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ounce (oz) → kilogram (kg)

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Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
oz=kg
0.01=0.000283
0.1=0.002835
1=0.02835
2=0.056699
3=0.085049
5=0.141748
10=0.283495
20=0.56699
50=1.417475
100=2.83495
1000=28.3495

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Brief explanation: ounce to kilogram

Kilogram is the base unit of mass in the metric system. Pound ≈ 0.453 kg, ounce = 28.35 g. Ton = 1000 kg. Weight and mass are often used interchangeably in everyday contexts. The metric system (kg, g, mg) is used globally. Pounds and ounces are common in the US and UK. For cooking, grams are precise; for body weight, kg or lb are standard.

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Common conversion examples: ounce to kilogram

Reference values for quick comparison. Use the converter above for any amount.

  • 1 ounce=0.0283 kilogram
  • 10 ounce=0.2835 kilogram
  • 100 ounce=2.835 kilogram

About the Units

ounce (oz)

Definition: An ounce (oz) is a unit of mass equal to 1/16 of a pound. One avoirdupois ounce equals approximately 28.35 grams. It is used for small weights in the imperial and US systems.
History: The ounce derives from the Roman uncia (one twelfth). The avoirdupois ounce became standard for commerce. Troy ounces are used for precious metals (1 troy oz ≈ 31.1 g).
Current use: Ounces are used for food portions, postal rates, and beverage sizes in the US. Baby weight and small package weights use ounces. The metric equivalent is grams.

kilogram (kg)

Definition: The kilogram (kg) is the base unit of mass in the International System of Units (SI). It is defined by the Planck constant since 2019. One kilogram is approximately the mass of one liter of water at 4°C.
History: The kilogram was originally defined in 1795 as the mass of one liter of water. From 1889 to 2019, it was defined by a platinum-iridium cylinder (the International Prototype Kilogram) stored in Paris. The current definition uses fundamental physical constants.
Current use: The kilogram is the global standard for mass. Body weight, food packaging, and cargo are measured in kilograms worldwide. Science and commerce rely on kilograms. The US still uses pounds for everyday weight.

Sources

Conversion factors and unit definitions follow international standards. For authoritative references, see: