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Age Calculator
Calculate exact age, zodiac sign, and days until next birthday
Calculate Age from Date of Birth
Knowing your exact age from your date of birth is important for personal, legal, and medical reasons. Whether you are filling forms, planning health checkups, or tracking milestones, calculating your age accurately matters. In this guide, we’ll show you how to calculate your age manually, with formulas, and using online age calculators, including gestational age for pregnancy tracking.
| Attribute | Details |
|---|---|
| Topic | Calculate Age from Date of Birth |
| Methods | Manual calculation, Formula, Online calculator |
| Tools | Excel, Google Sheets, Online apps |
| Additional | Gestational age calculation for pregnancy |
Why Knowing Your Exact Age Matters
How to Calculate Age from Date of Birth
Method 1: Manual Calculation
✔Note your birth date (day, month, year).
Example: Birthdate: 15 May 1995. Today’s date: 28 Dec 2025. Age = 30 years, 7 months, 13 days.
Method 2: Using Age Calculation Formula
Use this simple formula:
Age = Current Year – Birth Year Adjust for Month & Day
Example: If born on 15 May 1995 and today is 28 Dec 2025, check if your birthday has passed this year. It has, so Age = 2025 - 1995 = 30 years.
Method 3: Online Age Calculator Tools
Online calculators provide accurate age instantly. Simply enter your date of birth and get your age in years, months, and days.
Age Calculator by Year, Month, and Day
✅ Shows age in years, months, and days.
✅ Useful for legal documents and precise record-keeping.
Calculate Gestational Age
Gestational age is important in pregnancy and differs from chronological age. It is calculated from the first day of your last menstrual period (LMP).
Age Calculation in Excel or Google Sheets
To calculate age in Excel:
=DATEDIF(Birthdate, TODAY(), "Y")
This formula returns your age in years. To include months and days:
=DATEDIF(Birthdate, TODAY(), "Y") & " Years, " & DATEDIF(Birthdate, TODAY(), "YM") & " Months, " & DATEDIF(Birthdate, TODAY(), "MD") & " Days"
Common Mistakes to Avoid While Calculating Age
✅ Ignoring leap years.
✅ Forgetting to adjust for month/day.
✅ Using inaccurate calculators.
✅ Rounding off age incorrectly for legal or medical purposes.
Tools & Apps for Age Calculation
✅ Online age calculators (years, months, days).
✅ Mobile apps for age calculation.
✅ Features like age difference between two dates and future age prediction.
Conclusion
Calculating your age from your date of birth is simple if you follow these methods. Manual calculation, formulas, and online tools each have their uses. For precision and convenience, online calculators are recommended.
Frequently Asked Questions (FAQ)
Q1: How do I calculate my age from my date of birth?
A: Subtract your birth year from the current year, then adjust for your birth month and day. Online calculators provide precise results instantly.
Q2: What is the best formula to calculate age?
A: Age = Current Year – Birth Year. Adjust for month and day to get the exact age.
Q3: How can I calculate my age in months and days?
A: Use the DATEDIF function in Excel or Google Sheets, or an online calculator that shows exact years, months, and days.
Q4: What is gestational age and how is it calculated?
A: Gestational age is the age of pregnancy from the first day of the last menstrual period (LMP), usually measured in weeks and days.
Q5: Can I calculate age for any date in the past or future?
A: Yes, formulas and online tools allow age calculation for past and future dates.
Q6: Are online age calculators accurate?
A: Most are accurate as they account for leap years and month/day differences. Double-check for critical calculations.
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