Table 1

Existing age-based weight estimation rules

SourceAge rangeWeight, kgCountry
Advanced Paediatric Life Support Course (APLS)31–102a+8UK
Australian Resuscitation Council (ARC)41–92a+8Australia
10+3.3a
Nelson51–62a+8USA
7–12½ (7a–5)
Shann61–92a+9New Zealand
10+3a
Tintinalli7 (similar to Leffler)81–122a+10USA
Tinning9 (known as “Best Guess”)1–52a+10Australia
6–144a
Argall101–103a+6UK
Luscombe111–103a+7UK
Theron61–10e(2.197099 + 0.175571a)New Zealand
  • a, age in years.

  • For ease of comparison, formulae have been rearranged appropriately for consistency of layout and in order from smaller to larger. For example, the APLS formula is more commonly described as (a + 4)×2, which is the same as 2a+8.