General Calculators
Everyday calculators for age, percentages, dates, discounts and units.
Age Calculator
Calculate your exact age in years, months and days from your date of birth.
Percentage Calculator
Calculate percentages, percentage increase or decrease, and what percent one number is of another.
Date Calculator
Add or subtract days, weeks, months or years from a date.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days and total days.
Discount Calculator
Calculate sale price, discount amount and savings percentage.
Unit Converter
Convert common length, weight, temperature and area units quickly.
Everyday date, percentage and conversion calculators
Use quick tools for age, percentages, date arithmetic, date differences, discounts and unit conversions. Each calculator is designed to return the main answer first, with the formula or method explained below.
These calculators run directly in the browser and do not require an account, making them useful for fast everyday calculations on mobile or desktop.