Age Calculator

Calculate your exact age from date of birth

Formula

Age = Target Date - Birth Date. Calculated precisely using date arithmetic accounting for varying month lengths and leap years.

Age calculation uses actual calendar dates, not average month lengths. This ensures accuracy for legal, medical, and personal use.

How to Calculate Manually

1
Enter your date of birth
2
Optionally enter a specific date to calculate age as of
3
Calculator computes difference precisely
4
Shows age in years, months, days, and more

Reference Table

Milestone	Approximate Age	Days
1 month	0 years 1 month	30
1 year	1 year	365
Sweet 16	16 years	5,844
18 (adult)	18 years	6,575
21 (US drinking)	21 years	7,670
Quarter century	25 years	9,131
30	30 years	10,957
50	50 years	18,262
Retirement (65)	65 years	23,741
Century	100 years	36,525

Age Calculator: Calculate Your Exact Age in Years, Months, Days

Knowing your exact age is important for legal documents, medical records, school enrollment, retirement planning, and personal milestones. While subtracting years seems simple, calculating exact age requires accounting for varying month lengths (28-31 days) and leap years (February 29)...

Frequently Asked Questions

How do I calculate my exact age? Subtract your birth date from today's date. This calculator does it precisely including leap years, giving you years, months, days, and even seconds.: Subtract your birth date from today's date. This calculator does it precisely including leap years, giving you years, months, days, and even seconds.
Does the calculator account for leap years? Yes, all calculations account for leap years (February 29) automatically for accurate results.: Yes, all calculations account for leap years (February 29) automatically for accurate results.
Can I calculate age for a future date? Yes, you can enter any 'as of' date to see how old you'll be on a specific future date.: Yes, you can enter any 'as of' date to see how old you'll be on a specific future date.

Calculator

Formula

Formula

How to Calculate Manually

Reference Table

Age Calculator: Calculate Your Exact Age in Years, Months, Days

Frequently Asked Questions

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