Dad's Calculator

Dad's Calculator is for the moment you reach for a calculator in your everyday life: the checkout line, the measuring tape, the stove. It keeps a notebook of everything you work out, adds up the lines you pick, and remembers them for next time. Right next to it: a unit converter, a recipe scaler and size charts.

THE CALCULATOR
• Every calculation stays in a notebook-style history. Your math, with receipts
• Percent works the way you say it: 80 - 25% = 60
• Pick the lines you care about and get their sum, average, largest and smallest
• Copy the result, or drop the sum straight into your next calculation
• Name a set of lines (groceries, measurements, quotes) and save it for when your memory lets you down
• Swipe a line away, or wipe the whole slate

WITHIN ARM'S REACH
• Converter: type one number, see every unit at once. Star the ones you use
• Cooking: recipe for 4, dinner for 6? Change the servings, or match one ingredient, and the rest follows
• Sizes: shoes and clothes in US / UK / EU / cm, because sizes never agree
• Notebook by day, chalkboard by night. Switch anytime in Settings