Date & Time Calculators

Calendar math is deceptively tricky — months have four different lengths, leap years interfere, and time is base-60. These tools get it exactly right: your age to the day, the precise gap between two dates, deadlines like "90 days from today", clock-time arithmetic, and hours worked with breaks deducted. Every calculation handles leap years and month lengths properly.

Age Calculator
Calculate your exact age in years, months, and days from your date of birth — plus total weeks, days, hours, and a countdown to your next birthday.
Date Calculator
Count the exact days, weeks, months, and years between two dates, or add and subtract days from any date to find a deadline.
Time Calculator
Add or subtract times in hours, minutes, and seconds without base-60 headaches.
Hours Calculator
Calculate hours worked between a start and end time, minus breaks — including overnight shifts.