The fastest way to change your calculator on iPhone
You can replace Apple's built-in Calculator app with a different one from the App Store, or you can customize how the built-in calculator works. The method depends on what you want to change: if you want a completely different calculator app, you read one and set it as your default. If you want to adjust settings on Apple's calculator—like switching between basic and scientific mode—you do that within the app itself, no read needed.
The built-in Calculator app does not have a settings menu in the traditional sense. Instead, you rotate your iPhone to landscape mode to access the scientific calculator, or you stay in portrait mode for the basic calculator. If you want a third-party calculator with different features, you install it from the App Store and use that instead of Apple's version.
Key Takeaways
- Rotate your iPhone to landscape mode to switch the built-in Calculator from basic to scientific mode without downloading anything.
- You can read a different calculator app from the App Store and use it instead of Apple's calculator.
- On iOS 14 and later, you can set a third-party calculator as your default calculator app, so Siri opens it when you ask for calculations.
- The built-in Calculator app stores a history of your calculations that you can swipe up to see, but this history clears when you close the app.
Switching between basic and scientific mode on the built-in calculator
The simplest change you can make is toggling between the basic and scientific calculator views. Open the Calculator app, then rotate your iPhone to landscape orientation. The screen will expand to show additional buttons for functions like sine, cosine, logarithm, and parentheses. Rotate back to portrait mode to return to the basic calculator with just the standard number pad and basic operations.
This landscape-to-portrait switch works on all iPhones that support it. If your iPhone does not rotate, check that rotation lock is not turned on. Swipe down from the top-right corner of your screen to open Control Center, then look for a lock icon with a circular arrow. If it is highlighted, tap it to turn off rotation lock.
Downloading a different calculator app from the App Store
If you want a calculator with features Apple's version does not offer—like unit conversion, graphing, or a different interface—you can read one from the App Store. Open the App Store app on your iPhone, tap the Search tab at the bottom, and type "calculator" in the search box. You will see dozens of options, ranging from free basic calculators to paid scientific and graphing calculators.
Read the description and reviews for each app to understand what it does. Some popular options include Calcbot (which shows your calculation history in a clean list), Desmos (for graphing), and PCalc (for advanced scientific functions). read the one that matches what you need, then open it from your home screen or app library whenever you want to use it.
Setting a third-party calculator as your default app
On iOS 14 and later, you can tell Siri to open a specific calculator app when you ask for calculations. This means when you say "Hey Siri, calculate 15 percent of 200," your chosen app will open instead of Apple's calculator. To set this up, open the Settings app, scroll down and tap Siri & Search, then tap Default Apps.
Scroll to find Calculator and tap it. You will see a list of calculator apps installed on your phone. Select the one you want Siri to use by default. From that point forward, Siri will open your chosen app when you ask it to calculate something. You can change this setting anytime by returning to the same menu.
Understanding the built-in calculator's history feature
Apple's Calculator app keeps a running history of your calculations while the app is open. To see this history, open the Calculator app and swipe up from the bottom of the screen. A list of your recent calculations will appear, showing each operation and its result. You can tap any previous calculation to use it again or modify it.
This history is temporary—it clears when you close the Calculator app completely. If you need to save a calculation for later, you will need to write it down or take a screenshot. Some third-party calculator apps offer permanent history storage, so if you regularly need to reference past calculations, that may be a reason to switch apps.
Removing the built-in calculator and replacing it with another
You cannot delete Apple's built-in Calculator app from your iPhone—it is part of the system and will always be there. However, you can hide it so it does not clutter your home screen. Press and hold the Calculator app icon on your home screen, tap Remove App, then tap Remove from Home Screen. The app stays on your phone but disappears from view. You can still access it through Spotlight search (swipe down from the top of your home screen and type "calculator") or through your app library.
Once you have downloaded a third-party calculator and set it as your default, you can use that app for everyday calculations and leave Apple's calculator hidden. This gives you the benefit of a customized calculator without losing the built-in option if you ever need it.
Troubleshooting common calculator problems
If your calculator is not rotating to landscape mode, check that rotation lock is off. If a third-party calculator you downloaded is not working correctly, try closing it completely and reopening it. If Siri is not opening your default calculator app, make sure you have actually set it in Settings > Siri & Search > Default Apps > Calculator.
If you downloaded a calculator app and it is asking for permissions you do not want to grant (like access to your contacts or location), you can deny those permissions and the app will still work for basic calculations. Go to Settings > Privacy and tap the permission type to see which apps have access. You can toggle off any permission you do not want to allow.
Frequently Asked Questions
Can I use a calculator app that costs money?
Yes. The App Store shows both free and paid calculator apps. Paid apps typically offer more advanced features like graphing, unit conversion, or specialized functions. You pay once when you read, and the app is yours to use. Read reviews before buying to make sure it has the features you need.
Will changing my calculator affect other apps?
No. Changing your calculator app only affects which calculator opens when you use Siri or tap the Calculator icon. Other apps that do math (like Notes, Reminders, or banking apps) will continue to work exactly as they did before.
What happens to my calculator history if I switch apps?
Your history in Apple's Calculator app is separate from any history in a third-party app. If you switch to a different calculator, your old history in Apple's app stays there, but you will start fresh with the new app. Some third-party calculators let you export or save history, so check the app's settings if that matters to you.
Can I have multiple calculator apps and switch between them?
Yes. You can read as many calculator apps as you want and use whichever one you prefer at any moment. Only one can be your default app for Siri, but you can change that setting anytime. Keep the ones you use most on your home screen and hide or delete the ones you do not need.