How do I calculate my exact age from date of birth?

Enter your birth date (day, month, year) and the calculator determines your exact age in years, months, and days. It accounts for varying month lengths and leap years for precise results. Your age updates automatically based on today's date.

How old am I today based on my birthday?

Enter your birthday in the calculator to instantly see your current age. Results show your age in years, months, days, weeks, and total hours lived. The calculator uses today's date by default for accurate current age.

How do I calculate age difference between two people?

Enter both birth dates and the calculator shows the exact age difference in years, months, and days. This is useful for couples, siblings, or any age gap comparison. The age gap calculator accounts for all date variations.

How many days old am I?

The calculator shows your age in total days lived since birth. It counts every day including leap years. For example, someone born 30 years ago has lived approximately 10,950 days (30 × 365 + leap days).

How old will I be on a future date?

Enter your birth date and change the target date to any future date. The calculator shows your exact age on that date. Perfect for planning milestone birthdays or checking age requirements for future events.

How does the calculator handle leap years?

Our age calculator correctly accounts for leap years (years divisible by 4, except century years not divisible by 400). February 29 birthdays are handled properly, and total days include all leap days in your lifetime.

What is chronological age vs biological age?

Chronological age is your actual age based on birth date — what this calculator measures. Biological age reflects how old your body seems based on health markers. You can be chronologically 50 but biologically 40 with good lifestyle habits.

How do I calculate age manually step by step?

1) Find years: subtract birth year from current year. 2) Adjust for birthday: if birthday hasn't occurred this year, subtract 1 year. 3) Calculate months: count months from last birthday. 4) Calculate days: count remaining days. Our calculator does this automatically.

How many days until my next birthday?

Enter your birth date and the calculator shows the countdown to your next birthday in days. It also shows the day of the week your birthday falls on this year. Great for birthday planning and countdowns.

How do I calculate time between two dates?

Enter any two dates (not just birth dates) to find the duration between them in years, months, days, weeks, and hours. Useful for calculating project durations, relationship anniversaries, or time since any event. For pure date arithmetic without age framing, use the Date Calculator.

What is the legal age of majority in the US, UK, Canada and Australia?

US: 18 in most states (Alabama and Nebraska 19, Mississippi 21). UK: 18 (England, Wales, Scotland, Northern Ireland). Canada: 18 in Alberta, Manitoba, Ontario, Quebec, Saskatchewan, PEI — 19 in BC, New Brunswick, Newfoundland, Nova Scotia, NWT, Nunavut, Yukon. Australia: 18 nationwide. These thresholds affect contracts, voting, and independent legal rights. Alcohol, gambling and driving ages may differ — see specific thresholds below.

What are voting, drinking, and driving ages across the four English-speaking markets?

US: vote 18, drink 21 (federal), drive learner 15-16 varies by state. UK: vote 18 (Scotland 16 for Scottish parliament), drink 18 (buy alcohol), drive 17 (provisional). Canada: vote 18, drink 18 in Alberta/Manitoba/Quebec and 19 elsewhere, drive learner 14-16 varies by province. Australia: vote 18, drink 18, drive learner 16 in most states. Rules differ within countries too — always verify with local state/province authorities.

What is the retirement age in the US, UK, Canada and Australia?

US: Social Security full retirement age is 67 for anyone born 1960+; reduced benefits available from 62. UK: State Pension age is 66, rising to 67 between 2026-2028 and 68 from 2044-2046. Canada: CPP/QPP basic retirement age is 65; can take reduced from 60 or delay to 70 for higher payments. OAS starts at 65. Australia: Age Pension qualifying age is 67 for anyone born July 1957 or later. Super access age is 60. All four markets allow earlier claims at reduced rates — use retirement calculators for specifics.

How old is my dog or cat in human years?

The old '1 dog year = 7 human years' rule is oversimplified. Small dogs: year 1 ≈ 15 human, year 2 ≈ 24, then +4-5 per year. Large dogs age faster. A 2024 scientific study (Cell Systems) proposed: human_age ≈ 16 × ln(dog_age) + 31 for dogs. Cats: year 1 ≈ 15 human, year 2 ≈ 24, then +4 per year, so a 10-year-old cat is ~56 in human terms. For precise conversion, dedicated pet-age tools use breed size. Our age calculator gives exact dog/cat ages in years and days; multiply by the appropriate factor for human-equivalent estimate.

How do different cultures count age differently?

Most of the world uses chronological age: you turn 1 on your first birthday. Traditional Korean age counted you as 1 at birth and added 1 every Lunar New Year — so a baby born December 31 was '2' on January 1. Korea officially switched to international age in 2023 but some contexts (drinking age domestically) still use 'year age' (current year − birth year). Chinese nominal age is similar to traditional Korean. Our calculator uses the international standard — completed years since birth.

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Age Calculator

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cake Date of Birth

event Calculate Age On (default: today)

celebration

Next Birthday

286 days away

January 15, 2027

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Capricorn

Zodiac Sign

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Millennial

Generation

Your Exact Age

Years

Months

Days

Total Days

13,230

Total Weeks

1,890

Total Months

434

Total Hours

317,520

Born on Monday

This year's birthday Wednesday

lightbulb Tips

•Enter any date format (YYYY-MM-DD)
•Leap year babies: Feb 29 handled
•Change target date for future age
•1 year ≈ 365.25 days on average

emoji_events Age Milestones

1,000 days 2 yrs 9 mo

5,000 days 13 yrs 8 mo

10,000 days 27 yrs 5 mo

1 billion sec 31 yrs 8 mo

20,000 days 54 yrs 9 mo