How many kilograms is 1 ounce?

1 avoirdupois ounce equals exactly 0.0283495231 kilograms (28.3495231 grams). This is defined by international agreement and is the standard ounce used for everyday goods.

What type of ounce does this converter use?

This tool uses the avoirdupois ounce, the most common ounce used in the United States and many other countries for measuring food, parcels, and general goods. It is different from the troy ounce (31.1035 g) used for precious metals.

How do I convert kg back to oz?

To go from kilograms to ounces, divide by 0.0283495231 or multiply by 35.27396195. For example, 1 kg ≈ 35.274 oz.

Is this conversion exact?

Yes. The avoirdupois pound is defined as exactly 453.59237 grams, making 1 oz = 453.59237 / 16 = 28.349523125 grams = 0.028349523125 kg. The results displayed are rounded to six decimal places for readability.

What is the difference between oz and fl oz?

The ounce (oz) used here is a unit of mass. The fluid ounce (fl oz) is a unit of volume used for liquids. They are not directly interchangeable — use this tool only for mass conversions.

Ounces to Kilograms Converter

Type a value in ounces and instantly see the exact equivalent in kilograms.

Enter Value in Ounces

Ounces (oz)

Result in Kilograms

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Quick Reference Table

Ounces (oz)	Kilograms (kg)

1 oz = 0.028350 kg | Factor: 0.0283495231

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Summary

This tool converts ounces (oz) to kilograms (kg) using the exact conversion factor of 1 oz = 0.0283495231 kg, defined by the International Yard and Pound Agreement. It handles any positive decimal input and shows results rounded to six significant figures for everyday precision. Both the avoirdupois ounce and the corresponding kilogram value are displayed alongside a quick-reference conversion table.

How it works

Enter the number of ounces in the input field.
The tool multiplies your value by 0.0283495231 kg per oz.
The result in kilograms is shown instantly below the input.
A reference table for common ounce values updates alongside your result.
Click "Copy Result" to copy the kg value to your clipboard.

Use cases

Convert recipe ingredient weights from US customary to metric.
Check parcel or luggage weight when shipping internationally.
Calculate postal rates for envelopes and small parcels.
Verify nutritional label weights across different unit systems.
Help students with unit conversion homework.
Compare product weights from US and European specifications.

Frequently Asked Questions

Last updated: 2026-06-04 · Reviewed by Nham Vu