Why we built it
Most age calculators online get the basics right but cut corners on the details: timezone handling, 29 February birthdays, the difference between Chinese, Korean and international age. We built DOBcalc to do all of it properly — and to show you exactly which date and convention every number was computed against.
The result card is designed to be read, not just generated: your exact age, the total days you have been alive, your next birthday, and a few genuinely fun facts like the weekday you were born on and how many full moons you have lived through.
How it works
Every calculation runs locally in your browser using the same calendar math that registries use: complete years, then complete months, then days — with real calendar month lengths, not approximations. Nothing you enter is ever sent to a server.
DOBcalc is funded by unobtrusive advertising. There are no accounts, no paywalls and no limits on how many dates you can check.
The tool family
The core date-of-birth calculator anchors the family, joined by the age calculator, birthday calculator and countdown, day-in-units counters, Chinese and Korean age calculators, the age difference tool, the reverse birth-year finder and the milestone age calculator — 14 tools in total, all free.