Is there a calculator widget or app that provides a similar experience to the iPhone

[MicroB]

I've been looking for a widget similar to the iPhone where I can calculate the percentage of a number.
Its mainly the percentage that I am looking for when calculating a figure

 

[singe]

Magic Number 2 — OSX Desktop Calculator

Even tho my needs for a calculator are fairly standard the attention to design and detail in this application and multitude of features (history etc) make this a pleasure to use on the desktop.

A bargain at the moment as it's 66% off until 10th Dec.

https://itunes.apple.com/us/app/magic-number-2/id737047715?mt=12

 

[Dave Braine]

The Calculator application on your Mac has a % button.

 

[MicroB]

The stock one does, however the widget does not:

 

[glenthompson]

I use a HP 12C emulator since I'm prefer RPN type calculators. It's available from https://www.macupdate.com/app/mac/29697/hp-12w