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Precise, browser-based age calculator using APA borrowing method for clinical and daily accuracy.
Have you ever noticed that most age calculators just divide the number of days between two dates by 365.25 and call it done? For casual use, that's fine. But in clinical psychology, pediatrics, and school enrollment, a 30-day error isn't a rounding detail — it's a misdiagnosis, a wrong grade placement, or an invalid test score. When a psychologist scores a WISC-V or WAIS-IV assessment, the age entered must be exact to the day. The wrong method quietly corrupts the result.
https://myage.tools is a free, browser-based chronological age calculator built around the APA-recommended borrowing method — the same standard used in clinical and educational assessment worldwide. Enter a birth date and a reference date, and get a precise breakdown: years, months, and days, plus total months, weeks, days, hours, minutes, and seconds. No guesswork. No hidden rounding.
Most calculators subtract years, then months, then days — and stop there. The APA borrowing method goes further: when the day or month subtraction would go negative, it "borrows" from the next unit, exactly like column subtraction in arithmetic. The tool shows every step of this process transparently, so you can verify the calculation yourself.
The difference? Up to 30+ days of error in edge cases involving month-end birthdays, leap years, or cross-year date spans. In psychological testing, that gap can shift a child into a different normative age band entirely.
Clinical psychologists — Score WISC-V, WAIS-IV, Bayley-4, and other standardized assessments with confidence. The borrowing method matches the manual's own age calculation protocol.
Pediatricians — Calculate corrected gestational age for premature infants. Adjusted age calculations require month-level precision that simple division cannot reliably provide.
School administrators & parents — Determine enrollment eligibility against cutoff dates. A child born one day before the deadline deserves an accurate answer, not an approximation.
You don't need to be a clinician to care about precision.
Every calculation runs entirely in your browser. Your birth date never leaves your device — no server request, no database entry, no analytics tied to your query. There's no account to create, no email to provide, and no ads to click past. Just open the page and calculate.
