Ounces to Kilograms Converter

About the oz to kg calculation

One ounce is exactly 0.02835 kilograms, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Common in US recipes and for postal weights. Not the same as a fluid ounce. The SI base unit of mass, and how bodyweight is quoted in most of the world.

Formula

kg = oz × 0.02835

1 oz = 0.02835 kg
1 kg = 35.274 oz

Worked example

To convert 16 oz, multiply by 0.02835: 16 × 0.02835 = 0.453592 kg.

Frequently asked questions

How many kilograms are in a ounce?

There are 0.02835 kilograms in one ounce. To convert any amount, multiply the number of ounces by 0.02835.

How do I convert kilograms back to ounces?

Divide instead of multiplying, or equivalently multiply by 35.274. One kilogram is 35.274 ounces.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between ounces and kilograms is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Ounces: common in US recipes and for postal weights. Not the same as a fluid ounce. Kilograms: the SI base unit of mass, and how bodyweight is quoted in most of the world.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units