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Pediatric Weight Estimation
Input
Note: These are estimates only. Actual measured weight should always be used when available.
APLS Estimated Weight
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About
Pediatric weight estimation formulas provide an approximate body weight when a child's actual weight cannot be measured (e.g., emergency situations). The APLS formula is age-dependent with three ranges, while the Luscombe formula uses a single equation for ages 1–12. These are estimates only — actual measured weight should always be used when available. The Broselow tape is another common method for weight-based dosing in emergencies.
Formula
APLS: <1yr: (0.5 × age_months) + 4 kg
APLS: 1–5yr: (2 × age_years) + 8 kg
APLS: 6–12yr: (3 × age_years) + 7 kg
Luscombe (1–12yr): (3 × age_years) + 7 kg
Interpretation
| Age | APLS Estimate | Typical Range |
|---|---|---|
| Newborn | 4 kg | 2.5–4.5 kg |
| 6 months | 7 kg | 5.5–8.5 kg |
| 1 year | 10 kg | 8–12 kg |
| 5 years | 18 kg | 15–22 kg |
| 10 years | 37 kg | 28–45 kg |
References
- Luscombe M, Owens B. Weight estimation in resuscitation: is the current formula still valid? Arch Dis Child. 2007;92(5):412-415.
- Advanced Paediatric Life Support (APLS): The Practical Approach. 6th ed. BMJ Books; 2016.
FAQ
Disclaimer
For educational and informational purposes only. Not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.