Everyday Calculators
Some math questions come up again and again: what's 20% off this price, how much should we each chip in for dinner, how old is someone born in 1987, exactly? These everyday calculators answer the small-but-frequent questions in a couple of taps.
Each one is built to be faster than opening your phone's calculator app and doing the arithmetic yourself — with the formula spelled out underneath, so you can learn the mental-math shortcut for next time.
Percentage CalculatorPercent of a number, percent change, and everything in between.Open calculatorTip CalculatorFigure the tip and split the check — no awkward table math.Open calculatorDiscount CalculatorThe real price after the discount — and what you saved.Open calculatorAge CalculatorYour exact age — down to the day — plus a birthday countdown.Open calculator