Brigance Age Calculator

This is the single thing that separates a BRIGANCE age from almost every other assessment age, and it is where generic age calculators give the wrong answer. Most instruments want complete years and months, with the leftover days dropped. BRIGANCE wants the age rounded to the nearest month, because the rounded figure is what names the age-specific Data Sheet.

The published rule is a 15-day threshold:

• Fewer than 15 days left over — ignore the days and use the years and months as they stand.
• 15 days or more — round the month up by one.

So a child who is 3 years, 9 months and 15 days old is recorded as 3;10, not 3;9. Truncating there would put you on the wrong Data Sheet and compare the child against the wrong expectations.

A child born January 10, 2021 and assessed on June 5, 2026:

• Exact chronological age: 5 years, 4 months, 26 days (5;4.26)
• Rounded to the nearest month: 5;5 — the 26-day remainder is 15 or more, so the month rounds up
• Rounded total months: 65 (complete months would be 64)
• Data Sheet: Five-Year-Old, on the Early Childhood Screen III (3–5 years)

Try these exact dates in the calculator above; the output always matches the documented calculation method.

For a child under 2 at the assessment date, BRIGANCE screening subtracts the number of weeks the child was born early from the chronological age before rounding. The calculator above shows a weeks premature selector (0–16) as soon as the dates you enter describe a child under 2, and reports both the adjusted and the unadjusted figures so the report can show its working.

A baby born 8 weeks early and screened at 14 months chronological is screened against roughly 12 months of expectations — a difference large enough to change the screening outcome at that age. Past the second birthday the adjustment is no longer applied, which is why the input disappears. The adjusted age calculator covers the broader corrected-age question, including gestational and postmenstrual age.

Both figures have a job, and a good report carries both:

If you are also administering a Pearson-published battery in the same session, note that it will want the truncated figure — the Pearson age calculator shows that format, and the assessment age calculator shows all of them at once.

• Birth date: the child's actual date of birth
• Assessment date: the date the Brigance screen or inventory is administered — not today's date if testing happened earlier
• Rounded age: complete years and months, with the day remainder rounding the month up at 15 days or more
• Prematurity: weeks born early are subtracted from chronological age for children under 2, then the result is rounded
• Month-end and leap-day edge cases follow the site-wide methodology

The Brigance Assessment system is a comprehensive set of developmental screening and diagnostic tools used in early childhood education and special education settings. Created by Albert H. Brigance, these assessments help identify children who may need additional support or intervention.

Accurate age calculation is essential for Brigance assessments because developmental expectations vary significantly even within small age ranges during early childhood.

Common Brigance assessments that require chronological age include:

• Brigance IED III: Inventory of Early Development for children birth through age 7
• Brigance Screens III: Quick developmental screenings for specific age ranges
• Brigance CIBS: Comprehensive Inventory of Basic Skills for PreK through grade 9
• Brigance Transition Skills: For adolescents and young adults transitioning to adulthood

Dedicated pages with age ranges and format guidance: BRIGANCE Screens III and BRIGANCE IED III. Working across publishers? The instrument reference lists the age format for 40+ assessments, and the assessment age calculator shows every format from a single input.