Carpenter's Calculator

The Carpenter's Calculator is designed to be a simple, versatile calculator that supports the creation and manipulation of fractions and mixed numbers.

Working with US Customary units (feet and inches) often involves measurements in fractions of an inch, and therefore mixed-number arithmetic. For example: you need to rip 6 planks at 3 5/16" width each. Your saw blade kerf is approximately 1/8". To figure out how much width you need in total, you'd do 6 * (3 5/16 + 1/8). You can do this in your head, but it's easy to make a mistake -- and if you add any more complexity, it becomes a challenge. You can do it on paper, but that's a bit cumbersome for such a simple operation. With the Carpenter's Calculator, it's easy.

Even if you're not a woodworker and uninterested in using fractions or mixed numbers, this calculator should offer you just about everything that the built-in iOS calculator offers, but with a feel closer to a traditional scientific or graphing calculator. It also stores your last 20 expressions and results, which makes it very easy to do slightly more complex calculations without needing to whip out a pencil and paper.