Calculator Magic: 151 in One

Calculator Magic is 151 calculators in one app, each one made for its job and drawn so you can see what the numbers mean. Writing a paper or doing homework? The Formula Library holds more than 480 formulas, and you can add your own. Work any formula out for whichever symbol you need, see a graph of how it changes, then copy it straight into your paper: as plain text, or as LaTeX for typeset papers and Word's equation editor, with or without a sentence saying what every symbol means. Start with the calculators everyone needs. Simple has big keys and the four sums. Standard adds percentages and memory. Scientific has every function, and shows your sum the way a textbook writes it: roots over what they cover, powers raised, division as a fraction. Paste a receipt or a column of numbers and it adds them up for you. Then there is everything else: Electronics: the resistor color code both ways, Ohm's law, capacitor and SMD codes, LED resistors, series and parallel, LC resonance, logic gates, 7-segment displays, and IC pinouts with their dimensions. Shapes and bodies: 37 of them, with 3D solids you can turn and flick to spin, and every measurement worked out at once. Unit converters: 24 kinds, with pictures that show how big each unit really is. Money: loans, savings, compound interest, tax brackets you can edit, markup and margin, tips and splitting the bill. Math: fractions, equations, matrices, primes and factors, number bases, statistics. Science: the periodic table, molar mass, physical constants, half-life, and the Formula Library: physics, astronomy, chemistry, electronics, engineering, biology and finance. Tap a formula to read what it means, solve it for any of its symbols and watch a graph of how it changes. Add your own formulas and they get a page just like the others. Everyday: dates, cooking conversions, fuel for a trip, discounts, and a lesson in reading a clock. Health: BMI, heart-rate zones, water and activity guidelines, waist measures and due dates, following U.S. or European guidance that you choose, each with its source. For general information only, not medical advice. On an iPad the calculator can sit beside other apps in Split View, Slide Over and Stage Manager, so you can work out a sum while you read. Make it yours: favorites, light or dark, text from small to huge, your choice of number style and precision, and a history of your recent sums. Every calculator is free to try for 30 days. After that, one payment unlocks them all for good: no subscription and no ads. The Simple and Standard calculators stay free forever. Calculator Magic collects nothing. Your calculations stay on your device.