Last verified: August 2026 · Methodology
Test Age Calculator
Last verified: August 2026
This test age calculator figures out chronological age and formats it the way your assessment manual wants it. Pick your publisher — WISC-V, BRIGANCE, Pearson, Super Duper — and get results with the right rounding rules already applied. No more flipping through manuals to remember whether days round up or down.
Assessment Details
Test Age Result
Chronological Age:
Enter dates to calculate test age
Why Getting Test Age Right Actually Matters
Need unrounded calendar age before publisher rules? Use the chronological age calculator, then pick a mode here.
Here is the deal — test age calculation is not just paperwork. It's what determines which norm group a child gets compared against. Mess this up by even a few days and the kid lands in the wrong comparison bucket. Same raw score, wrong age = wrong percentile, which can change the entire interpretation.
Each Publisher Wants It Different
This is exactly why we built separate modes. Each publisher has their own rounding quirks, and our calculator handles them:
- Pearson (WISC-V, WAIS-IV, KTEA): Rounds to nearest month — hit the day threshold and the month rounds up. Otherwise it rounds down.
- BRIGANCE: No rounding at all. Exact age in years, months, days — that is what the protocol calls for.
- WISC standalone: Uses Wechsler's own conventions, which are close to Pearson but not identical.
- Super Duper: Rounds down, always. Days get dropped, never rounded up.
Best Practices From People Who Actually Do This
Always double-check against the manual for the edition you're using. Publishers do change rounding rules between editions — what worked for the WISC-IV does not necessarily carry over to the WISC-V.
Write down the birth date, testing date, and calculated age in your report. When someone asks how you got that score, you want to be able to show your work. Trust us on this one.
Related Assessment Tools
One testing date, one rule
Pick the administration date before you pick a mode. An age computed the day you write the report can cross a birthday that had not happened in the session. Standard mode keeps days. Clinical mode rounds at 16 days for Wechsler-style forms. BRIGANCE mode stays exact. Super Duper mode keeps a semicolon Y;M;D. Use one mode per protocol. If two tests happened the same morning and want different formats, run the dates twice and label the lines. The methodology page is the short description of those modes. The manual in the kit still wins if it disagrees.
This page does not look up norms or decide eligibility. Corrected age for a preterm child is a different calculator. Dates stay in the browser.