Age Difference Calculator
Enter two dates of birth to see exactly how far apart two people are in age, in years, months and days, and in total days and weeks.
Age difference
4 years, 7 months, 19 days
- In days
- 1,694
- In weeks
- 242
- In years (decimal)
- 4.64
The older person was born 4 years, 7 months and 19 days earlier (1,694 days).
How it's worked out
- Older to younger
14 March 1990 to 2 November 19941,694 days
Example
Someone born on 14 March 1990 is 4 years, 7 months and 19 days older than someone born on 2 November 1994.
The gap is also given in total days and weeks, which stays the same however old the two people become.
Questions people ask
How do I work out an age gap?
Count whole years from the earlier birthday, then whole months, then the days left over. The calculator does it for you, including leap years.
Does it matter which date I enter first?
No. It finds the older person and measures the gap from their birth date.
Can I use it for siblings or couples?
Yes, for anyone: siblings, couples, parents and children, or even two historical figures.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem