Ounces to Kilograms (oz to kg) Converter and Formula
1 ounce equals 0.02834952 kilograms — multiply the number of ounces by 0.02834952 to convert. Because there are 1000 grams in a kilogram and one avoirdupois ounce is 28.349523 grams, an ounce is a small fraction of a kilogram, which is why the factor is well under one.
The formula
To convert ounces to kilograms, multiply by 0.02834952:
kg = oz × 0.02834952
For example, 16 oz (one pound) is 16 × 0.02834952 = 0.45359237 kg. To reverse it, divide by 0.02834952 (or multiply by 35.273962).
Conversion table
| Ounces (oz) | Kilograms (kg) |
|---|---|
| 1 | 0.0283495 |
| 2 | 0.0566990 |
| 5 | 0.1417476 |
| 10 | 0.2834952 |
| 25 | 0.7087381 |
| 50 | 1.4174762 |
| 100 | 2.8349523 |
| 250 | 7.0873808 |
| 500 | 14.174762 |
| 1000 | 28.349523 |
How to convert online
- Type the number of ounces into the first box.
- Read the equivalent value in kilograms instantly in the second box.
- Or enter a kilogram value to convert back to ounces — it works both ways.
Use the Ounce to Kilogram Converter — free and instant in your browser.
Where this conversion is used
Converting ounces to kilograms is common in shipping and logistics, where parcel weights straddle imperial and metric systems, and in fitness and nutrition when scaling US portion sizes to metric body-weight figures. It also appears in international trade paperwork and science labs that standardise on SI units. For quick orientation, 16 oz (one pound) is about 0.454 kg, a 32 oz package is roughly 0.907 kg, and a bulky 160 oz item comes in near 4.54 kg. Because a kilogram is a fairly large unit, ounce-to-kilogram results are usually small decimals, so keeping several decimal places matters when you are totalling many items or filling in a customs declaration — the converter below preserves that precision automatically.
FAQ
How many kilograms are in an ounce?
One ounce equals 0.02834952 kilograms. Multiply the ounce value by 0.02834952, so 10 oz = 0.2834952 kg.
What is the formula to convert ounces to kilograms?
kg = oz × 0.02834952. For example, 50 oz = 1.4174762 kg and 100 oz = 2.8349523 kg.
How do I convert kilograms back to ounces?
Divide the kilogram value by 0.02834952, or multiply by 35.273962. So 0.2834952 kg = 10 oz.
Is the conversion exact?
Yes. It derives from the exact avoirdupois ounce (28.349523125 g), so 1 oz = 0.028349523125 kg precisely.
Related converters
- Kilogram to Ounce Converter
- Ounce to Gram Converter
- Ounce to Milligram Converter
- Ounce to Pound Converter
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