Date & Time calculator
Age Calculator
Calculate age in years, months, and days from a date of birth.
Formula
Age calculation
Age = comparison date - date of birth, adjusted by calendar months and days
If birth date is 20 May 2000 and comparison date is 20 May 2026, the age is exactly 26 years.
FAQs
Does the age calculator include months and days?+
Yes. It shows a calendar-aware breakdown in years, months, and days.
Can I calculate age for a past date?+
Yes. Change the comparison date to calculate age on any selected date.
How does the Age Calculator calculate the result?+
It uses the Age calculation: Age = comparison date - date of birth, adjusted by calendar months and days. If birth date is 20 May 2000 and comparison date is 20 May 2026, the age is exactly 26 years.
What information do I need to use the Age Calculator?+
Calculate age in years, months, and days from a date of birth.
How accurate is the Age Calculator?+
Age Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Age Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Date & Time guide
How to use the Age Calculator
Calculate age in years, months, and days from a date of birth. The page also explains the age calculation and shows a practical example: If birth date is 20 May 2000 and comparison date is 20 May 2026, the age is exactly 26 years.
- 1
Enter your details
Enter a date of birth, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the age calculation: Age = comparison date - date of birth, adjusted by calendar months and days.
- 3
Compare scenarios
Change one or more inputs to see how they affect the age Calculator result before you use the estimate.
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