Kilograms to ounces (kg to oz)

One kilogram is exactly 35.27396195 ounces. That is a definition rather than a measurement: the imperial and US customary units were fixed against metric ones by the 1959 international yard and pound agreement, so this factor does not drift and will not be revised.

Worked through: 1 kg x 35.2739619 = 35.274 oz.

Going the other way, one ounce is 0.0283495231 kilograms.

For mental arithmetic: Multiply by 35.3. For gold and silver, multiply by 32.15 instead.

The search behind most of this pair's demand is 'how many ounces in a kilo of gold', and that has a different answer. Precious metals are weighed in troy ounces of exactly 31.1034768 grams, about 10% heavier than the 28.35 g avoirdupois ounce this converter uses. So a one-kilogram gold bar is 35.27 ordinary ounces and 32.15 troy ounces, and the troy figure is the one a gold price is quoted against. Multiplying a per-ounce gold price by 35.27 overvalues the bar by nearly 10%. For anything else (food, postage, luggage) the ordinary ounce is right and the figure above applies.

Precision is worth matching to the input. A measurement given as 0.1 kg carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.