Age Difference Calculator (Between Two Birthdays)
Enter both dates of birth.
Your numbers
Your results
Age difference
Age difference
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Total days
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In years (decimal)
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Older person
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Age Difference Calculator (Between Two Birthdays) by TheCalcTools
How the Age Difference Calculator (Between Two Birthdays) works
The difference is counted on the calendar: whole years, then whole months, then the remaining days, borrowing days from the previous month when needed.
Total days is the exact count between the two dates; decimal years divides by 365.25.
The formula
Calendar difference: years, months and days between the two dates
Worked example
Using the default values shown in the calculator:
| First person's date of birth | 1990-03-15 |
|---|---|
| Second person's date of birth | 1994-11-02 |
- 15 March 1990 and 2 November 1994 are 4 years, 7 months, 18 days apart (1,693 days).
Result:
| Age difference | 4 years, 7 months, 18 days |
|---|---|
| Total days | 1,693 |
| In years (decimal) | 4.64 |
| Older person | First person |
Frequently asked questions
Does the order of the dates matter?
No. The calculator always measures from the earlier date to the later one.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.