Behavior & adaptive · Pearson
Vineland-3 Age Calculator
Chronological age in years;months.days for the Vineland Adaptive Behavior Scales, Third Edition, with the published age range Birth – 90:11 checked for you.
Vineland-3 at a glance
| Full name | Vineland Adaptive Behavior Scales, Third Edition |
|---|---|
| Publisher | Pearson |
| Published age range | Birth – 90:11 |
| Age format | Years;months.days |
| Corrected age | Correction for prematurity is not applied by default; where a team uses it for an infant, state so explicitly in the report. |
| Discipline | Behavior & adaptive |
The Vineland-3 measures adaptive functioning through interview or rating form and is required evidence for intellectual disability determinations. It is also the standard adaptive measure in autism and developmental-disability evaluations across the lifespan.
How the Vineland-3 wants the age entered
Enter the exact chronological age in years;months.days. Adaptive-behaviour norms are banded tightly in early childhood and widen with age.
The underlying calculation is the same for every instrument — complete years, complete months, then the leftover days. What differs is which part of it goes on the form. The calculator above reports all four figures at once, so you can copy the one the Vineland-3 manual asks for without recalculating:
- Years;months.days — the full record-form format, e.g. 1;6.20
- Years;months — complete units only, e.g. 1;6
- Complete months — e.g. 18 months
- Rounded to nearest month — e.g. 19 months (1;7), using the 15-day threshold
The exact date arithmetic, including month-end clamping and leap-day handling, is documented in the calculation methodology.
Worked example
A child born February 26, 2025 and assessed on September 15, 2026:
- Chronological age: 1 year, 6 months, 20 days
- Record on the Vineland-3 as: 1;6.20
- Day remainder: 20 days — 15 or more, so a nearest-month rounding rounds up
Enter these exact dates above to reproduce the result. Every figure on this page is computed by the same library that runs the calculator, so the worked example and the tool can never disagree.
Corrected age and the Vineland-3
Correction for prematurity is not applied by default; where a team uses it for an infant, state so explicitly in the report.
Corrected (adjusted) age is measured from the due date rather than the birth date. Switch the calculator above to Born preterm and enter the gestational age at birth to see both figures side by side. The dedicated adjusted age calculator adds gestational and postmenstrual age, and the corrected age guide explains the convention for families.
Other instruments
Same calculation, different recording format. These are the instruments most often administered alongside the Vineland-3:
| Instrument | Age range | Age format |
|---|---|---|
| ABAS-3 | Birth – 89:11 | Years;months |
| BASC-3 | 2:0 – 21:11 (self-report 6:0 – 25:11) | Years;months |
| Conners 4 | 6:0 – 18:11 | Years;months |
| WISC-V | 6:0 – 16:11 | Years;months.days |
| WPPSI-IV | 2:6 – 7:7 | Years;months.days |
| WAIS-5 | 16:0 – 90:11 | Years;months.days |
The full list is on the assessment instrument reference, and the assessment age calculator covers any instrument not listed individually.
Vineland-3, Pearson are trademarks of their respective owners. AgeCalc is not affiliated with, endorsed by, or sponsored by any of them. Brand names are used descriptively to identify the assessment formats this calculator supports.