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Utility Calculators

Age Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

Age (years)

36

Total days
13,314
Total months
437
Total weeks
1,902

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Age Calculator

The Age Calculator works out your age (years), along with 3 related figures in an instant. Enter date of birth and age as on and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Pick the date of birth.
  2. Pick the age as on.
  3. Read off your age (years), together with total days, total months and total weeks — the calculator updates automatically, with no button to press.

Worked example

For example, with date of birth of 1990-01-01 and age as on of 2026-06-15, the age (years) is 36.

Inputs used
Date of birth 1990-01-01
Age as on 2026-06-15
Results
Total days 13,314
Age (years) 36
Total months 437
Total weeks 1,902

Results are estimates for educational use, not professional advice.

Frequently asked questions

It counts the number of days between your date of birth and the chosen reference date, then converts that into completed years, and the equivalent total months, weeks and days.

Age in years is the total days divided by 365.25 (which accounts for leap years) and rounded down to completed years. The reference date defaults to today but can be changed.

365.25 is the average year length including leap years, which keeps the completed-years count accurate over long periods. Total days is exact; the breakdown uses average month and year lengths.

Yes. Set 'Age as on' to any date to find your age on that day — useful for eligibility dates, anniversaries or planning. The start date must be earlier than the reference date.

Pick the date of birth. Pick the age as on. Read off your age (years), together with total days, total months and total weeks — the calculator updates automatically, with no button to press.

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