PCalc if one of the best calculator apps available for iPhone and iPad. Now it presents a quick access calculator to the Today screen. This widget is just one facet of the premium calculator app. If you find yourself constantly making calculations, unit conversions, even solving scientific equations, PCalc is the widgetized app you need.

PCalc is just one of our favorite widgets for iPhone and iPad. We’ve collected all of our favorites here. And if you’d like to see more of our top app selections in different categories, just head on over to our Best Apps Series.

PCalc - The Best CalculatorTLA Systems Ltd.Utilities$9.99Download

Here are a couple of our other picks of the best widgets for iPhone and iPad:

Thessa – Control your Nest Thermostat from your iPhone Today Screen

Thessa is a new widget that will let you interact with your Nest Thermostat right from the Today Screen. Without even unlocking your iPhone, simply slide down from the top of screen and see and change your home temperature. The app cleverly displays temperature interval buttons. So it's easy to ...

Yahoo Weather – A refreshing look at your current conditions

Surprisingly Yahoo has made a fantastic iPhone and iPad app for weather. What’s great about Yahoo Weather is it’s user interface. The app gives you a nice forecast of daily and nightly weather with written descriptions of rain and snow accumulations, a feature lacking in many weather apps. The app ...