Age Calculator
How old am I exactly — in years, months and days — and when is my next birthday?
Spec sheet
calendar_age · v1.0.0Calendar age (completed years, months, days)
- 01
years = completed birthdays - 02
months, days = remainder after the last monthly anniversary - 03
Feb 29 birthdays fall on Feb 28 in common years
- Calendar age; time of birth and time zones are ignored.
- ISO 8601 calendar datesstandard
Worked example
computed by the same formulaBorn 1990-05-15
- Date of birth
- 1990-05-15
- Age on
- 2026-11-01
- Age (years)
- 36
- Exact age
- 36 years, 5 months, 17 days
- Days lived
- 13,319
- Days to next birthday
- 195
Questions
How is the age calculated?
›
Calendar age (completed years, months, days). years = completed birthdays · months, days = remainder after the last monthly anniversary · Feb 29 birthdays fall on Feb 28 in common years
Example: Born 1990-05-15?
›
Age (years): 36; exact age: 36 years, 5 months, 17 days.
What does this calculator not cover?
›
Calendar age; time of birth and time zones are ignored.
Where do the numbers come from?
›
Sources: ISO 8601 calendar dates. The formula is versioned (calendar_age v1.0.0) and covered by automated tests.
Is my data stored?
›
No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.
Also searched asage calculator · how old am i · calculate age from date of birth · exact age in days · days until my birthday