Welcome to Calculator 3.0 for Apple Watch, iPhone, iPad, and iMessage!

Frustrated with the ugly and complicated Calculators for iPad, Apple Watch, and Apple TV — Calculator 3.0 was created to provide a better simpler choice....all for Free.

The "Original Calculator with Themes for iPad and Apple Watch" is back — Rewritten and redesigned for Apple Watch, iPhone, iPad, and iMessage with Bolder Fonts, iPad Multitasking, Native Watch Support with Complications, and Snappier Performance.

Apple Watch
The Apple Watch Calculator with Colored Watch Band Themes!
Designed for the mobile mathematician with a Scientific Calculator, Tip Calculator, Unit Converter, a Tally Counter, Twenty-Six personalized colored themes for your watch band or style, and...
• Force Press (firmly press) on the Calculator to changes themes
• Big and bold fonts for readability
• Haptic feedback upon button presses
• Watch Face Complication support for quick access
• Tip Calculator with Digital Crown support
• Conversion Calculator with Length, Weight, Volume, Area, and Time units
• Counter, Tap to increase or use the Digital Crown for faster input, force press for options
• Settings, with option to enable Counter number modular face complication support
• Autorotation to Share, when enabled the app rotates when rotating your wrist to show a calculation, tip percentage, unit conversion, or tally number to another person

iPhone and iPad
• Simple bubble dark interface with Scientific Calculator
• iPad Multitasking Support (Landscape and Portrait)
• Haptic feedback upon button presses (iPhone 7 and greater)
• Gesture Controls, Swipe Up for "Light Mode", Swipe Down for "Dark Mode", Swipe Left to clear the displayed number
• 3D Touch Icon — Copy Last Number (iPhone 6s and greater)
• Bolder fonts
• Tap number to copy
• "Drag and Drop" support for iPad, perfect for iPad Multitasking
- Tap and hold on the displayed number to select for dragging as text into another app
- Drag and Drop text numbers from other apps (Mail, Safari, Notes, etc) over the displayed number area to include the number in the current input

iMessage app
• Simple Calculator
• Tap number to paste into message thread

What’s New

Version 3.32

Updated interface for iPad Pro 11 inch

Ratings and Reviews

4.7 out of 5
2K Ratings

2K Ratings

ChilliTrav ,

Exactly what I want in a calc!

I’ve tried a bunch of calculators on my iPad. They were all cumbersome to use, had a poor GUI, or focused too much on features I don’t use while making those I do use a pain (thus cumbersome to use). Some of them didn’t even have an easy way to store a number in memory! I mostly use a calculator for quick dilution and cell counting calculations in the lab. So, Hingis like a handy exponential function are key (if I want graphing, regression analysis, or model making, I’ll use my friggin computer). For what I want in an iPad calculator, this one is perfect! It has a simple, elegant looking interface (closest one to the iPhone calculator I’ve seen), and is quick and easy to use, but also has plenty of powerful/diverse functionality for my purposes. I agree with others that it’d be worth paying for, but there’s something I find very appealing about an honor system-based option to leave “tips” (something from my strident open source free-/share-ware days, I guess). So, if you get this app, and you like it, then hit the ℹ️, leave a tip, and support good dev’s 😁.

Developer Response ,

Thank you very much for leaving a kind review. The support helps, best of luck in all your research.

sonofsphinx ,

Supports iPad, iPhone & Apple Watch, Tips payment!

I have seen too many competitors that don’t offer an Apple Watch companion app and those that did wanted a monthly subscription for “technical support” issues...for a calculator app? Why do I need multiple themes and technical support for simple calculations on my devices?

It is a shame that we have gotten to iOS 11 and there is still no native Calculator from Apple on even the iPad Pro! I doubt a native app for the Apple Watch will ever see the light. I use this device for work and must quickly add simple and moderately complex math on the fly. Until that day comes, this app will definitely do the trick!

I am a huge fan that the Split View and new Dock, Drag & Drop features with with this app! A simple swipe up to change between light mode and dark mode was clever! My favorite feature, no ads or monthly subscription required! For this I tipped the maximum because I really, really believe this app was done right!

I agree with another reviewer that I would have paid for this app, but maybe the tip feature is a better go. I imagine if the developer keeps adding new and useful features that I really enjoy, I would keep tipping! 😊

Developer Response ,

Thank you for the Review and Tip. Great to hear you enjoy the app! Reviews ensure I keep the app updated with the goal of providing all users no matter their device a simple easy to use scientific calculator. (No ads, 100 themes, weird fonts, or hidden purchases). Until Apple provides a calculator for iPad, Apple Watch and Apple TV — Calculator 3.0 will be here.

Buckwheat Fujimoto ,

Near Perfect

I’ve tried several different calculator apps, but was primarily looking for one that would work well on my Apple Watch and offer haptic feedback. This one is FINALLY exactly what I was looking for!

Just a perfect blend of simplicity and customization options, along with an easy to use tip calculator. And all for free! I will be putting a little something in the developer’s “tip jar,” because hey, this app is so worth it!

Only possible improvement would be if I could make the “click” when pushing buttons a bit louder. Other than that, this one is perfection!


Spencer Brown
27.7 MB

Requires iOS 9.0 and watchOS 3.0 or later. Compatible with iPhone 5S, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPad Air, iPad Air Wi‑Fi + Cellular, iPad mini 2, iPad mini 2 Wi‑Fi + Cellular, iPad Air 2, iPad Air 2 Wi‑Fi + Cellular, iPad mini 3, iPad mini 3 Wi‑Fi + Cellular, iPad mini 4, iPad mini 4 Wi‑Fi + Cellular, iPad Pro (12.9‑inch), iPad Pro (12.9‑inch) Wi-Fi + Cellular, iPad Pro (9.7‑inch), iPad Pro (9.7‑inch) Wi‑Fi + Cellular, iPad (5th generation), iPad (5th generation) Wi‑Fi + Cellular, iPad Pro (12.9‑inch) (2nd generation), iPad Pro (12.9‑inch) (2nd generation) Wi‑Fi + Cellular, iPad Pro (10.5‑inch), iPad Pro (10.5‑inch) Wi‑Fi + Cellular, iPad (6th generation), iPad Wi‑Fi + Cellular (6th generation), iPad Pro (11‑inch), iPad Pro (11‑inch) Wi‑Fi + Cellular, iPad Pro (12.9‑inch) (3rd generation), iPad Pro (12.9‑inch) (3rd generation) Wi‑Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi‑Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi‑Fi + Cellular, iPad (7th generation), iPad (7th generation) Wi‑Fi + Cellular, iPod touch (6th generation), and iPod touch (7th generation). Apple TV.



Age Rating
In-App Purchases
  1. a Nice Tip $0.99
  2. a Generous Tip $2.99
  3. an Amazing Tip! $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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