Age Calculator
Calculate your exact age, total days old, time until your next birthday, or the number of days between two dates.
Background
“Exact age” here means calendar-accurate years, months, and days. The calculator also gives a clear days-only answer for users who just want to know how many days old they are.
How to use this calculator
- Choose My age / days old or Days between dates.
- Enter the needed date or dates.
- Click Calculate to get exact age, total days, and supporting breakdowns.
How this calculator works
- Computes calendar-accurate years, then months, then days.
- Uses date-only math to avoid timezone issues.
- Shows a separate total days answer because many users want the days-only result.
- Handles leap years and variable month lengths.
Examples
Example 1 — Exact age today
If your date of birth is 2000-01-01 and you calculate your age today, the calculator returns your exact age in years, months, and days, plus total days lived.
Example 2 — How many days old am I?
Enter your birthday and select Today. The result card highlights your total days lived so you do not have to search through the breakdown.
Example 3 — Days between two dates
Switch to Days between dates, enter a start date and end date, and the calculator returns the exact number of calendar days.
Frequently Asked Questions
Q: What does “exact age” mean?
It means calendar-based years, months, and days (not approximate averages).
Q: Can this tell me how many days old I am?
Yes. Enter your date of birth and calculate age on today. The result shows total days lived as a main result card.
Q: Can I calculate the number of days between two dates?
Yes. Choose Days between dates and enter the start and end dates.
Q: What about Feb 29 birthdays?
You can choose how to handle them in non-leap years (default: Mar 1).
Q: Why might my result differ from another site?
Some tools approximate months as 30 days. This calculator uses real calendar months.
All calculators