Java-Scripts.net

Exact Age Calculator

Stop counting on your fingers. Enter a birthdate below to find out exactly how old you are today.

You are old.

Copy the Script

<script>
function calculateAge(birthDateString) {
    var today = new Date();
    var birthDate = new Date(birthDateString);
    
    var age = today.getFullYear() - birthDate.getFullYear();
    var m = today.getMonth() - birthDate.getMonth();
    
    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    return age;
}
// Usage: calculateAge("1990-01-01");
</script>

Frequently Asked Questions

Yes. The JavaScript `Date` object accounts for leap years when calculating differences between years.

Yes. Once you have the difference in milliseconds, you can divide by `1000 * 60` to get total minutes alive.

No. All calculations happen instantly in the user's browser. No personal birthdate data is stored or transmitted.