WJ-IV age calculator
Compute the exact chronological age for the Woodcock-Johnson IV — the cognitive, achievement and oral language batteries. Enter the date of birth and the test date to get years; months; days behind the age-based norms — one examinee or a whole caseload.
Riverside's WJ-IV scoring rounds age to the nearest month (15-day rule), so this page defaults to that setting — switch to Exact for the raw years;months;days. Confirm against your WJ-IV scoring (Riverside Insights).
Corrected age for prematurity
Corrected age subtracts the weeks born early from the term due date. Many clinicians stop correcting at 24 months (AAP) — some protocols use 36. Follow your own protocol; this is a labelled default, not a rule.
How we calculate this
Score a whole caseload at once. Rows are saved in this browser only — no accounts, nothing uploaded.
| Student | Date of birth | Test date | Age |
|---|
- Nearest-month age as Riverside scores it — toggle for exact Y;M;D.
- Caseload mode for a full assessment roster.
- Private — dates never leave your browser.
Chronological age for the WJ-IV
The WJ-IV (Woodcock-Johnson IV) is a broad family of individually administered batteries — Tests of Cognitive Abilities, Tests of Achievement andTests of Oral Language — published by Riverside Insights. It is normed across an unusually wide span, roughly age 2 through 90-plus, and reports age-based standard scores that compare an examinee against peers of the same chronological age. That makes the age you record the pivot the whole score set turns on.
Exact age and the WJ-IV online scoring
Most examiners score the WJ-IV through its online scoring program, which computes the chronological age for you — but only from the two dates you type in. If the date of birth or the test date is entered wrong, the platform will happily report age-based norms for the wrong age. Calculating the exact age here first gives you an independent check to confirm the dates and the age agree before you trust the scores.
Compute from the test date
Enter the date of birth and the date the WJ-IV was administered. The exact age counts leap-aware and correct at month boundaries — for example a student born 8 July 2015 and tested on 19 March 2024 is 8;8;11. Because the 11 leftover days are under 15, Riverside's nearest-month rounding scores that as 8;8 (had it been 15 days or more, it would round up to 8;9) — which is what this page shows by default. Switch the toggle to Exact to see the full years; months; days, and the “How we calculate this” panel shows the working for your own dates.
Which rounding does the WJ-IV use?
Unlike most tests, the WJ-IV has a documented rule: Riverside's scoring rounds the examinee's age to the nearest month. An age that carries 15 or more days past the last whole month rounds up to the next month — so an exact 6;11;15is scored as 7;0. This page therefore defaults to that round-to-nearest-month (15-day) setting so the age matches what your scoring reports; the toggle switches to the exact years; months; days whenever you want the raw count. Still confirm the figure your own WJ-IV scoring produces, and see the sources note below.
Related ChronoAge Pro tools
WJ-IV chronological age — FAQ
How do I calculate chronological age for the WJ-IV?
Enter the examinee's date of birth and the WJ-IV administration date. This page shows the age the WJ-IV scores against — rounded to the nearest month, the way Riverside's scoring does it — and the toggle switches to the exact years; months; days if you want the raw count. Enter the same two dates into your WJ-IV scoring so the reported age and the norms agree.
Who publishes the WJ-IV and what does it cover?
The Woodcock-Johnson IV (WJ-IV) is published by Riverside Insights — not Pearson. It is a family of batteries spanning cognitive abilities, academic achievement and oral language, normed across a very wide age range from roughly 2 years through 90-plus, which makes it common in schools and clinics alike.
Does the WJ-IV round the chronological age?
Yes. Riverside's WJ-IV scoring rounds the examinee's age to the nearest month — an age carrying 15 or more days past the last whole month rounds the month up (so an exact 6;11;15 is scored as 7;0). Because that is how the WJ-IV norms are actually looked up, this page defaults to the round-to-nearest-month (15-day) setting; flip the toggle to exact years; months; days when you want the raw calendar age. Source: Riverside Insights Self-Help Portal, "Why is my examinee's age being rounded up in Woodcock-Johnson IV assessments?"
Why does exact age matter for the WJ-IV?
The WJ-IV reports age-based standard scores by comparing an examinee against peers of the same chronological age. Across such a broad age range the age-based reference groups shift continuously, so an accurate age is what keeps the standard scores, percentiles and age-equivalents meaningful.
Can I calculate WJ-IV ages for a whole caseload?
Yes — switch to Caseload mode when you are scoring a WJ-IV achievement caseload. Add each student's label and date of birth, set the test date, and copy the finished table straight into your notes or against the age Riverside's online scoring computes for each row. Everything stays in your browser — rows are saved locally and no student data is uploaded.