Age Calculator
Calculate your exact age in years, months and days from a date of birth.
About Age Calculator
The exact age counts completed years first, then the leftover months and days since the most recent birthday, correctly handling shorter months like February. Knowing the precise split between years, months and days matters for school enrollment, contracts and milestone planning.
Formula
Age
Age = years between birth and today = (current - birth) adjusted for whether the birthday has passed yet; remainder days fall out of the partial month
- birthday
- Annual date based on birth month and day
Worked example
With the default values below, Age Calculator returns Age in Years of 35. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Birth year
- 1,990
- Birth monthaccepts 1–12
- 5
- Birth dayaccepts 1–31
- 15
- Current year
- 2,025
- Current monthaccepts 1–12
- 8
- Current dayaccepts 1–31
- 1
Results
- Age in Years
- 35
- Remaining Months
- 2
- Remaining Days
- 17
Step by step
- 1Values used
- 2Age
- 3Age in Years= 35
- 4Remaining Months= 2
- 5Remaining Days= 17
Assumptions and limits
- The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Age calculated?
Age = years between birth and today = (current - birth) adjusted for whether the birthday has passed yet; remainder days fall out of the partial month The exact age counts completed years first, then the leftover months and days since the most recent birthday, correctly handling shorter months like February.
Why does Age matter?
Knowing the precise split between years, months and days matters for school enrollment, contracts and milestone planning.
What values do I need to enter?
This calculator takes 6 inputs: Birth year, Birth month, Birth day, Current year, Current month, Current day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.