Math Calculators

Percentage, ratio, fraction calculators

Calculate percentages easily. Find percentage of a number, percentage change, percentage difference, and more. Free online percentage calculator.

Calculate your exact age in years, months, and days. Also shows total months, weeks, days, and days until next birthday.

Calculate discount amount, final price after discount, and how much you save. Works with any percentage off.

Calculate tip amount, total bill, and split between multiple people. Quick preset buttons for common tip percentages.

Calculate your GPA from course grades and credit hours. Supports standard US 4.0 scale with plus/minus grades.