Which is heavier, an ounce or a kilogram?

A kilogram is quite heavier than an ounce.

A kilogram (kg) is a measuring unit termed a metric unit of mass and is part of the metric system of units. At the same time, one kilogram is equal to approximately 2.20462 pounds, or 1000 grams.

An ounce (oz) comes under the imperial unit of weight, is commonly used in the United States, and is part of the imperial system of units. One ounce is equal to the range of 28.35 grams.

So, a kilogram is considerably heavier than an ounce, with 1 kilogram being equivalent to approximately 35.27 ounces.