One ounce is about 0.02835 kg. Divide ounces by 35.274 to get kilograms.
How to use the Ounces to kg Converter
- Type the number of ounces into the Ounces field. Decimals such as 0.5 are fine.
- Read the answer in Kilograms – it updates as you type, with no button to press.
- To convert the other way, type into Kilograms and the ounces are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only oz ⇄ kg. Need a different unit? Use the general weight converter, where you can choose any “from” and “to” unit.
How it works
Both units measure weight, so they are always in the same ratio: one ounce equals 0.028349523 kilograms. The calculator multiplies the number of ounces you type by 0.028349523 to give kilograms, and when you type into the kilograms field it divides by the same factor to give ounces. Because the ratio never changes, doubling the ounces always doubles the kilograms. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert ounces to kilograms
- Write down the value in ounces, for example 1 oz.
- Multiply by the conversion factor 0.028349523 (because 1 ounce = 0.028349523 kg).
- 1 × 0.028349523 = 0.028349523 kg.
- To go back from kilograms to ounces, divide by 0.028349523 – or multiply by 35.273962.
oz to kg conversion table
| Ounces | Kilograms | Kilograms | Ounces |
|---|---|---|---|
| 1 oz | 0.028349523 kg | 1 kg | 35.273962 oz |
| 4 oz | 0.11339809 kg | 2 kg | 70.547924 oz |
| 8 oz | 0.22679619 kg | 5 kg | 176.36981 oz |
| 16 oz | 0.45359237 kg | 10 kg | 352.73962 oz |
| 32 oz | 0.90718474 kg | 20 kg | 705.47924 oz |
| 35.27 oz | 0.99988768 kg | 50 kg | 1,763.6981 oz |
| 50 oz | 1.4174762 kg | 100 kg | 3,527.3962 oz |
| 100 oz | 2.8349523 kg | 1,000 kg | 35,273.962 oz |
What is an ounce?
The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 g. It is used for food, postage and parcels. Do not confuse it with the fluid ounce (volume) or the troy ounce (precious metals).
What is a kilogram?
The kilogram is the SI base unit of mass. Since 2019 it has been defined through the Planck constant rather than a platinum-iridium cylinder kept near Paris.
Quick mental conversion
For a fast estimate, multiply ounces by about 0.028 to get kilograms; the error is about 1.2%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Confusing fluid ounces (volume) with ounces (weight), using troy ounces for food or regular ounces for gold, and mixing u.s. short tons, uk long tons and metric tonnes.
Formula
1 oz = 0.028349523 kg1 kg = 35.273962 ozkg = oz × 0.028349523Worked example
Inputs — Ounces: 1 oz.
Results — Kilograms = 0.02834952 kg.
Frequently asked questions
How many kg is 16 oz?
About 0.4536 kg.
How many ounces in a kilogram?
About 35.27.
How do I convert ounces to kilograms?
Multiply the number of ounces by 0.028349523. For example, 1 oz × 0.028349523 = 0.028349523 kg.
How do I convert kilograms back to ounces?
Divide by 0.028349523 (or multiply by 35.273962), or simply type the value into the kilograms field above.
What is 100 oz in kilograms?
100 oz = 2.8349523 kg.
What is 50 oz in kilograms?
50 oz = 1.4174762 kg.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between ounces and kilograms. To pick any weight unit, use the general weight converter linked under Related calculators.
What formula does the Ounces to kg Converter use?
1 oz = 0.028349523 kg.