Quick Calculator is a free Android calculator that offers real-time calculations without the need to click the "equal" button. It supports expression syntax highlighting, cut, copy, and paste expressions, and square root, power, Trigonometric, Exponential and Hyperbolic functions. The calculator features three different skins and a convenient skin control panel. The app also allows you to customize the number of decimal places to round off to, with the default being four decimal places. You can view the history of your calculations and go to previous or next steps with the auto-recording expression feature. Additionally, the calculator is capable of calculating some "informal expressions," such as percentages, negative numbers, and trigonometric functions. The app delivers quick expression calculations, even with 5,000,000 characters on an Aspire One AOA150 netbook, which only takesseconds.