Ounces to Kilograms Converter (oz to kg)
1 oz = 0.028349523125 kg exactly. Convert ounces to kilograms for shipping forms, sports rules and bulk packs, with oz to kg and kg to oz charts.
Kilogram (kg) = Ounce (oz) × 0.028349523125
Ounce (oz): The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 grams. It is the everyday ounce for food and parcels in the US; precious metals use the heavier troy ounce.
Kilogram (kg): The kilogram is the SI base unit of mass. Since 2019 it has been defined by fixing the value of the Planck constant, replacing the platinum-iridium prototype kept near Paris.
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 1 | 0.028349523125 |
| 5 | 0.141747615625 |
| 10 | 0.28349523125 |
| 25 | 0.708738078125 |
| 50 | 1.41747615625 |
| 100 | 2.8349523125 |
Ounces rarely need converting straight to kilograms in the kitchen, where grams are handier, but the direct step matters on international shipping labels, customs declarations and courier systems that ask for kilograms, and whenever a US product or sports specification in ounces has to be compared with a metric one.
An ounce is exactly 0.028349523125 kg, a sixteenth of the 0.45359237 kg pound. Because the results are small decimals, the charts show four decimal places; for light items the grams to ounces converter gives easier numbers. To check an answer in your head, remember that 16 oz is one pound and a kilogram is a little over 2.2 lb.
How to use this tool
- Type a value in the Ounce box to see it in kilograms, or type in the Kilogram box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Weight & Mass converter.
Formula
Kilogram (kg) = Ounce (oz) × 0.028349523125
Ounce (oz) = Kilogram (kg) × 35.2739619496
Both factors come from exact definitions: 1 kilogram = 35.2739619496 ounces and 1 ounce = 0.028349523125 kilograms (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
64 oz × 0.028349523125 ≈ 1.81437 kg
0.5 kg × 35.2739619496 ≈ 17.637 oz
Ounce to Kilogram chart
Common values from ounces to kilograms, rounded to four decimal places.
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 1 | 0.0283 |
| 2 | 0.0567 |
| 4 | 0.1134 |
| 6 | 0.1701 |
| 8 | 0.2268 |
| 10 | 0.2835 |
| 12 | 0.3402 |
| 16 | 0.4536 |
| 20 | 0.567 |
| 24 | 0.6804 |
| 32 | 0.9072 |
| 35 | 0.9922 |
| 40 | 1.134 |
| 48 | 1.3608 |
| 50 | 1.4175 |
| 64 | 1.8144 |
| 70 | 1.9845 |
| 80 | 2.268 |
| 96 | 2.7216 |
| 100 | 2.835 |
| 128 | 3.6287 |
| 160 | 4.5359 |
| 200 | 5.6699 |
| 320 | 9.0718 |
Kilogram to Ounce chart
The reverse direction for values people often look up.
| Kilogram (kg) | Ounce (oz) |
|---|---|
| 0.1 | 3.5274 |
| 0.25 | 8.8185 |
| 0.5 | 17.637 |
| 0.75 | 26.4555 |
| 1 | 35.274 |
| 1.5 | 52.9109 |
| 2 | 70.5479 |
| 2.5 | 88.1849 |
| 3 | 105.8219 |
| 5 | 176.3698 |
| 10 | 352.7396 |
| 20 | 705.4792 |
Weights set in ounces by rules and services
| Item | Ounce (oz) | Kilogram (kg) |
|---|---|---|
| Golf ball, maximum (Rules of Golf) | 1.62 | 0.0459 |
| Baseball, maximum (MLB rules) | 5.25 | 0.1488 |
| Cricket ball, men's maximum (Laws of Cricket) | 5.75 | 0.163 |
| Ice hockey puck, maximum (NHL) | 6 | 0.1701 |
| NFL football, maximum | 15 | 0.4252 |
| USPS First-Class Package International, limit | 64 | 1.8144 |
Quick mental estimate
Divide the ounces by 35 for a quick figure: 70 oz → about 2 kg. A kilogram is about 35.27 oz, so the shortcut reads about 0.8% high; dividing by 35.3 instead brings the error under 0.1%.
Use the converter or the charts when the exact figure matters.
The two units
Ounce (oz): The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 grams. It is the everyday ounce for food and parcels in the US; precious metals use the heavier troy ounce.
Kilogram (kg): The kilogram is the SI base unit of mass. Since 2019 it has been defined by fixing the value of the Planck constant, replacing the platinum-iridium prototype kept near Paris.
Frequently asked questions
How do I enter an ounce weight on a form that asks for kilograms?
Divide the ounces by 35.274, or type them into the converter above. A 12 oz item is about 0.34 kg, and a 40 oz package is about 1.13 kg. Check whether the form wants the net weight of the goods or the gross weight including packing.
Does this work for an ounce of gold or silver?
No. Precious metals use the troy ounce, which is exactly 31.1034768 g, or 0.0311034768 kg, about 9.7% more than the ounce used here. It takes about 32.15 troy ounces to make up a kilogram.
How many kilograms is 16 oz?
Exactly 0.45359237 kg, because 16 ounces make one pound. Half that, 8 oz, is 0.226796185 kg, and a quarter pound, 4 oz, is 0.1133980925 kg.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/ounce-to-kilogram-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Ounces to Kilograms Converter (oz to kg). https://kakao.mobile/tools/ounce-to-kilogram-converter/
“Ounces to Kilograms Converter (oz to kg).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/ounce-to-kilogram-converter/.
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