About this tool

Clinical Weight Converter

Convert body weight between kilograms, grams, pounds, pounds and ounces, and stones, with newborn and infant rounding steps.

The Clinical Weight Converter changes a body weight between kilograms, grams, decimal pounds, pounds-and-ounces and stones-and-pounds using the exact international pound of 0.45359237 kg and the 14-pound stone. It also applies the recording step that matches the age group — nearest 5 g for a newborn, nearest 10 g for an infant, nearest 0.1 kg for a child or adult — and shows how many grams that rounding moved the figure. It is aimed at anyone filling in a clinical form, a growth chart or a dosing calculation where the units on the scale and on the paperwork differ.

How to use Clinical Weight Converter

1. 1

   Open Clinical Weight Converter on AltFTool — it loads instantly in your browser.

2. 2

   Enter the values you already know.

3. 3

   Fine-tune the options to match your scenario.

4. 4

   Read the result and use it in your planning or reporting.

Why use Clinical Weight Converter

• Exact pound

  Uses 0.45359237 kg rather than a 2.2 shortcut, which drifts by grams on infant weights.

• Age-appropriate precision

  Separate rounding steps for newborns, infants and everyone else, with the shift shown in grams.

• Every clinical format

  Decimal kilograms, grams, decimal pounds, pounds-and-ounces and stones-and-pounds side by side.

Common use cases

• Convert a birth weight reported as 7 lb 8 oz into the 3.4 kg figure a growth chart expects.
• Turn a UK 11 st 4 lb reading into 71.7 kg for a weight-based drug dose.
• Record a neonatal scale reading of 3437 g at the nearest 5 g used on the ward chart.
• Check how much a 0.1 kg rounding step shifts a figure before using it in a mg/kg calculation.

Frequently asked questions