Ounce to Kg Converter

How to Convert Ounces to Kilograms

To convert ounces to kilograms, multiply the number of ounces by 0.0283495231. This factor comes from the exact definition of the international avoirdupois ounce, which equals exactly 28.349523125 grams, or 0.028349523125 kilograms.

The formula is:

kg = oz x 0.0283495231

For example, to convert 16 ounces to kilograms: 16 x 0.0283495231 = 0.4536 kg. This result is also exactly one avoirdupois pound (0.45359237 kg), because there are 16 ounces in one pound.

Worked Example

Convert 16 oz to kg:

1. Start with 16 oz
2. Multiply by the conversion factor: 16 x 0.0283495231
3. Result: 0.4536 kg (to 4 decimal places)
4. In grams: 16 x 28.3495231 = 453.59 g (to 2 decimal places)

This matches the calculator's default output with 16 oz entered.

Avoirdupois vs Troy Ounces

There are two common types of ounce in use today:

• Avoirdupois ounce: 28.3495 g (0.028350 kg). Used for food, body weight, postal packages, and everyday goods in countries that use imperial measurements.
• Troy ounce: 31.1035 g (0.031104 kg). Used exclusively for precious metals such as gold, silver, and platinum. A troy ounce is about 10% heavier than an avoirdupois ounce.

This converter uses the avoirdupois ounce. If you are converting a weight from a precious metals listing, use a troy ounce converter instead.

Quick Conversion Reference

Related Converters

• Essential Calculators: all unit converters and tools.
• Kg to Ounce Converter: convert kilograms back to ounces.
• Grams to Ounces Calculator: convert grams to oz.
• Grams to Pounds Converter: convert grams to pounds.
• Pounds to Grams Converter: convert pounds to grams.
• Metric to Imperial Converter: a full metric-to-imperial weight and length tool.

Sources and method: International Yard and Pound Agreement (1959), which defined the avoirdupois pound as exactly 0.45359237 kg, making the ounce (1/16 lb) exactly 0.028349523125 kg. National Institute of Standards and Technology (NIST) Special Publication 811.

This converter uses the avoirdupois ounce. Troy ounces (used for precious metals) are approximately 10% heavier at 31.1035 g each. For everyday goods, food packaging, and postal weights, the avoirdupois ounce applies.