A kilogram is a measure of mass. To convert from one to the other you will need to know what material is being converted and what temperature it is at.

There is no universal conversion from gallons to kilograms. We need the density of the substance to convert. Gallons are a measure of volume; kilogram is a measure of mass. yahoo euchre games

If You Knew The Weight Of The Gallon You Could Convert Said Item,... Converting Gallons to kilograms, Gallons to Pounds. [Archive ... How many gallons of milk in a kilogram? The kilogram is a unit of mass and the gallon is an obsolete, non SI, unit of volume.

Ounces of weight are not the same as ounces of volume. So the conversion you made wont be correct. I know its confusing, with them having the same name and all. It depends on the substance.