There is no International System of Units (SI) base unit for weight.
Weight is a force, due to gravity, so is measured in newtons, which is termed an SI derived unit.
Weight and mass are often used interchangeably in everyday language because they are related properties of matter, but they are different properties. So, in everyday usage, we often say that things are 'weighed' in kilograms.
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The basic metric unit for weight is the newton.
In the metric system, 0.35 ounces is equal to 9.92233 grams. In kilograms, this would be equal to 0.00992233 kilograms. The kilogram is the basic unit of weight in the metric system.
The basic unit of length in the metric system is the meter.
newton
Weight is the mutual gravitational force between the earth and any object on it.The basic unit of force is the Newton .