tap Add a Control. The controls gallery opens with a search field at the top.
- Type “Calculator” in the search field, or scroll to it, and tap Calculator. The button drops into the first open space.
- Drag the Calculator button where you want it.
- Tap an empty area, or swipe up from the bottom center of the screen (press the Home button on older models), to save your layout.
The Calculator button now sits in Control Center. Tap it, and the Calculator app opens over whatever you were doing.
How to Add Calculator on iOS 11 Through iOS 17 (Including iPhone 7)
Older versions of iOS handle Control Center from the Settings app instead:
- Open Settings and tap Control Center.
- On iOS 11 through iOS 13, tap Customize Controls. On iOS 14 through iOS 17, the list is already on this screen.
- Under More Controls, tap the green + next to Calculator. It moves up to the Include list.
- To change its position, drag the three-line handle next to Calculator up or down.
- Open Control Center to confirm the button is there.
To remove it on these versions, tap the red minus next to Calculator under Include, then tap Remove.
How to Move, Resize, or Remove the Calculator Control
Open Control Center and tap + again to edit. You can then:
- Move it: drag the control to a new position.
- Resize it: drag the handle at the lower-right corner of the control.
- Remove it: tap the minus button at the upper left of the control. This only removes the shortcut, not the app.
- Give it its own page: drag the control past the bottom of the current page to start a new group of controls, then swipe between pages.
Control Center saves your layout when you close it.
The same Add a Control steps bring back other buttons, such as the one to turn rotation lock on or off.
Other Fast Ways to Open the Calculator
Control Center is the quickest route on most iPhones, but iOS 18 and later give you a few more:
- Lock Screen button: touch and hold the Lock Screen, tap Customize, choose Lock Screen, tap the minus button on the Flashlight or Camera control, tap the empty spot, and pick Calculator. Tap Done. This works on iPhones with Face ID.
- Action button: on an iPhone with an Action button, open Settings > Action Button, swipe to Controls, tap the button below it, and choose Calculator.
- Search or Siri: swipe down on the Home Screen and type “calc,” or ask Siri to do the math for you.
Can I Use the Calculator From the Lock Screen?
Yes. When Calculator is in Control Center, you can open it from the Lock Screen without unlocking your iPhone. Anything beyond the calculator still needs your passcode.
If Control Center doesn’t open on the Lock Screen, go to Settings > Face ID & Passcode (or Touch ID & Passcode), enter your passcode, and turn on Control Center under Allow Access When Locked. That setting is explained further in using Control Center on the Lock Screen.
Calculator Not in the Controls Gallery?
- The app was deleted: deleting Calculator also removes it from Control Center. Open the App Store, search for “Calculator,” find Apple’s app, and tap the download button. Then add the control again.
- You’re searching on an old version: on iOS 17 or earlier there’s no controls gallery. Use Settings > Control Center instead.
- Control Center won’t open inside apps: go to Settings > Control Center and turn on Access Within Apps.
- You see the button but nothing happens: close Control Center, force the Calculator app closed from the App Switcher, then try again. Restart the iPhone if it still won’t open.
Calculator Tips
- Switch modes: in the Calculator app, tap the calculator button at the bottom left, then choose Basic, Scientific, Math Notes, or Convert for unit and currency conversions. See Apple’s scientific calculator guide for the advanced keys.
- See earlier answers: Calculator keeps a history of recent calculations you can open from the same menu.
- Delete a digit: tap the delete key to remove the last digit. Tap C to clear the last number or AC to clear the whole expression.
- Copy a result: touch and hold the result in the display, then tap Copy.
- Repeat an operation: tap the equal sign again to apply the last operation to the current result. For example, 1 × 2 = gives 2, and each extra tap of = doubles it.
Control Center Calculator Questions
Can Siri do the math instead?
Yes. Ask something like “What’s 18 percent of 225?” and Siri answers without opening the app. See Apple’s basic calculator guide for more on the app itself.
Does the calculator use order of operations?
Yes. The Calculator app follows the standard order of operations, so multiplication and division happen before addition and subtraction. Here’s how to use parentheses on the iPhone Calculator when you want part of a problem worked out first.
Is there a calculator on iPad?
Yes. Apple added Calculator, including Math Notes, to iPad with iPadOS 18. Older iPad versions don’t include it.
Where is the scientific calculator?
On iOS 18 and later, switch modes from the calculator button in the app. On older versions, turn the iPhone sideways with Portrait Orientation Lock off. Both modes are shown in finding the other calculator on an iPhone.
Once Calculator is in place, add any other tools you reach for often, like Flashlight or Screen Recording, with the same Add a Control steps.
Matthew Burleigh is the founder, head writer, and editor of Solve Your Tech, which he launched in 2012. He has written technology tutorials since 2008 and worked in IT since 2003, including small-business support, IT management, and consulting. He holds Bachelor’s and Master’s degrees in Computer Science from Arizona State University.
Matthew writes practical guides for Windows, iPhone and iPad, Microsoft Office, Outlook, Google apps, and Android. Solve Your Tech’s guides are checked step by step against the device or app maker’s own documentation and tested on his own devices whenever he has the hardware or software, with clear steps, sources, and update dates.
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