Every date calculator in one place
Eight focused calculators plus three flagship tools — every one is free, instant, and runs entirely in your browser.
Calculators & estimators
Pregnancy Due Date Calculator
Estimate your baby's due date and track every week of pregnancy from your last menstrual period.
Open tool →Conception Date Calculator
Work backward from a due date or birth date to estimate the most likely conception window.
Open tool →Ovulation & Fertile Window Calculator
Predict your most fertile days and ovulation date for the next three cycles.
Open tool →Age Calculator
Calculate exact age in years, months, days, weeks, hours and seconds — plus next birthday.
Open tool →Date Difference Calculator
Find the exact gap between two dates in years, months, weeks and days.
Open tool →Date Add / Subtract Calculator
Add or subtract days, weeks, months or years from any date instantly.
Open tool →Working Days Calculator
Count business days (Mon–Fri) between two dates, ideal for project planning and contracts.
Open tool →Live Countdown Timer
A live countdown to any future date — wedding, exam, holiday, launch — updates every second.
Open tool →Innovative tools
Multi-Calendar Converter Unique
Convert any date across Gregorian, Hijri (Islamic), Hebrew, Persian, Buddhist, Indian and more.
Open tool →Date Memory Vault Unique
Privately save important dates in your browser and see live countdowns whenever you visit.
Open tool →Pregnancy Week-by-Week Journey Unique
An interactive timeline of fetal development from week 1 through week 40.
Open tool →