Big Calculator Pro

Basic Calculator
Paid Version
(No Ads)
Free Version
(Ad Supported)

New! Widget

A Widget is available as In App Purchase which lets you perform Basic calculations without opening the main app (exclusively available in the Paid version of the app). The Widget is synchronized with the main app so that you can switch back and forth without losing your calculation progress, and pressing Equals on the Widget saves each calculation to the History Tape in the main app.

The Widget has 2 views - compact and expanded, and can accessed in your Today View or by 3D Touch on the app icon.
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・Dual-line display - shows the input and result at the same time

・Percentage and backspace button

・18 color themes

・Multi-line input for really long equations

・Automatic scientific formatting

・VoiceOver accessibility

・Split View


・Swipe left on the display to backspace

・Swipe right on the display to clear

・Tap & hold on the result to copy

・Tap & hold on the input to move the cursor, copy, paste


・Color Theme


URL Scheme



What is the difference between the Paid and Free (Lite) versions?

For most apps, the only difference is that the Free version has ads. The Paid versions of Calculator HD Pro and Calculator Pro Elite also have an exclusive Widget available as an In App Purchase.

How do I use the Widget (Calculator HD Pro & Calculator Pro Elite)?

The Widget can be accessed in your Today View or by 3D Touch on the app icon. For more information, please visit Apple at

How do I restore an In App Purchase, or install it on another device?

From within the app, go to Settings, and scroll down to the bottom of the first page and tap Restore Purchases.

Do I have to pay for the app on each device I own?

No, you only have to pay once and then you can download it again for free onto all of your devices.

The app is universal and works with both the iPhone and the iPad.

You can also share your purchase with others in your family if you have Family Sharing enabled on your account.

For more information about Downloading Previous Purchases and Family Sharing, please visit Apple at

Why do I keep getting ads after I paid for them to be removed?

The Paid version of the app is a totally separate app, so look for a new icon on your device without the word Lite on it.

Start using the Paid version from now on, and delete the Free version from your device so that you do not open it by mistake.

Here is what the two different icons look like for reference:

Paid Version
(No Ads)
Free Version
(Ad Supported)