Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.0283495 |
| g | Gram | 28.3495 |
| mg | Milligram | 28349.5 |
| t | Metric Ton | 0.0000283495 |
| lb | Pound | 0.0625 |
| st | Stone | 0.0044642843 |
The Ounce (oz) and the Kilogram (kg) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 oz = 0.0283495 kg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Ounce (oz) | Kilogram (kg) | Real-world context |
|---|---|---|
| 1 oz | 0.0283495 kg | letter envelope |
| 10 oz | 0.283495 kg | |
| 100 oz | 2.83495 kg | |
| 500 oz | 14.17475 kg | |
| 1000 oz | 28.3495 kg |
1 ounce (oz) equals exactly 0.0283495 kilograms (kg). Use the formula: oz × 0.0283495 = kg.
To convert ounces to kilograms, multiply your value in ounces by 0.0283495. For example, 5 oz × 0.0283495 = 0.1417475 kg.
100 ounces = 2.83495 kilograms. Calculation: 100 × 0.0283495 = 2.83495.
To convert kilograms back to ounces, divide by 0.0283495 (or multiply by 35.2739907). Example: 10 kg ÷ 0.0283495 = 352.7399 oz.
Yes. This converter uses the internationally recognised exact conversion factor: 1 oz = 0.0283495 kg. All calculations are performed in your browser with no rounding until display.
10 ounces = 0.283495 kilograms. Simply multiply by 0.0283495.
Converting ounces to kilograms is commonly needed for everyday tasks like cooking recipes, body weight tracking, shopping internationally, or shipping parcels where one system uses oz and another uses kg.
The avoirdupois ounce (oz) equals exactly 28.349523125 grams or 1/16 of an avoirdupois pound. It is widely used in the US and UK for food portions, product packaging, and everyday measurements. Note that the troy ounce (31.1035 g), used for precious metals like gold and silver, is a different and heavier unit than the avoirdupois ounce.
The kilogram (kg) is the SI base unit of mass — one of seven fundamental units in the International System. Equal to exactly 1,000 grams, it is the foundation of weight measurement in science, medicine, engineering, and commerce worldwide. Uniquely among SI base units, the kilogram is named with a metric prefix ("kilo-" = 1,000).
The word "ounce" derives from Latin uncia (a twelfth), originally 1/12 of the Roman pound. The avoirdupois ounce developed in medieval England specifically for the wool trade, creating a 16-ounce pound distinct from the Troy 12-ounce pound. The British Imperial system codified the ounce in 1824. The modern exact definition (28.349523125 g) was set by the 1959 International Yard and Pound Agreement.
Interesting fact: A troy ounce (31.1 g) used for gold is heavier than an avoirdupois ounce (28.35 g) used for food — so an "ounce" of gold contains more metal than an "ounce" of flour. A standard large hen's egg weighs approximately 56–63 grams (about 2 oz).
Defined in 1795 by the French Revolutionary government as the mass of one cubic decimetre of distilled water at 4 °C. A platinum prototype (the Kilogramme des Archives) was created in 1799. From 1889 until 2019, the world's mass standard was the International Prototype Kilogram — a platinum-iridium cylinder stored in Sèvres, France. In 2019, the kilogram was redefined in terms of Planck's constant (h = 6.626 070 15 × 10⁻³⁴ J·s), eliminating the need for a physical artifact.
Interesting fact: The IPK and its official copies drifted apart by up to 50 micrograms over 130 years, motivating the 2019 redefinition. The kilogram is the only SI unit whose name starts with a prefix.