Convert Ounces (oz) to Kilograms (kg)
1 ounce equals 0.0283495 kilograms.
Ounce to Kilogram Converter
How to Convert Ounce to Kilogram
1 ounce = 0.0283495 kilograms exact
Kilogram = Ounce × 0.0283495
Example: 1 oz × 0.0283495 = 0.0283495 kg
Reverse Conversion
To convert kilograms back to ounces:
- Remember, 1 kilogram equals 35.274 ounces.
- To convert 0.0283495 kg to oz, multiply
0.0283495 x 35.274, resulting in1 oz.
exact This conversion factor is exact by international definition.
Common Ounce to Kilogram Conversions
| Ounce | Kilogram | Actions |
|---|---|---|
| 32 ounces | 0.907185 kilograms | |
| 64 ounces | 1.81437 kilograms | |
| 100 ounces | 2.83495 kilograms | |
| 500 ounces | 14.1748 kilograms |
Ounces to kilograms Conversion Table
Reference table with common ounces to kilograms conversions. All values calculated with high precision.
Ounces to Kilograms Table
100 to 10000000
Kilograms to Ounces Table
0.0001 to 12
Kilograms to Ounces Table
1 to 100000
Definition of Ounce
- Definition
- The ounce (oz) is a unit of mass equal to one sixteenth of a pound in the avoirdupois system. It is commonly used for food portions, postal items, and small packages.
The ounce remains prevalent in countries using imperial or US customary units. - Exact factor
- 1 oz = 28.349523125 g = 0.0625 lb
- Examples
- • 16 oz = 1 lb
• 8 oz ≈ 226.8 g
Definition of Kilogram
- Definition
- The kilogram (kg) is the SI base unit of mass. Since 2019, it is defined by fixing the numerical value of the Planck constant, ensuring stability independent of physical artifacts.
The kilogram is universally used in science, engineering, medicine, commerce, and daily life, forming the reference point for all metric and many non-metric mass units. - Exact factor
- Base unit: 1 kg = 1000 g = 2.2046226218 lb
- Examples
- • 70 kg ≈ 154.32 lb
• 80 kg ≈ 12 st 8.37 lb
About the Ounce
Facts & Uses
- Avoirdupois ounce equals 1/16 of a pound = exactly 28.349523125 grams (derived from the 1959 Agreement on the pound).
- Standard unit for food portions (deli meats, cheese), postal letter weights (US 1st-class mail), and beverage servings (a 12 oz soda can).
- Common in cooking for both dry and fluid ingredients in the US — though the fluid ounce (volume) and ounce (mass) are unrelated and frequently confused.
- Used in boxing glove weights (8 oz / 10 oz / 12 oz), archery (arrow weight), and jewelry for non-precious metal items.
Curiosities
- The troy ounce (used for gold, silver, platinum) is heavier: 1 troy oz ≈ 31.1035 g, vs. 28.35 g for avoirdupois — a ~10% difference that matters at bullion prices.
- The symbol "oz" derives from the medieval Italian onza, in turn from the Latin uncia meaning "a twelfth part" (originally 1/12 of a Roman pound).
- 16 oz (1 lb) of feathers and 16 oz (1 lb) of gold weigh the same in avoirdupois — but the gold would actually weigh more if measured in troy ounces, since 1 lb troy = 12 troy oz only.
- 1 oz ≈ 28.35 g ≈ 437.5 grains.
Sources
About the Kilogram
Facts & Uses
- SI base unit of mass — the only base unit redefined in 2019 (26th CGPM) by fixing the Planck constant at exactly 6.62607015 × 10⁻³⁴ J·s, replacing the 130-year-old physical artifact.
- Universal reference for science, medicine (drug dosage, body weight), commerce (food, freight), and engineering (mechanical loads, structural design).
- Used in nutrition labels, fitness (BMI, weight loss), and international shipping where customs declarations require metric mass.
- Subdivisions: gram (cooking, lab), milligram (pharmacy, dosing), microgram (toxicology); multiples: tonne (industry, freight).
Curiosities
- Until 20 May 2019, the kilogram was defined as the mass of the International Prototype Kilogram (IPK), a platinum-iridium cylinder kept in a vault near Paris since 1889.
- Comparisons with sister copies showed the IPK was drifting by ~50 µg per century — enough to motivate the redefinition via a fundamental constant.
- The kilogram is the only SI base unit whose name still contains a metric prefix ("kilo"), a historical quirk inherited from the 1795 French metric system.
- Approximate equivalents: 1 kg ≈ 2.2046 lb ≈ 35.274 oz ≈ 0.157 stone.
Sources
Frequently Asked Questions
How many kilograms are in one ounce?
One ounce equals 0.0283495 kilograms. To convert, multiply the ounce value by 0.0283495. For the reverse, divide the kilogram value by 0.0283495 (or multiply by 35.274).
What is 0.1 ounces in kilograms?
0.1 ounces = 0.002835 kilograms. This is one of the most commonly searched conversions for this pair.
How precise is the ounce-to-kilogram conversion?
The factor 0.0283495 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Convert Ounce to Kilogram: Worked Examples
These examples demonstrate how to convert ounces to kilograms using the conversion factor. The values shown are based on commonly searched conversions.
Example 1:
Convert 32 oz to kilograms.
Solution:
We know that 1 oz = 0.02835 kg.
To convert 32 oz to kilograms, multiply 32 by 0.02835:
32 oz = 32 × 0.02835 kg
32 oz = 0.9072 kg
Therefore, 32 ounces is equal to 0.9072 kilograms.
Example 2:
Convert 16 oz to kilograms.
Solution:
We know that 1 oz = 0.02835 kg.
To convert 16 oz to kilograms, multiply 16 by 0.02835:
16 oz = 16 × 0.02835 kg
16 oz = 0.4536 kg
Therefore, 16 ounces is equal to 0.4536 kilograms.
Example 3:
Convert 12 oz to kilograms.
Solution:
We know that 1 oz = 0.02835 kg.
To convert 12 oz to kilograms, multiply 12 by 0.02835:
12 oz = 12 × 0.02835 kg
12 oz = 0.3402 kg
Therefore, 12 ounces is equal to 0.3402 kilograms.
More Ounce to Kilogram Conversions:
8 oz to kilograms: 8 × 0.02835 = 0.2268 kg
1 oz to kilograms: 1 × 0.02835 = 0.02835 kg
72 oz to kilograms: 72 × 0.02835 = 2.041 kg
21 oz to kilograms: 21 × 0.02835 = 0.5953 kg
18 oz to kilograms: 18 × 0.02835 = 0.5103 kg
64 oz to kilograms: 64 × 0.02835 = 1.814 kg
Conversion Formula:
For any value in ounces, use this formula:
Kilograms = Ounces × 0.02835
Looking for the reverse? Convert Kilogram to Ounce
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