Calc and Measure
Simple calculators and unit converters, no sign-up needed.
Ten free tools for everyday math and unit conversion. Pick one below. Every tool runs right on this page, gives you a plain explanation of the formula it uses, and needs no account or download.
Everyday Calculators
Age Calculator
Find your exact age in years, months, and days from any birth date.
Days Between Dates Calculator
Count the days, weeks, months, or business days between two dates.
Percentage Calculator
Work out percentages, percentage change, and reverse percentages.
Tip Calculator
Calculate a tip and split the bill evenly between any number of people.
GPA Calculator
Work out your weighted grade point average from letter grades and credit hours.
Converters
Unit Converter
Convert length, weight, volume, and temperature between common units.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and foot length in centimeters.
Ring Size Converter
Convert ring sizes between US, UK, EU, and internal circumference.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, and international sizing.
Cooking Measurement Converter
Convert cups, tablespoons, and teaspoons of common ingredients to grams and ounces.