You can change your default calculator on iPhone, but Apple limits your options
iPhone comes with Apple's built-in Calculator app, and you cannot replace it as your system calculator — iOS does not let you set a different default the way Android does. However, you can read a different calculator app from the App Store and use it instead of Apple's version. The built-in app will still exist, but you can hide it or straightforward ignore it and open your preferred calculator whenever you need one.
The limitation exists because Apple controls which apps can perform certain system-level functions. If you want a calculator with different features — scientific functions, unit conversion, calculation history, or a different interface — your only option is to read a third-party app and make it your habit to open that instead.
Key Takeaways
- Apple's Calculator app cannot be replaced as your default, but you can read a different calculator from the App Store and use it as your primary choice.
- You can hide the built-in Calculator app from your home screen by moving it to the App Library, making it harder to open by accident.
- Third-party calculators offer features the built-in app lacks, such as calculation history, scientific functions, and unit conversion tools.
- Siri will still use Apple's Calculator when you ask it to do math, regardless of which app you prefer to use manually.
How to hide the built-in Calculator app
If you want to stop seeing Apple's Calculator on your home screen, you can move it to the App Library — the folder system iOS creates automatically. Press and hold the Calculator icon on your home screen until a menu appears. Tap Remove App, then select Remove from Home Screen. The app stays on your phone and remains functional, but it moves out of sight.
To open the hidden Calculator later, swipe to your App Library (the last screen after all your home screens), then scroll to the Utilities section and tap Calculator. You can also search for it by swiping down from the middle of your home screen and typing "calculator" in the search box.
How to read and use a different calculator app
Open the App Store on your iPhone and search for "calculator." Several options appear — some free, some paid. Read the description and reviews to find one that matches what you need. Common alternatives include Calzy (which shows your calculation history), Soulver (which lets you write math in sentences), and Numi (which handles unit conversion and multiple calculation types).
Tap Get next to the app you want, then authenticate with Face ID, Touch ID, or your Apple ID password. Once installed, the app appears on your home screen or in your App Library. Open it the same way you would open any other app. You can move it to your home screen by pressing and holding the icon and selecting Add to Home Screen if you use it frequently.
What the built-in Calculator app can and cannot do
Apple's Calculator handles basic arithmetic, percentages, and square roots. It has a scientific mode (rotate your phone to landscape) that adds trigonometry, logarithms, and other advanced functions. It does not store your calculation history, so if you close the app or clear it, your previous calculations disappear. It also cannot convert units or currencies.
If you need any of those missing features, a third-party app is your only choice. The trade-off is that third-party apps take up storage space and may show ads or require payment, whereas Apple's Calculator is always there and uses minimal space.
Why Siri still uses Apple's Calculator
When you ask Siri to do math — "Hey Siri, what is 15 percent of 200?" — Siri uses Apple's Calculator engine to compute the answer, regardless of which calculator app you have downloaded. You cannot change this behavior. Siri will show you the result in a card on your screen, and if you tap it, the built-in Calculator app opens.
This is one reason some people keep the built-in app on their home screen even if they prefer a different calculator for manual use. If you use Siri for math frequently, you may want to keep Apple's Calculator accessible rather than hiding it in the App Library.
Comparing third-party calculators: what to look for
Before downloading, think about what features matter to you. If you do a lot of quick math, a straightforward interface is more important than advanced functions. If you work with measurements or currencies, look for unit and currency conversion. If you often need to review past calculations, search for an app that stores history. If you do scientific or engineering work, check that the app includes the specific functions you need.
Most third-party calculators offer a free version with basic features and a paid upgrade for advanced ones. Try the free version first to see whether the interface feels natural to you. Some apps also let you customize the appearance — dark mode, different colors, larger buttons — which can matter if you use the calculator frequently.
Moving a third-party calculator to your home screen
Once you have downloaded a calculator app, you can place it on your home screen for quick access. Press and hold the app icon in your App Library or home screen, then tap Add to Home Screen. You can also drag the icon directly to an empty spot on any home screen. If you want it in a specific location, drag it to the exact position before releasing.
You can create a folder for calculator and math tools by dragging one app onto another. Press and hold one app, drag it on top of a second app, and iOS creates a folder automatically. Name it whatever you like — "Math Tools" or "Calculators" — and add more apps to it by dragging them in. This keeps your home screen organized if you use multiple calculator or math apps.
Frequently Asked Questions
Can I delete the built-in Calculator app completely?
No. Apple's system apps, including Calculator, cannot be deleted from iPhone. You can only hide it by moving it to the App Library. If you need it later, you can search for it or restore it to your home screen.
Will a third-party calculator work offline?
Most calculator apps work offline, including Apple's built-in one. Check the app description in the App Store to confirm, but nearly all basic and scientific calculators function without an internet connection. Apps that convert live currency rates may require internet access for that specific feature.
Do I have to pay for a better calculator?
Many third-party calculators offer free versions with core features and optional paid upgrades. Some are entirely free with ads, and some cost a one-time fee. Try the free version first to see if it meets your needs before spending money.
What happens if I read a calculator app and then delete it?
The app is removed from your phone, but you can read it again from the App Store at any time. Your purchase history is saved, so if you paid for the app, you can reinstall it without paying again.
Can I use multiple calculator apps at the same time?
Yes. You can have Apple's Calculator, a scientific calculator, a unit converter, and any other math app all installed at once. Open whichever one fits the task you are doing. Many people keep a straightforward calculator and a scientific one for different situations.