How many gallons is 2.78kg?

Answer 1

A gallon is a unit of capacity. A kilogram is a unit of mass. The two units are therefore incompatible.

Answer 2

To convert kilograms to gallons, you need to know the density of the substance being measured. Once you have the density, you can use the formula: volume (gallons) = mass (kg) / density (kg/gallon). Without the density of the substance, it is not possible to provide an accurate answer.