Work & Time

Age calculator

You enter your date of birth and key date. The calculator shows the exact age and the entire time period.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

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Calculator

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Calculation path

Step by step

  1. birth date

    Result: Jun 14, 1990

  2. deadline

    Result: Apr 23, 2026

  3. Determine age

    Formula: Calendar difference between both dates

    Result: 35 Jahre, 10 Monate, 9 Tage

  4. Total duration in days

    Result: 13,097 Tage

Instructions

How to use this calculator correctly

Input

  • Enter the date of birth and the desired deadline.

Read the result

  • The calculator displays the age in years, months and days.
  • You will also see the total duration in days.

Use cases

  • Helpful for applications, anniversaries, deadlines or simply for quick orientation.

Related guide: Working time, hours and industrial minutes in everyday life

Examples

Typical calculations

Born on June 14, 1990.

Adult person

Old: 35 years, 10 months, 7 days

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Born on November 3rd, 2018.

child

Old: 7 years, 5 months, 18 days

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Deadline exactly on birthday.

Round birthday

Old: 40 years, 0 months, 0 days

Load this example

FAQ

Frequently asked questions

Does the calculator take leap years into account?

Yes. The calendar difference takes real months and leap years into account.

Can I also enter a future date?

No. The key date must be on or after the date of birth.

Why does the calculator show years, months and days?

This makes the age more accurate and easier to understand than just using decimal values.

Is this suitable for authorities?

For deadlines and legal questions, the respective official date always counts.

Can I also use this for anniversaries?

Yes. The calculator is also suitable for round birthdays and anniversary dates.

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Sources and notes

Rule status and context

Calculation
Calendar-exact difference between date of birth and key date.