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Calculators and I go way back. In those days, hours of repetitive analysis would be done with a calculator sitting next to a pad of paper—one for running the numbers, the other for keeping track of the logic. Spreadsheets and systems like Matlab and Mathematica have taken the place of both the calculator and the pad of paper when the analysis gets deep and complicated.
For lots of calculations, setting up a spreadsheet is just too fiddly and time-consuming. Calculators are tremendously efficient when the work requires only a handful of operations rather than hundreds.
A good calculator app on your phone can save you a lot of time. But even after eliminating those from consideration, there are still a ridiculous number of calculators available for the iPhone. How can you choose the best one? Just listen to me. Discover how to improve your workflows and get more focus with this free, in-depth guide to productivity. It has to be a real app, not an emulation of a physical calculator. This is not a complaint about skeuomorphism.
It has to be actively developed. Apps like Graphicus can be very useful, especially to students, but our focus here is on efficient calculation, not visualization. It cannot rely on an internet connection. Calca is an interesting idea, and I can see it being very useful on a device with a keyboard, but typing out calculations on an iPhone is inefficient and having extra rows of keys leaves too little room for the display.
Personally, I could never go back to the Apple calculator. There are also some slightly hidden goodies. For example, the return key lets you choose a line reference, the division key lets you do modulo division, and the percent key gives you a few ways of using percentages. The main problem with Soulver, from my point of view, is that its scientific operators—the trig functions, powers, roots, and so on—are on a secondary keyboard.
Even worse, I often need to switch the trig functions from degrees mode to radians mode. PCalc has lots of well-thought-out keyboard layouts and color themes built in. PCalc comes with reasonable defaults for its display and other settings, but it can be customized to a fare-thee-well.
My horizontal layout is also of my own design, with a big set of unit conversions from metric to US customary units.
The ability to personalize is what makes this an app, not a physical calculator. And, once you get it set up the way you want, the app is easier to use because it fits how you work, not how someone thinks you work.
Its combination of features, customizations, and user interface niceties is designed to get your calculations done quickly. PCalc is, in fact, the most promiscuous app I know of. James Thomson believes you should never be far from PCalc. No, I never work with angles measured in radians, but many common engineering formulas include trig functions that arise from the solution of differential equations.
When plugging numbers into these equations, you have to be in radians mode. He went so far as to suggest I buy a new calculator, which is when it dawned on me that he got his wrong answer—and kept getting it every time he recalculated—because he was using the secant formula for buckling with his calculator set to degrees mode. Get Back Hours Per Week Discover how to improve your workflows and get more focus with this free, in-depth guide to productivity.
If you want a calculator that has lots of power features but values its user interface above all, you'll want PCalc.