What this conversion means in practice
Ounces linger on US packaging; kilograms anchor SI science and most customs declarations. The ounce here is avoirdupois, tied to the same pound definition as the rest of this site.
Twelve ounces is about 0.34 kg—also exactly 0.75 lb, which is a good cross-check. Sixteen ounces make one pound, so large oz counts should be sanity-checked against lb before converting to kg.
If the label only shows fluid ounces, stop—this page is for mass ounces, not volume.
How to convert ounce to kilogram
Multiply the ounce value by 0.0283495 to get kilogram.
Example: 12 oz × 0.0283495 = 0.340194 kg
Ounce
Definition: The avoirdupois ounce (oz) is 1/16 of a pound, equal to 28.349523125 grams. This is the ounce used for food and general weight in the US customary system.
History and origin: Different ounce definitions existed historically, including the troy ounce used for precious metals. Modern everyday weight conversion uses the avoirdupois ounce standardized with the pound.
Current use: Ounces are common in food packaging, recipes, and shipping. In technical contexts, confirm the ounce type, since precious-metal pricing uses a different standard.
Kilogram
Definition: The kilogram (kg) is the SI base unit of mass. Since 2019, it is defined through the fixed value of Planck's constant, which ties it to fundamental physics rather than a physical metal artifact.
History and origin: Earlier standards linked the kilogram to water volume, then to a platinum-iridium cylinder kept near Paris. The 2019 redefinition kept practical measurements the same while making the unit more stable and reproducible worldwide.
Current use: Kilograms are standard in science, medicine, manufacturing, shipping, and daily life across most countries. Even where pounds are common in daily speech, kilogram-based systems are heavily used in industry and regulation.
Ounce to Kilogram conversion table
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 0.1 oz | 0.00283495 kg |
| 1 oz | 0.0283495 kg |
| 2 oz | 0.056699 kg |
| 3 oz | 0.0850485 kg |
| 5 oz | 0.1417475 kg |
| 10 oz | 0.283495 kg |
| 20 oz | 0.56699 kg |
| 50 oz | 1.417475 kg |
| 100 oz | 2.83495 kg |
| 1,000 oz | 28.3495 kg |
Ounce to Kilogram FAQ
oz to kg for imports, dietary analysis, and mixed-unit BOMs.
How many kg is 16 oz?
About 0.454 kg—because 16 oz is one avoirdupois pound (0.45359237 kg).
Fluid ounces?
Convert volume on a volume tool unless you know density to derive mass.
Should I convert oz → lb → kg?
One step on this page matches chaining through lb; extra steps invite rounding drift if you round each hop.