Convert Ounces to Kilograms
1 ounce (oz) equals 0.02834952313 kilograms (kg).
1 oz = 0.02834952313 kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ounce to kilogram converter to paste a column from Excel.
How to Convert Ounce to Kilogram
- 1 oz = 0.02834952313 kg
- 1 kg = 35.27396195 oz
- Example: convert 15 oz to kg: 15 oz = 15 × 0.02834952313 kg = 0.4252428469 kg
Reference conditions. oz: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
kg = oz × 0.028349523125
or kg = oz ÷ 35.27396194958
Derivation from SI units:
- 1 oz = 1/16 lb = 28.349523125 g (exact)
- SI base unit, fixed by the Planck constant h = 6.626 070 15 × 10⁻³⁴ J·s
Both units are defined exactly, so the factor is exact. Ounce definition: ounce; Kilogram definition: kilogram.
Worked examples
- A reading of 4 oz converts to 0.1133980925 kg.
4 oz × 0.02834952313 = 0.1133980925 kg - A value of 12 oz is 0.3401942775 kg.
12 oz × 0.02834952313 = 0.3401942775 kg
Ounce to Kilogram conversion table
| Ounces (oz) | Kilograms (kg) |
|---|---|
| 0.25 oz | 0.007087380781 kg |
| 0.5 oz | 0.01417476156 kg |
| 1 oz | 0.02834952313 kg |
| 2 oz | 0.05669904625 kg |
| 3 oz | 0.08504856938 kg |
| 4 oz | 0.1133980925 kg |
| 5 oz | 0.1417476156 kg |
| 6 oz | 0.1700971388 kg |
| 8 oz | 0.226796185 kg |
| 10 oz | 0.2834952313 kg |
| 12 oz | 0.3401942775 kg |
| 16 oz | 0.45359237 kg |
| 20 oz | 0.5669904625 kg |
| 24 oz | 0.680388555 kg |
| 32 oz | 0.90718474 kg |
| 64 oz | 1.81436948 kg |
Where it's used
Ounces are used for food and parcel weights in the US, while kilograms appear in body weight and food packaging. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Ounce to other weight and mass units
| Conversion | 1 oz equals |
|---|---|
| ounce to kilogram | 0.02834952313 kg |
| ounce to gram | 28.34952313 g |
| ounce to milligram | 28349.52313 mg |
| ounce to microgram | 28349523.13 µg |
| ounce to metric ton | 0.00002834952313 t |
| ounce to pound | 0.0625 lb |
| ounce to stone | 0.004464285714 st |
| ounce to short ton | 0.00003125 ton (US) |
| ounce to long ton | 0.00002790178571 ton (UK) |
| ounce to grain | 437.5 gr |
| ounce to troy ounce | 0.9114583333 oz t |
| ounce to carat | 141.7476156 ct |
Frequently asked questions
How many kilograms are in 1 ounce?
1 oz = 0.02834952313 kg.
How do I convert ounces to kilograms?
Multiply the value in oz by 0.02834952313, or divide it by 35.27396195. For example, 15 oz × 0.02834952313 = 0.4252428469 kg.
Is the oz to kg conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois) (oz)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Ounces to Kilograms. Retrieved October 17, 2026, from https://scientificconverters.com/mass/ounces-to-kilograms/
IEEE
Scientific Converters, "Convert Ounces to Kilograms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/ounces-to-kilograms/