Developmental & early childhood · Curriculum Associates
BRIGANCE IED III Age Calculator
Chronological age in years;months for the BRIGANCE Inventory of Early Development III, with the published age range Birth – 7:11 checked for you.
BRIGANCE IED III at a glance
| Full name | BRIGANCE Inventory of Early Development III |
|---|---|
| Publisher | Curriculum Associates |
| Published age range | Birth – 7:11 |
| Age format | Years;months |
| Corrected age | Prematurity adjustment follows the same convention as the Screens for children under 2. |
| Discipline | Developmental & early childhood |
The IED III is the criterion-referenced companion to the Screens, producing developmental age equivalents across motor, language, academic and daily-living domains. It is used to build IEP goals rather than to make a pass/fail screening decision.
How the BRIGANCE IED III wants the age entered
Record chronological age as years;months for criterion-referenced comparison, and use the rounded age where a standardized Screens-style entry point is needed.
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 BRIGANCE IED III 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 BRIGANCE IED III as: 1;6
- 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 BRIGANCE IED III
Prematurity adjustment follows the same convention as the Screens for children under 2.
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 BRIGANCE IED III:
| Instrument | Age range | Age format |
|---|---|---|
| Bayley-4 | 16 days – 42 months | Years;months.days |
| Mullen | Birth – 68 months | Years;months.days |
| DAYC-2 | Birth – 5:11 | Total months |
| BDI-3 | Birth – 7:11 | Total months |
| ASQ-3 | 1 – 66 months | Total months |
| ASQ:SE-2 | 1 – 72 months | Total months |
The full list is on the assessment instrument reference, and the assessment age calculator covers any instrument not listed individually.
BRIGANCE IED III, Curriculum Associates 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.