On my desktop PC with its two 24-inch screens, the Calculator app is the most useless thing ever.

You can use it to do all the things you'd want to do with a calculator.

On a small Windows tablet, like the Acer Iconia W4, the calculator app works fine. It is, to me, the epitome of everything that's wrong with the one-size-fits-all approach of Windows 8.1. The Calculator app, really? Let me explain. Windows 8.1 works well on standard PCs, but you can almost feel Microsoft's disapproval when you're controlling the OS with a mouse and keyboard - 'But that's not how it's meant to be used!' As a desktop user there are various elements of the new OS which annoy me, but none more so than the Calculator app. Windows 8.1 (like Windows 8) fits best on tablets, but tweaks had to be made to ensure it runs on smaller screen sizes. A bit like trying to make one suit fit four people with different body shapes. It's built on the idea of a one-size-fits-all operating system, but in order to get it to work across tablets, desktop PCs, laptops and hybrids, Microsoft has had to make various compromises. But at the same time it - and its predecessor - is based on a slightly flawed concept.

Calculator for windows 8