Calculadora de Edad

Calculate exact age from birth date

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Acerca de esta herramienta

Age sounds like the simplest calculation there is, and it has more edge cases than almost any other date operation. The convention most of the world uses - your age increments on your birthday - is not universal: the traditional East Asian reckoning counts you as one at birth and adds a year at new year, which can put you two years ahead of your Western age. Even within one system, precision matters for different reasons. Forms want completed years. Medical records for infants want months. Legal thresholds - driving, voting, drinking, retirement - hinge on a specific date, not a rounded number, and being one day short is decisive. Then there is 29 February: someone born on a leap day has no birthday in three years out of four, and jurisdictions genuinely differ on whether they legally age on 28 February or 1 March. This gives an exact years, months and days figure with leap years handled correctly, calculated in your browser.

Cómo usar esta herramienta

  1. Enter the birth dateWatch the date format - 03/04 means March 4th in the US and 3rd April in most other places.
  2. Set the end date if neededDefaults to today. Change it to work out age at a past or future point, such as on an application deadline.
  3. Read the breakdownYears, months and days together, which is what forms and records usually want.
  4. Use the exact figure for anything with a thresholdWhere eligibility depends on a specific date, the precise result is what matters, not a rounded year.

Por qué usarla

  • Exact years, months and days rather than a rounded year count.
  • Leap years handled correctly, which is where manual counting fails.
  • Works to any end date, so you can check age as of a future deadline.
  • Runs in your browser - a birth date is personal data and is never transmitted.
  • No account and nothing stored between visits.

Usos comunes

  • Filling in a form that asks for exact age in years and months.
  • Checking eligibility against an age threshold on a specific date.
  • Recording an infant's age in months for medical or developmental milestones.
  • Working out how old someone will be on a future date.
  • Calculating years of service or tenure from a start date.

Consejos para mejores resultados

  • Check the date format before trusting the result. Day-first and month-first conventions produce plausible but wrong answers.
  • For age thresholds, use the exact date rather than the year. Being a day short of eighteen is legally decisive.
  • For infants, months is the meaningful unit - "14 months" says far more than "1 year".
  • Set a future end date to answer "how old will they be at the wedding" without counting manually.
  • To measure between two arbitrary dates rather than from a birth date, the Date Difference tool does the same maths without the age framing.

Errores a evitar

  • Subtracting birth year from current year, which is wrong for anyone whose birthday has not yet occurred this year.
  • Mixing up day-first and month-first date entry, especially between US and international forms.
  • Rounding age up when a form asks for completed years - it asks for the birthday you have actually had.
  • Assuming leap-day birthdays have a universal legal rule. Jurisdictions genuinely differ between 28 February and 1 March.
  • Applying Western age reckoning where a different convention is expected, which can differ by up to two years.

Preguntas frecuentes

Yes - the calculation properly accounts for leap years when determining exact age or the number of days between dates.

If the tool supports a custom "end date" input (rather than always using today), you can calculate the exact duration between any two dates, not just up to the present.

Years, months and days together - "27 years, 4 months, 12 days" - which is what forms and medical records normally want rather than a rounded year count.

Change the end date from today to whatever date you need. This is how you check eligibility as of an application deadline, or work out how old someone will be at an event.

It varies by jurisdiction. Some treat 28 February as the birthday in non-leap years, others 1 March, and the rule can differ between legal and administrative contexts even within one country. Check the specific rule where it matters.

No. The calculation runs in your browser and nothing is transmitted - which matters, because a birth date is personal data.

Yes. Age Calculator is free for normal use with no account required, and ToolBox does not add a watermark to your result.

Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.

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