FloatCalc+ is a pop-up calculator that floats over any app, so you can do quick math without leaving your shopping, banking or browser app. The same window converts units and 30+ currencies using daily ECB rates. It has a one-tap operator row, powers, roots and percentages, and keeps the expression on screen after "=" so you can edit it. Copy results, resize, move or fade the window. Free: 60 minutes a day with ads; Pro removes the limit and ads.