Age Calculator
Enter your date of birth and find out your exact age in years, months and days, plus how long you have been in this world.
What is exact age used for?
Knowing your exact age goes beyond knowing how many years you are. There are many situations where you need to know the precise years, months and days:
🏥 Medical use
Many dosage calculations, vaccines and paediatric follow-ups require exact age in months, not just years.
⚖️ Legal matters
Contracts, inheritances, access to benefits and retirement may depend on exact age on a specific date.
🐾 Pets
The age of dogs and cats in months is key for their diet, vaccinations and veterinary care.
📚 Personal curiosity
Knowing exactly how many days you have been alive or how many weeks old you are is a surprising fact that few people know.
How is exact age calculated?
The calculation takes into account the actual length of each month and leap years. It is not as simple as subtracting the birth year from the current year, because you also need to consider whether the birthday has already passed in the current year.
| Unit | Approximate equivalent |
|---|---|
| 1 year | 365 days (366 in a leap year) |
| 1 month | 28 to 31 days depending on the month |
| 1 week | 7 days |
| 1 day | 24 hours = 1,440 minutes |
| 10 years | ≈ 3,652 days |
| 18 years | ≈ 6,574 days |
| 65 years | ≈ 23,741 days |
The days lived figure
Most people are surprised when they see how many days they have been alive. Someone aged 30 has lived more than 10,900 days. By the age of 18, you have already passed 6,500 days. This figure can be a motivating way to look at time differently.
Frequently asked questions about age calculation
How is exact age calculated?
It is calculated by subtracting the date of birth from the current date, taking into account the actual length of each month and leap years. The result is expressed in complete years, months and days elapsed.
Do leap years affect the calculation?
Yes. Leap years have 366 days instead of 365, which affects the total number of days lived. Our calculator accounts for them automatically.
Can I calculate the age of another person or a historical date?
Yes. The calculator accepts any date of birth. You can calculate the age of another person, a pet, or even the age of an object or historical event by changing the calculation date.
How many days are in a year on average?
A normal year has 365 days and a leap year has 366. Considering the leap year cycle, the average is 365.25 days per year.