basic

Pediatric Weight Estimate from Age Calculator

APLS age-based weight estimate (1-10 years).

Estimate a child's weight from age using the APLS formula (in kg): for ages 1-5 → 2·age + 8; for ages 6-12 → 3·age + 7. Accurate for emergency drug-dosing in the absence of a scale.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

yr

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

If age ≤ 5: wt ≈ 2·age + 8. If 6-12: wt ≈ 3·age + 7.

In depth

Estimate a child's weight from age using the APLS formula (in kg): for ages 1-5 → 2·age + 8; for ages 6-12 → 3·age + 7. Accurate for emergency drug-dosing in the absence of a scale.