Calculators

Quick answers with the working shown — honest math, no dark patterns.

Three percentage calculators in one: X% of Y, X is what percent of Y, and percent increase/decrease between two numbers.

Work out the tip and total, and split the bill between any number of people.

Enter a price and a percent off to get the sale price and the amount saved.

Count the days, weeks, months, and years between any two dates.

Calculate exact age from a date of birth: years, months, days, plus total days lived and next-birthday countdown.

Project savings growth with compound interest and optional monthly contributions.