Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Ounces to Kilograms
Convert oz to kg instantly, then review the formula, assumptions, and rounding guidance.
Weight & massInstant result
Decimals
Formula result = input × 0.028349523125 ÷ 1. 1 oz = 0.0283 kg
Common examples
One value, several units
Kilograms0.0283 kg
Grams28.3495 g
Milligrams28,349.5231 mg
Metric tonnes0 t
Pounds0.0625 lb
Stone0.0045 st
Conversion table
| oz | kg |
|---|---|
| 1 oz | 0.0283 kg |
| 2 oz | 0.0567 kg |
| 5 oz | 0.1417 kg |
| 10 oz | 0.2835 kg |
| 25 oz | 0.7087 kg |
| 50 oz | 1.4175 kg |
| 100 oz | 2.835 kg |
Conversion chart
1 oz0.0283 kg
5 oz0.1417 kg
10 oz0.2835 kg
25 oz0.7087 kg
50 oz1.4175 kg
Worked example
1 kilogram equals 2.20462 pounds.
Unit definition
Ounces (oz) One ounces equals 0.028349523125 kilogram.
Unit history
Ounces is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert oz to kilogram.
3. Convert the base value to kg and apply your display precision.
Understand the result before using it
Ounces to Kilograms converts a value measured in Ounces (oz) into the equivalent value in Kilograms (kg). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.028349523125 ÷ 1
Assumptions
- Ounces and Kilograms represent the same weight & mass quantity.
- The input is expressed in oz; the output is expressed in kg.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 oz = 0.028349523125 kg. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a oz measurement in a document that expects kg.
- Compare a ounces value with a value reported in kilograms.
- Check the oz-to-kg arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Everyday language often says weight, but these units represent mass. Force requires a local gravitational acceleration.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Ounces to Kilograms?
result = input × 0.028349523125 ÷ 1 Using the displayed relationship, 1 oz equals 0.028349523125 kg.
How many Kilograms are in one Ounces?
One Ounces is 0.028349523125 Kilograms. The displayed digits may be rounded.
Can I reverse the oz to kg conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts kg back to oz.
Is the Ounces to Kilograms result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.