MABC-2 Age Calculator

The MABC-2 assesses manual dexterity, aiming and catching, and balance, and is a core instrument in developmental coordination disorder evaluation. Because the item set changes between age bands, an age error means the wrong tasks, not just the wrong table.

Record chronological age as years;months. The MABC-2 groups children into three age bands (3–6, 7–10, 11–16) with different item sets, so the recorded age selects the tasks administered.

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 MABC-2 manual asks for without recalculating:

• Years;months.days — the full record-form format, e.g. 4;6.20
• Years;months — complete units only, e.g. 4;6
• Complete months — e.g. 54 months
• Rounded to nearest month — e.g. 55 months (4;7), using the 15-day threshold

The exact date arithmetic, including month-end clamping and leap-day handling, is documented in the calculation methodology.

A child born February 26, 2022 and assessed on September 15, 2026:

• Chronological age: 4 years, 6 months, 20 days
• Record on the MABC-2 as: 4;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.

Same calculation, different recording format. These are the instruments most often administered alongside the MABC-2:

The full list is on the assessment instrument reference, and the assessment age calculator covers any instrument not listed individually.