What is the Chronological Age Calculator?

The Chronological Age Calculator is an online tool that computes your precise age in years, months, days, hours and minutes. It also provides decimal years and total days lived, plus an optional corrected age for pre-term births.

Do I have to enter the time of birth?

No, entering the time of birth is optional. If left blank, the calculator assumes 00:00 (midnight) and computes the age accordingly, but if you enter the time then the age result is adjusted precisely to the minute.

What is 'corrected age' and when should I use it?

Corrected age (or adjusted age) is used for infants born pre-term. It adjusts the chronological age by the number of weeks the baby was born early, up to about 24 months of age. Check the ‘Include Corrected Age’ box and enter gestational weeks or weeks early to use this feature.

How accurate is the calculator?

The calculator uses the browser’s date/time functions and your inputs to compute age to the minute. While highly accurate for general use, results are estimates only and not a substitute for medical or legal certified age verification.

Can I calculate age for a future date?

Yes. If you enter a reference date and time that is in the future relative to your date of birth, the tool will calculate how old you will be at that future moment. Ensure the reference date/time is after your date of birth.

Chronological Age Calculator – Find Your Exact and Corrected Age in Years, Months & Days

The Chronological Age Calculator helps you instantly determine your exact age in years, months, days, and even minutes. It works entirely within your browser, so your data always stays private. Moreover, this smart calculator is simple to use and ideal for a variety of everyday and professional purposes.

What is Chronological Age?
Chronological age is the actual amount of time that has passed since your date of birth. You can measure it in years, months, and days to know how long you have lived. For instance, schools use chronological age to decide student eligibility, while doctors rely on it for developmental assessments. Additionally, when babies are born prematurely, corrected age helps compare their development with full-term infants. In short, understanding your true age provides useful context for health, education, and life milestones.

Precision Output

You can view your age in years, months, days, total days, weeks, and even exact minutes — all calculated instantly.

Corrected Age

If you enter gestational weeks, the calculator adjusts for premature birth to show developmentally accurate age.

Private & Fast

All processing happens locally on your device. As a result, your inputs never leave your browser, ensuring complete privacy and speed.

Browse More Free Calculators

How to use: First, choose your Date of Birth. Next, adjust the reference date if needed (it defaults to today). Then, check the “Corrected Age” option if applicable and add gestational weeks. Finally, click Calculate to view your exact age from years down to minutes.

Chronological Age Calculator

Calculate your exact age in years, months, days, hours, and minutes — with optional corrected age for preterm birth.

Date of Birth

Time of Birth (optional)

Calculate age on (optional)

Reference Time (optional)

Include Corrected Age (for preterm)

Gestational Age at Birth (weeks)

Weeks Early (optional)

Enter details and click Calculate Age.

Years

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Months

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Days

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Hours

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Minutes

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Why this tool is useful

After running the calculator you’ll get a clear, copyable result showing the precise time elapsed. For clinicians and parents, the corrected (adjusted) age is essential when evaluating developmental milestones for preterm infants — this calculator implements the standard clinical adjustment (subtract weeks early from chronological age using a 40-week baseline).

What is chronological age?

Chronological age is the exact time elapsed from birth to a chosen reference date, usually expressed in years, months, and days.

What is corrected (adjusted) age?

Corrected age compensates for prematurity. If a baby is born before 40 weeks, corrected age = chronological age − (40 − gestational_weeks). It’s commonly used up to ~24 months.

Is this calculator medically authoritative?

This tool performs standard calendar calculations and clinical adjustments commonly used by pediatricians and speech therapists. It is for informational use — consult a clinician for medical decisions.

Related calculators
All Free Calculators — Ultimate Info Guide

Authoritative guidance
CDC — Child Development & Healthcare

Tip: Use the corrected age option for preterm infants when assessing milestones; the calculator shows both chronological and corrected ages so you can compare side-by-side.