Age-based weight formula — RACP Paediatrics MCQ

Instant feedback + full explanation. One question, done properly.

EasyEmergencyAge-based weight formulaRACP Paediatrics

An age-based formula is sometimes used for quick weight estimation. What is the most commonly used formula for children aged 1-5 years?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — Age-based formula

The commonly used age-based formula for 1-5 years is: Weight (kg) = (Age in years + 4) × 2. For example, a 3-year-old: (3+4) × 2 = 14 kg. These formulas are quick but less accurate than length-based tapes, particularly in obese or malnourished children. They provide a starting point when no other method is available.

Reference: RCH Melbourne – 2023 – Resuscitation CPG; APLS Guidelines