Convert kilograms to ounces

A kilogram is 35.274 ounces. One avoirdupois ounce is exactly 0.028349523125 kg, so you divide the kilograms by that number: ounces = kilograms ÷ 0.028349523125[1]. Multiplying by 35.274 gives the same answer to four decimal places, which is enough for any kitchen or shipping scale.

Half a kilo is 17.637 oz, and a 2.5 kg bag of rice or flour holds 88.1849 oz. If a European recipe asks for 250 g of butter, that is 0.25 kg, or 8.8185 oz, a little more than two US sticks of 4 oz each.

Gold, silver and platinum use a heavier ounce, the troy ounce, and a kilogram holds 32.1507 of them[1]. Pick either one with the Ounce type switch under the fields, and the unit next to the result changes between oz and oz t. For the opposite direction, use the ounces to kilograms converter.

The kilogram is the base unit of mass in the International System of Units (SI). Its value is fixed through the Planck constant, set at exactly 6.626 070 15 × 10⁻³⁴ J·s[2]. Most of the world weighs groceries, luggage and people in kilograms, and in the UK and Australia food packs carry grams and kilograms too. Smaller amounts are easier in the grams to ounces converter.

The word ounce comes from the Latin uncia, a twelfth part[3]. Two ounces are still in use. The avoirdupois ounce is a sixteenth of a pound, 28.35 g, and it is the one on US groceries, parcels and sports gear. A pound therefore has exactly 16 ounces, which the pounds to ounces converter puts to use. The troy ounce is a twelfth of the troy pound and weighs 31.1034768 g[1].

A kilogram never comes out as a round number of ounces because the ounce is defined through the pound, and since 1959 the pound has been exactly 0.45359237 kg[1]. Dividing a kilogram by a sixteenth of that gives 35.27396.

A kilo bar of gold or silver holds 32.1507 troy ounces. The metal makes no difference, because the ounce measures mass alone. A troy ounce is heavier than an avoirdupois ounce, so fewer of them fit into the same kilogram.

Bars are often sold by the kilo, while the market price is quoted per ounce. The LBMA Gold Price is set twice a day, at 10:30 and 15:00 London time, in US dollars per troy ounce, and the LBMA Silver Price once a day at noon[4]. To turn a price per ounce into a price per kilo, multiply it by 32.1507. At $4,000 an ounce, a kilo of the same metal comes to $128,602.99 before any dealer premium.

The large bars traded in London are also weighed in ounces. A Good Delivery gold bar holds between 350 and 430 fine troy ounces, roughly 10.9 to 13.4 kg, and its weight is stated in steps of 0.025 oz[5]. National reserves quoted in tonnes go through the tons to ounces converter.