What is chronological age?

Chronological age is the exact amount of time that has elapsed since a person was born, measured in years, months, and days. It is the most common definition of age and is calculated by subtracting the birth date from the current date.

How do you calculate the age difference between two people?

Subtract the earlier birth date from the later birth date. For example, if Person A was born on March 5, 1990 and Person B on June 15, 1995, the age difference is 5 years, 3 months, and 10 days. Our calculator shows this breakdown automatically.

How many days old am I?

Multiply your age in years by 365, add the number of days in each additional month, and account for leap years (one extra day every 4 years). Our age calculator shows your total days lived automatically when you enter your birth date.

What day of the week was I born on?

You can calculate the day of the week for any date using Zeller's congruence formula, or simply enter your birth date into our age calculator — it shows the exact day of the week you were born.

How does the Chinese zodiac age work?

The Chinese zodiac runs on a 12-year cycle, each year represented by an animal (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig). Your sign is determined by your birth year. For example, 2024 is the Year of the Dragon.

How do you calculate age in months?

Multiply the number of full years by 12, then add the number of additional months. For example, someone who is 3 years and 7 months old is 3 × 12 + 7 = 43 months old. This is commonly used for infant and toddler development tracking.

How do I convert time between time zones online?

Enter your time in the input field, select your source time zone, and choose your destination zone — the converted time updates automatically. For scheduling meetings across multiple cities, use the World Clock & Scheduler which shows hourly time slots in up to 4 cities and lets you add the meeting to Google Calendar, Office 365, or Outlook directly.

How many kilometers are in a mile?

One mile equals exactly 1.609344 kilometers. To convert miles to kilometers, multiply the number of miles by 1.609344.

How do I convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply the temperature by 9/5 and add 32. For example, 100°C × 9/5 + 32 = 212°F.

How many pounds are in a kilogram?

One kilogram equals approximately 2.20462 pounds. To convert kilograms to pounds, multiply by 2.20462.

How many centimeters are in an inch?

One inch equals exactly 2.54 centimeters. This is a fixed conversion factor: to convert inches to cm, multiply by 2.54; to convert cm to inches, divide by 2.54.

How is BMI calculated?

BMI is calculated as weight in kilograms divided by height in metres squared (BMI = kg / m²). Categories: Underweight under 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese 30 and above.

What is compound interest and how do I calculate it?

Compound interest grows by earning interest on previously earned interest. The formula is A = P × (1 + r/n)^(n×t), where P is the principal, r is the annual rate, n is the compounding frequency, and t is the time in years. Use the Rule of 72 (72 ÷ rate%) to estimate doubling time.

Are exchange rates live and accurate?

Yes — currency rates come from the European Central Bank (ECB) via the Frankfurter API, updated daily. The historical chart shows 7, 30, or 90 days of rate movement for any supported currency pair.

Age Calculator — Exact Age by Date of Birth + Age Difference

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