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Puspa Chaulagai
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Age Difference Calculator

Compare two people's ages and find the exact gap in years, months, and days. Label as father, mother, sister, brother, or any custom names — supports BS and AD birth dates.

Age difference

25 years

4 months, 30 days

Fatheris 25 years older than Son
Father's age
53y 1m 13d
Son's age
27y 8m 14d
Gap in total days
9,283 days
Father born (AD)
April 27, 1973
Father born (BS)
बैशाख 15, 2030 BS (Baisakh)
Son born (AD)
September 26, 1998
Son born (BS)
असोज 10, 2055 BS (Ashwin)

Find the exact age gap between any two people — father and son, brother and sister, husband and wife, or any custom labels. Enter birth dates in Bikram Sambat (BS) or Gregorian (AD)and see who is older, by how much, and each person's current age.

Relationship labels

Father, mother, sister, brother, husband, wife — or fully custom names.

BS & AD dates

Enter birth dates in Bikram Sambat or Gregorian for each person independently.

Exact gap

Years, months, and days — not just a rounded year count.

Private & free

All calculations run locally in your browser. No signup required.

How to Use the Age Difference Calculator

  1. 1

    Pick relationship labels

    Choose Father / Mother, Brother / Sister, Person 1 / Person 2, or enter custom names.

  2. 2

    Enter both birth dates

    Each person can use BS or AD — mix calendars if your documents differ.

  3. 3

    See the age gap

    Get the exact difference in years, months, and days, plus who is older.

  4. 4

    View individual ages

    Both people's current ages and birth dates in BS and AD are shown together.

About Age Difference Calculation

Whether you want to know how many years separate a father and son, compare brother and sister ages, or check the gap between any two friends, this calculator gives a precise breakdown — not just rounded years.

In Nepal, birth dates are often recorded in Bikram Sambat (BS) on official documents, while international forms use Gregorian (AD) dates. This tool lets each person use whichever calendar their birth certificate shows, then computes the difference accurately.

Related Tools

Calculate a single person's age with our Nepali Age Calculator, or convert dates with the Nepali Date Converter (BS ⇄ AD).

Frequently Asked Questions

How is age difference calculated?

Both birth dates are converted to Gregorian (AD) dates internally. The calculator then finds the exact gap in years, months, and days between the older and younger person as of today.

Can I compare a BS birth date with an AD birth date?

Yes. Set each person's calendar independently — one can be BS and the other AD. The tool handles conversion automatically.

What if both people were born on the same day?

The age difference will show 0 years, 0 months, and 0 days, with a note that both share the same birth date.

Can I use this for father–son or brother–sister age gaps?

Yes. Select a relationship preset from the dropdown and the labels update automatically. You can also type custom names.

Is this tool free?

Yes — 100% free with no account required. Everything runs in your browser.

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