Pediatric Weight Converter (lb/oz <-> kg)

Convert a pediatric weight between pounds (decimal), pounds-and-ounces, and kilograms - the three units in active use at the bedside.

Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.

Example

Weight in pounds: 7
Plus ounces: 5
OR weight in kilograms: 3.5

Result: 7 lb 5 oz ~ 3.317 kg; 3.5 kg ~ 7 lb 11.5 oz.

The tool opens with these values already filled in. Replace them with your own.

What you enter

Weight in pounds
Plus ounces
OR weight in kilograms

What this is

Hospitals chart pediatric weight in kilograms because pediatric medications are dosed per-kg, but families remember the birth weight or the last visit weight in pounds and ounces, and the pediatric scale at home often reads in mixed units. Sophie Well runs the conversion both ways (1 lb = 0.453592 kg, 16 oz = 1 lb), rejects invalid inputs like "16 oz" inside a lb-oz field, and shows the AAP neonatal weight bands (low birth weight, very low, extremely low) for context.

When to use it

Use this in any pediatric visit, EMS transport, or weight-recorded encounter where the unit recorded in the source differs from the unit the receiving system needs - newborn nursery transfer notes, growth-chart entry where the parent reports lb/oz, prehospital weight estimation, or formula and medication dosing at home. The conversion is mechanical and exact; the value of this tool is the input parsing (you can paste "7 lb 5 oz" or "7.31 lb" or "3.32 kg" and get matched outputs) and the neonatal-band labels that flag when a documented weight crosses a clinically relevant threshold.

How this is calculated

1 lb = 0.453592 kg. Reference newborn / infant weight bands per AAP.

A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.