1. What is the ASQ Age Calculator?

The ASQ (Ages & Stages Questionnaires) Age Calculator determines a child's age in months for accurate developmental screening. It calculates the precise age based on birth date and current date.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• 30.4375 — Average number of days per month (365.25 days/year ÷ 12 months)
• Current Date — Date of assessment
• Birth Date — Child's date of birth

Explanation: The calculator first computes the exact days between dates, then converts to months using the average month length.

3. Importance of Age Calculation

Details: Accurate age calculation is crucial for developmental screening as ASQ questionnaires are age-specific. Even small age differences can affect which questionnaire should be used.

4. Using the Calculator

Tips: Enter the child's birth date and the current assessment date. The calculator will display the age in months with decimal precision for accurate questionnaire selection.

5. Frequently Asked Questions (FAQ)

Q1: Why use 30.4375 days per month?
A: This accounts for the average month length including leap years (365.25 days/year ÷ 12 months = 30.4375 days/month).

Q2: How precise should the age calculation be?
A: ASQ recommends calculating age to two decimal places for accurate questionnaire selection.

Q3: What if the child was born prematurely?
A: For premature births (before 37 weeks), use adjusted age (chronological age minus weeks premature) until 24 months.

Q4: Why are there two calculation methods?
A: The alternative days-based method provides a cross-check. Both methods should yield similar results.

Q5: What's the age range for ASQ?
A: ASQ-3 covers 1-66 months; ASQ:SE-2 covers 1-72 months. Age must be precise to select the correct questionnaire.