Step by step
- Use the calculator on this page in Safari for full-width keys and automatic calculation history.
- To open Apple's built-in app, swipe down from the top-right corner (or up from the bottom on older models) for Control Center.
- Tap the Calculator icon, or swipe down on the Home Screen and type Calculator in Search.
- Switch to Scientific mode on this page whenever you need powers, roots, trigonometry, or logarithms.
At a glance
| Option | Best for | Key benefit |
|---|---|---|
| Browser tool on this page | Checking past results | Full-width keys with scrollable history below |
| iPhone Control Center | Quick offline math | Instant access from any screen |
| Spotlight Search | Finding a hidden app | Opens the built-in app if removed from Home Screen |
Where to find it on your device
- iPhone Control Center: Swipe down from top-right corner > Tap Calculator icon
- iPhone Search: Swipe down on Home Screen > Type Calculator
Related questions
How do I find the calculator on my iPhone?
Swipe down from the middle of your Home Screen and type Calculator, or swipe down from the top-right corner to open Control Center.
Does this online calculator work full screen on iPhone?
Yes, the keys fill the width of your phone screen and the history stays below so you can scroll back to earlier results.
Is this a free calculator app for iPhone?
It runs directly in Safari for free with no download or sign-up required.
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Open the full online calculator →
Updated November 14, 2026.