Ounce to Kilogram Converter
Weight · unit-converter
Convert Ounce to Kilogram with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Ounce (oz)
To: Kilogram (kg)
About Ounce
The avoirdupois ounce is 1/16 of an avoirdupois pound (about 28.35 g). Cooking and postal weights often use ounces.
About Kilogram
The kilogram is the SI base unit of mass (defined via fundamental constants). Everyday metric weights and science use kilograms and grams.
How to convert ounces to kilograms
1 ounce is equal to 0.028349523125 kilogram:
1 oz = (28.349523125 g ÷ 1000 g) kg = 0.028349523125 kg
Each ounce is defined as 28.349523125 g and each kilogram as 1000 g, so one oz equals 28.349523125 ÷ 1000 kg = 0.028349523125 kg.
Let w(oz) be the numeric value of the same mass measured in Ounce (oz), and w(kg) the value in Kilogram (kg). Then:
w(kg) = w(oz) × (28.349523125 / 1000)
Equivalently, divide by how many oz fit into one kg (grams per kg divided by grams per oz):
w(kg) = w(oz) ÷ 35.27396194958041
Or: kilogram = ounce ÷ 35.27396194958041
Examples
Example #1: Convert 20 oz to kilogram
20 oz = 20 oz × (28.349523125/1000) kg = 0.5669904625 kg
20 oz = 20 oz ÷ 35.27396194958041 = 0.5669904625 kg
Example #2: Convert 50 oz to kilogram
50 oz = 50 oz × (28.349523125/1000) kg = 1.4174761563 kg
50 oz = 50 oz ÷ 35.27396194958041 = 1.4174761563 kg
Summary
To convert Ounce to Kilogram, multiply the value in oz by the ratio of grams per oz divided by grams per kg. Equivalently: value_kg = value_oz × (28.349523125 / 1000). Numerically, 1 oz equals 0.028349523125 kg.
Relationship context
You are converting between imperial / UK (stone, long ton, pound, ounce) (Ounces) and metric (SI) (Kilograms). Metric mass is decimal from the gram; US and imperial masses use pounds and ounces with fixed definitions relative to the kilogram. The numeric factor used here is 2.834952e-2.
Conversion tables
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 0.1 | 0.0028349523 |
| 1 | 0.0283495231 |
| 2 | 0.0566990463 |
| 3 | 0.0850485694 |
| 4 | 0.1133980925 |
| 5 | 0.1417476156 |
| 6 | 0.1700971387 |
| 7 | 0.1984466619 |
| 8 | 0.226796185 |
| 9 | 0.2551457081 |
| Ounce (oz) | Kilogram (kg) |
|---|---|
| 10 | 0.2834952312 |
| 20 | 0.5669904625 |
| 30 | 0.8504856938 |
| 40 | 1.133980925 |
| 50 | 1.4174761563 |
| 60 | 1.7009713875 |
| 70 | 1.9844666187 |
| 80 | 2.26796185 |
| 90 | 2.5514570813 |
| 100 | 2.8349523125 |