Body weight and baby weight are often written as a compound value like “8 lb 6 oz” rather than a single decimal number, this calculator converts that compound format directly to kilograms and grams, or works in reverse from a metric weight.

How to use this pounds and ounces calculator

1. Choose your conversion direction: Pounds & Ounces, or Kilograms.
2. If converting from imperial, enter the Pounds and Ounces separately (e.g. 8 and 6 for “8 lb 6 oz”).
3. If converting from metric, enter a single Kilograms value.
4. Read the result in Kilograms, Grams, or Pounds & Ounces, plus Total Ounces.

What this calculator does

16 ounces make up 1 pound, so a compound weight like “8 lb 6 oz” needs both numbers combined before it converts cleanly to a single metric figure. This calculator handles that combination automatically in either direction, compound imperial to metric, or metric back to the compound pounds-and-ounces format most commonly used for reporting body weight and newborn weight.

Why this format matters for baby weight and body weight

Birth weight and body weight are conventionally reported in the US and UK using the pounds-and-ounces compound format rather than a decimal pound or a metric figure, so converting a metric weight (say, from a hospital record using kilograms) into the familiar “X lb Y oz” format, or vice versa, is a common practical need this calculator addresses directly.

Frequently asked questions