Ounces (oz) to Kilograms (kg) Converter
Enter a value to instantly convert between weight units.
1 Ounce = 0.0283 Kilogram
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
kg = oz × 0.0283495The ounce is a traditional unit of weight used in the US for food, packages, and precious metals. One ounce equals 28.349523125 grams, and since there are 1000 grams in a kilogram, that's about 0.02835 kg per ounce. US food labels, postal services, and shipping companies often need to convert between ounces and kilograms when working with international partners or metric documentation.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A US recipe calling for 1 lb of flour (16 oz) converts to 0.454 kg — a European baker's scale shows 454 g.
16 oz = 0.454 kg
A postal package weighing 32 oz (2 lbs) needs to be declared in kg for international shipping — 0.907 kg.
32 oz = 0.907 kg
A food package label shows 8 oz of cereal — 0.227 kg for the nutrition database that uses metric.
8 oz = 0.227 kg
A small envelope with 1 oz of documents — 0.0283 kg for the air freight weight declaration.
1 oz = 0.0283 kg