Convert kilograms to US gallons and gallons to kg using liquid density. 1 US gallon of water weighs about 3.79 kg, gasoline is closer to 2.8 kg.
Assumes a US liquid gallon (3.785411784 liters) and one constant density for the whole amount. Water is 1 kg per liter, milk is about 1.03, gasoline is about 0.74, and diesel is about 0.85. Use a custom value when your product label or spec sheet gives you a better density. A UK imperial gallon (4.54609 liters) is not used here.
US gallons
0.264172 gal
Density used
1 kg/L (3.7854 kg/US gal)
Preset
Water
Calculation
gallons = kg / density (kg/US gal)
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