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Everyday Calculators

Age, tip, unit conversion, and daily tools

Calculate your exact age in years, months, and days, and find out when your next birthday is.

Calculate tip amount, total bill, and split evenly between any number of people.

Convert between units of length, weight, temperature, volume, and speed instantly.

Add or subtract time durations, or calculate elapsed time between two clock times.

Estimate concrete volume in cubic yards and number of bags needed for slabs, footings, or columns.

Calculate network address, broadcast address, usable hosts, and subnet mask from an IP and CIDR.

Find the exact difference between two dates in years, months, days, and business days.

Track work hours and calculate total time worked with optional earnings.

Calculate your weighted GPA from course grades and credit hours.

Calculate your weighted grade and letter grade across all assignments.

Generate strong, random passwords with custom length and character sets.