How to Convert Ounces to Kilograms (oz to kg)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert ounces into kilograms by hand, with examples and a quick-reference table.
The conversion
To convert ounces to kilograms, multiply the value by 0.0283495231. To go the other way, divide by the same number (or multiply by 35.2739619496). For a quick estimate, multiply by about 0.028.
Kilograms = ounces × 0.0283495231
Worked examples
- 3 oz = 0.085049 kg
- 12.5 oz = 0.354369 kg
- 75 oz = 2.1262 kg
Ounces to Kilograms table
| Ounces | Kilograms |
|---|---|
| 1 oz | 0.02835 kg |
| 2 oz | 0.056699 kg |
| 5 oz | 0.141748 kg |
| 10 oz | 0.283495 kg |
| 20 oz | 0.56699 kg |
| 25 oz | 0.708738 kg |
| 50 oz | 1.4175 kg |
| 100 oz | 2.835 kg |
| 250 oz | 7.0874 kg |
| 500 oz | 14.1748 kg |
| 1,000 oz | 28.3495 kg |
Common questions
Is oz to kg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilograms to Ounces converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Ounces to Kilograms Converter or browse all weight converters.
Run your own numbers: Ounces to Kilograms Converter