🧒 Pediatric Weight Estimation (APLS)
This tool estimates a child's weight from age using the APLS/Luscombe formulas when weighing is not possible.
Pediatric Weight Estimation (APLS)
Age unit
Age
When to use
Use in emergencies to derive a working weight for drug dosing, equipment sizing, and defibrillation energy.
How it works
Months: 0.5 × months + 4. Years 1–5: 2 × years + 8. Years 6–12: 3 × years + 7.
Key points
- The estimate is for emergencies only — when weighing is possible the measured weight always takes precedence. (original synthesis · not guideline verbatim)
- Deviation is large in obese or developmentally atypical children.
- Different formulas apply to infants versus older children, so the correct age band must be selected.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.