Age calculator
Your exact age is the time elapsed from your date of birth to right now, counted in years, months, and days. Enter your birthday below to see it down to the live ticking second, plus your age in weeks, hours, and dog years.
Suppose the birth date is 15 March 1990 and the check happens on 1 July 2026. Complete years come first: the 36th birthday passed on 15 March 2026, so years is 36. Complete months come next: 15 April, 15 May, and 15 June have each gone by, so months is 3. The leftover span runs from 15 June to 1 July, which is 16 days. The calendar answer reads 36 years, 3 months, 16 days.
The raw totals tell the same story in bigger units. Those 36 calendar years contain nine leap days (1992 through 2024), giving 13,149 days up to the last birthday, plus 108 more days to reach 1 July, for 13,257 days in total. Divide by seven and you get 1,893 full weeks and 6 days; multiply by 24 and you get 318,168 hours. On the dog years tab the same lifespan converts to 195 dog years on the AKC progressive formula, against 254 on the retired times seven rule.
The breakdown always resolves in that order. The calculator finds your most recent birthday anniversary, counts the complete months that have passed since it, and only then counts leftover days. Reversing the order would give a different answer because months vary in length: a 31 day stretch is a full month if it starts on 1 March but falls a day short if it starts on 1 April. Sticking to one fixed order keeps the result stable from day to day and matches the convention used on forms that ask for age in years and completed months.
The standard "years, months, days" breakdown is the one most people grew up with, but it hides what is actually a more interesting story. Total days is the cleanest measure of how long you have been alive. Total weeks lines up with the way we plan work and travel. Total hours and minutes get you closer to a sense of just how much accumulated time you already have on the clock. Seconds is the one that surprises everyone the first time they see it tick: a person in their thirties has already counted more than a billion of them. Knowing both the calendar breakdown and the raw totals is useful for things like insurance forms, legal cutoffs, school year placement, and any anniversary planning.
The "multiply your dog's age by seven" rule was always a rough approximation, and modern veterinary research has retired it. The American Kennel Club's progressive method counts the first year of a dog's life as roughly fifteen human years, the second year as nine more, and every year after that as five. That fits much better with how dogs actually mature and senesce. We show both the AKC progressive number and the old ×7 estimate so you can compare them. Breed size matters too: small breeds typically live longer per dog-year than large breeds, so adjust mentally if your companion is a Chihuahua or a Great Dane.
Sometimes you need it for an immigration form. Sometimes you want to know exactly how many days are left until your fortieth birthday so you can plan the trip. Sometimes you are curious how old a relative would have been today. Sometimes you are just bored at work and want to see your seconds tick up. All of these are good reasons. If you need the gap between two arbitrary dates instead, try the days-between tool. If you want to know what time it is right now in another city, try the world clock.
Calendar age has one genuine ambiguity: when the current day number is smaller than your birth day number, the tool has to borrow days from a month, and different tools borrow from different months. This calculator counts complete years, then complete months, then leftover days, so the months and days parts can differ from other sites by a day or two. The total days figure is unambiguous and should match everywhere.
In leap years the anniversary lands on the real 29 February. In common years that date does not exist, so the completed year registers around the end of February and the counters keep running from the last real anniversary. Totals in days, hours, and seconds are unaffected because they never depend on an anniversary date.
The birth date is read as midnight in your device's local time zone and compared against your device clock, so the breakdown matches your local calendar. Checking the same birthday from another time zone can shift when the days figure rolls over by a few hours, but never by more than a day.
One billion seconds is about 11,574 days, or roughly 31.7 years, so most people cross the milestone a few months before their 32nd birthday. Two billion seconds arrives at about 63.4 years.
The weeks card counts only complete seven day weeks and drops the remainder. Someone who has lived 10,000 days sees 1,428 weeks, because 10,000 divided by 7 is 1,428 full weeks with four days left over.