1 oz = 0.0283495 kg
1 ounce equals 0.0283495 kilograms. To convert ounces to kilograms, multiply the ounce value by 0.0283495. For quick reference: 1 oz = 0.0283495 kg, 5 oz = 0.141748 kg, 10 oz = 0.283495 kg, 100 oz = 2.83495 kg.
Kilograms = Ounces × 0.0283495Start with your value in ounces.
Multiply the ounce value by 0.0283495. This is the exact conversion factor from ounces to kilograms.
The product is your value in kilograms. For example, 5 oz × 0.0283495 = 0.141748 kg.
The exact factor from ounces to kilograms is 0.0283495.
Kilograms = Ounces × 0.0283495
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Ounces (oz) | Kilograms (kg) |
|---|---|
| 0.1 oz | 0.002835 kg |
| 0.25 oz | 0.0070874 kg |
| 0.5 oz | 0.014175 kg |
| 1 oz | 0.02835 kg |
| 1.5 oz | 0.042524 kg |
| 2 oz | 0.056699 kg |
| 2.5 oz | 0.070874 kg |
| 3 oz | 0.085049 kg |
| 4 oz | 0.1134 kg |
| 5 oz | 0.14175 kg |
| 6 oz | 0.1701 kg |
| 7 oz | 0.19845 kg |
| 8 oz | 0.2268 kg |
| 9 oz | 0.25515 kg |
| 10 oz | 0.2835 kg |
| 12 oz | 0.34019 kg |
| 15 oz | 0.42524 kg |
| 18 oz | 0.51029 kg |
| 20 oz | 0.56699 kg |
| 25 oz | 0.70874 kg |
| 30 oz | 0.85049 kg |
| 35 oz | 0.99223 kg |
| 40 oz | 1.134 kg |
| 45 oz | 1.2757 kg |
| 50 oz | 1.4175 kg |
| 60 oz | 1.701 kg |
| 70 oz | 1.9845 kg |
| 75 oz | 2.1262 kg |
| 80 oz | 2.268 kg |
| 90 oz | 2.5515 kg |
| 100 oz | 2.835 kg |
| 120 oz | 3.4019 kg |
| 125 oz | 3.5437 kg |
| 150 oz | 4.2524 kg |
| 175 oz | 4.9612 kg |
| 180 oz | 5.1029 kg |
| 200 oz | 5.6699 kg |
| 225 oz | 6.3786 kg |
| 250 oz | 7.0874 kg |
| 275 oz | 7.7961 kg |
| 300 oz | 8.5049 kg |
| 350 oz | 9.9223 kg |
| 400 oz | 11.34 kg |
| 450 oz | 12.757 kg |
| 500 oz | 14.175 kg |
| 600 oz | 17.01 kg |
| 750 oz | 21.262 kg |
| 1000 oz | 28.35 kg |
| 2000 oz | 56.699 kg |
| 5000 oz | 141.75 kg |
A slice of bread is about 1 oz. A baseball weighs around 5 oz. In kilograms, that gives you: 1 oz = 0.0283495 kg, 10 oz = 0.283495 kg, 100 oz = 2.83495 kg.
The avoirdupois ounce (oz) is a unit of mass in the imperial and US customary systems, defined as exactly 28.349523125 grams (1/16 of an avoirdupois pound). It is the standard small-mass unit in the United States for food packaging, recipes, and postal weights. Do not confuse it with the troy ounce (used for precious metals, 31.1035 g) or the fluid ounce (a volume).
The kilogram (kg) is the SI base unit of mass. Since the 2019 redefinition it is defined by fixing the Planck constant to exactly 6.62607015 × 10⁻³⁴ J·s, replacing the old International Prototype Kilogram artifact. In everyday use, the kilogram is the global standard for body weight, groceries, and engineering specifications.