Last updated
Find age in years, months, and days from a birth date to today or a target date.
Quick answer: Age Calculator
Exact age is calculated from date of birth to the selected date, counting full years, months, and days. Leap years and birthday boundaries can change the final day count.
Example: Someone born on 15 June 1995 is 31 years old on 15 June 2026.
Calculations follow the documented formula on this page; rounding and input units can change the last digit-treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
Handy for eligibility cutoffs, school enrollment, or visa rules where “18 on arrival” isn’t fuzzy. Leap years and month lengths are handled for you - no mental calendar gymnastics.
Find age in years, months, and days from a birth date to today or a target date.
Inputs on this page: Birth Date (YYYY-MM-DD), As Of Date (YYYY-MM-DD, optional). Assumptions stay visible so you can reproduce the figure elsewhere.
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
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Read guide →HR departments, parents, schools, medical administrators, and legal teams use exact age calculations when eligibility depends on a date. It is useful for school year placement, screening windows, retirement planning, and deadline checks.
Continue in the Utility category hub, the Utility tools collection, or the glossary. Related calculators in this session: CM to Feet Converter, KG to LBS Converter, Time Zone Converter, Date Difference Calculator, Daily Calorie Calculator, Word Counter.
The Formula
Age calculated from birth date to as-of date in years/months/days| This tool | Age calculated from birth date to as-of date in years/months/days |
|---|---|
| Related intent: age calculator | See paired tools for age calculator-each page documents its own core relationship next to the live form. |
| Related intent: age calculator usa | See paired tools for age calculator usa-each page documents its own core relationship next to the live form. |
Core relationship for Age Calculator:
Age calculated from birth date to as-of date in years/months/days
Worked check: Born 2007-11-03, as of 2026-04-09 → 18 years, 5 months, 6 days - useful for driver’s-license or voting timelines.
Keep the same assumptions and open a neighbor calculator when your question branches: CM to Feet Converter, KG to LBS Converter, Time Zone Converter, Date Difference Calculator. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
Someone born on 15 June 1995 is 31 years old on 15 June 2026.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
HR departments, parents, schools, medical administrators, and legal teams use exact age calculations when eligibility depends on a date. It is useful for school year placement, screening windows, retirement planning, and deadline checks.
Instant response
Run Age Calculator in the browser and read the breakdown beside the form.
Transparent formula
The formula and worked example on this page match what the calculator uses.
Privacy friendly
No account required; inputs stay in your session unless you choose to share them.
Cross-device ready
Layout works on mobile, tablet, and desktop for the same field labels.
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
Reviewed July 18, 2026 · Content stamp 2026-07-18
Click a question to expand the answer.
Yes, use the optional as-of date field. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
The tool returns an input validation error for invalid chronology. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Yes, output includes year/month/day style breakdown. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Use as a quick estimate and verify against official legal criteria where required. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Yes, leap years are handled in date calculations. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Exact years, months, and days between a birth date and any “as of” date you pick. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Born 2007-11-03, as of 2026-04-09 → 18 years, 5 months, 6 days - useful for driver’s-license or voting timelines. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Some countries count lunar birthdays differently - always confirm local law. Insurance often uses nearest birthday; HR might use calendar age only. Save the “as of” date when you screenshot results for records. For Age Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is Age calculated from birth date to as-of date in years/months/days, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final age calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
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Reviewed by Toollabz Editorial
Product editor | Last reviewed July 18, 2026
See methodology and editorial policy.