Age Calculator

Calculate your exact age in years, months, and days from your date of birth. Free, instant, no signup.

Date of birth

How to use the Age Calculator

Enter your values. Fill in the fields with your numbers.
Calculate. Press Calculate to run the age calculator.
Use the result. Copy the result or try a related tool next.

Why use our Age Calculator

Instant results. Enter your figures and the age calculator returns an answer in seconds.

Free & private. Runs in your browser — no signup, and nothing is sent to a server.

Accurate. Uses standard formulas so you can rely on the numbers.

Free to use — premium coming soon

FREE

✓ Unlimited calculations
✓ Instant results
✓ No signup

PREMIUM

★ Remove ads
★ Save & compare scenarios
★ Export results

About the Age Calculator

The Age Calculator tells you exactly how old you are from a date of birth to any reference date, broken down into years, months, and days rather than a single rounded number. Type in your birthday and, optionally, an "age at" date other than today, and the tool returns your full age the way most people actually think about it: a count of completed years, then the leftover months, then the leftover days. It follows the standard Western convention, where your age ticks up on your birthday and stays put the rest of the year, so a person who has lived three years and eleven months is still three until that next birthday arrives.

Reach for this calculator whenever a precise figure matters more than a rough guess. It is handy for filling in forms that ask for an exact age, working out how many days until a milestone birthday, settling debates about who is older down to the day, or checking eligibility against an age threshold for school enrolment, a driving licence, a pension, or a senior discount. Parents use it to track an infant's age in months, HR and admissions staff use it to confirm cut-off dates, and anyone planning an anniversary or countdown can use it to know precisely how much time has passed or remains.

Under the hood the tool compares two calendar dates hierarchically instead of just dividing total days by 365. It first counts the complete years that have elapsed, then the whole months remaining, then the leftover days, borrowing from the previous month's true length when the day-of-month would otherwise go negative. That is why it respects the fact that months have 28 to 31 days and why leap years are handled automatically: the actual calendar is used, not an average. If you were born on 31 January and it is 1 March, the result is one month and a couple of days, not two months, because only completed months are counted.

Accuracy depends on the calendar you give it, and the calculator works entirely in your browser. Nothing you enter is uploaded, stored, or shared, so your date of birth stays on your own device. Keep in mind that the month-and-day breakdown can look slightly ambiguous when the start date falls at the very end of a month, since there is more than one defensible way to span an uneven month; this tool counts whole calendar months first and adds the remaining days, which is the most widely used convention. For leap-day births, the age increases every year as normal, with 28 February or 1 March commonly used as the observed birthday in non-leap years.

Frequently asked questions

How is my exact age calculated in years, months, and days?

The calculator subtracts your date of birth from the reference date one unit at a time: it counts complete years first, then the whole months left over, then the remaining days. It uses the real calendar, so months of different lengths and leap years are accounted for automatically.

Can I calculate my age on a future or past date instead of today?

Yes. By default it uses today's date, but you can enter any "age at" date to find out how old you were, or will be, on that specific day. This is useful for forms, eligibility cut-offs, and milestone planning.

How does the calculator handle a 29 February (leap day) birthday?

It treats leap-day births like any other: your age goes up by one each year based on time lived, not on how often 29 February appears. In non-leap years the birthday is commonly observed on 28 February or 1 March, but the underlying age count is unaffected.

Why does the months-and-days result sometimes look off by a day?

When your birth date is at the end of a month, there is more than one valid way to count an uneven month. This tool counts full calendar months first and then adds the leftover days, which is the most common method, so results may differ slightly from a calculator that uses another rule.

Is my date of birth kept private?

Yes. The calculation runs entirely in your browser, so your date of birth is never uploaded or stored on a server. You can use the tool without creating an account or leaving any personal data behind.

From our blog

How to Set a Daily Carb Target You Will Actually Stick To

By the Super Simple Digital Tools Team · Updated June 2026

Carbohydrates are your body's most accessible fuel, but 'eat more carbs' or 'cut the carbs' means nothing without a number. The point of a carbohydrate calculator is to translate broad advice into a single figure in grams that you can plan meals around. Getting there takes three layers: how many calories you burn in a day, how much of that energy should come from carbs, and how to convert calories into grams. Once you understand those layers, the calculator stops being a black box and becomes a tool you can adjust with confidence.

The foundation is your Total Daily Energy Expenditure. The calculator first estimates your Basal Metabolic Rate, the energy you would burn at complete rest, using the Mifflin-St Jeor equation that takes your weight, height, age, and sex. It then multiplies that by an activity factor, which is why honestly picking 'sedentary' versus 'very active' matters so much. Overstating your activity inflates your calorie estimate and, in turn, your carb target. If you sit most of the day but train three times a week, choose a moderate level rather than the highest one.

Next comes the percentage split. The Acceptable Macronutrient Distribution Range allows anywhere from 45 to 65 percent of calories from carbohydrate, and where you land inside that band reflects your goal. Endurance athletes and people doing high-volume training tend toward the upper end to keep glycogen topped up. Those aiming for fat loss or following a lower-carb approach drift toward the lower end, shifting some calories to protein to protect muscle. There is no single correct figure inside the range, which is exactly why the calculator lets you set it.

The final step is simple arithmetic that is easy to do yourself as a sanity check. Multiply your daily calories by your chosen carb percentage to get carb calories, then divide by 4, because a gram of carbohydrate yields 4 calories. A 2,500-calorie day at 50 percent gives 1,250 carb calories, or about 313 grams. Run the same maths at 40 percent and you get 250 grams. Seeing how much one slider moves the result is the fastest way to understand the trade-offs you are making.

Finally, treat your number as a hypothesis to test, not a verdict. Eat to the target for two or three weeks while tracking your weight, energy, and training quality, then adjust. If workouts feel flat, nudge carbs up; if fat loss has stalled, trim them down and watch protein stays high. The calculator gives you a defensible starting point grounded in real nutrition science, and your own results tell you where to go from there.

Pick your activity level honestly; jumping one tier higher than your real lifestyle can add hundreds of carb calories you do not burn.
Use 4 calories per gram to spot-check the result, and remember alcohol and fat do not follow the same conversion (fat is 9 calories per gram).
Stay at or above the 130 gram daily minimum for adults unless a clinician has set you a specific lower-carb plan.
Re-run the calculator after a noticeable weight change, since both your BMR and your gram target shift as your body weight does.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.