Why the calculators are split
Every standardized score starts from the same subtraction: testing date minus date of birth. Publishers then disagree about rounding and about how many fields to print. Wechsler-style conventions used with WISC-V and WAIS-IV often round to the nearest month, with 16 or more days bumping the month. BRIGANCE early childhood screens, in the examiner materials, stay with exact years, months, and days. Speech-language protocols that ask for Y;M;D want the semicolons and the leftover days kept. A single unlabeled “age” box hides which of those you applied.
ChronoCalc is not Pearson, Curriculum Associates, or Super Duper software. These pages do not contain test items, norms, or score tables. They compute a chronological age and format it in the shape described on our methodology page. If the current manual for your edition says something different, follow the manual and tell us. Edition changes are why each clinical page carries a verification note instead of a claim that the publisher certified the widget.
How to pick a page
Use Pearson / WISC or the WISC age calculator when the manual wants nearest-month rounding. Use BRIGANCE when you need exact age for a screen. Use Super Duper when you are matching that publisher’s Y;M;D habit. Use the test age calculator when you want the mode switch in one place. Use the CELF-5 page for that battery’s age line. If you are not scoring a named test, the chronological age calculator in standard mode is the exact calendar span.
Corrected age is not an assessment mode. It adjusts for prematurity before you compare a young child to a milestone list. That calculation lives on the corrected age calculator. Do not turn on clinical month-rounding and call the result corrected age. They answer different questions.
What we will not add
A directory entry is not a promise that a publisher’s online scoring system is reproduced here. We will not publish stimulus content or basal and ceiling rules. If your battery is missing from the list, the general test-age tool still does calendar math; write to contact with the manual’s age rule, in your own words, if you want a format note. We do not invent a rounding rule we have not described on the methodology page.
Dates of birth typed into any of these tools stay on the device. The comparison of formats is also written up on the comparison matrix.
A practical order: write down the test name, the administration date, and whether the manual keeps days. Then open only the matching calculator. Running Pearson rounding and BRIGANCE exact age on the same morning is normal; filing both under one “age” line is not. If the child was born preterm and the protocol still wants chronological age, do not silently substitute corrected age. Label whichever span the manual told you to use, and keep the other in the narrative if the team needs it. When you email a request for another battery, quote the manual’s age sentence. A product name alone is not enough to invent a rounding rule. Until that note exists, use exact age and say that you did. Do not round “to be safe.”