Gal To Kg
Convert gallons (gal) to kilograms (kg) for water, milk, oil, gasoline, and more. Free volume-to-weight converter with density selection for accurate results.
About This Calculator
The Gal To Kg converter is a free online tool that converts volume measurements in US gallons to mass in kilograms. Whether you are cooking, conducting scientific experiments, calculating fuel weight for logistics, or working with industrial materials, this converter accounts for the density of the substance to give accurate weight results.
The conversion formula is straightforward: kg = gal × 3.78541 × density. The factor 3.78541 converts US gallons to liters, and the density (kg per liter) converts volume to mass. Water has a density of approximately 1 kg/L, so 1 US gallon of water weighs about 3.79 kg. Different substances have different densities — cooking oil is lighter (0.88 kg/L) while honey is heavier (1.42 kg/L). The calculator includes presets for common substances like milk, gasoline, diesel, salt water, and corn syrup, or you can enter a custom density for any other liquid.
Common use cases include converting US recipe volumes to weight for cooking and baking, calculating fuel or cargo weight in shipping and logistics, determining the mass of liquids for industrial mixing, and performing science experiments where mass must be derived from volume measurements of various liquids.
Regional Notes
United States: US gallons (3.78541 L) are the standard volume unit for liquids. This calculator uses US gallons by default.
United Kingdom: UK imperial gallons are 4.54609 L — larger than US gallons. This calculator does not support UK gallons; use the milk or custom density option for approximate conversions.
India: India uses the metric system (liters), so this converter is useful when working with imported US products or international shipping where gallons are specified.
Frequently Asked Questions
How does the gallons-to-kilograms conversion work?
The calculator uses the formula kg = gal × 3.78541 × density, where 3.78541 converts US gallons to liters, and density (default 1 kg/L for water) converts volume to mass. Different substances have different densities, so you can select the substance from the dropdown.
How many kilograms are in a gallon of water?
There are approximately 3.79 kilograms in 1 US gallon of water at room temperature. Since water has a density of about 1 kg/L, and 1 US gallon equals 3.78541 liters, the conversion is 3.79 kg/gal.
Is the conversion the same for US and UK gallons?
No, this calculator uses US gallons (3.78541 L). UK imperial gallons are larger (4.54609 L), which would give different weight results. Make sure you are using US gallons for accurate conversion.
How do I convert gallons to kg for different substances?
Select the substance from the dropdown menu. Each substance has a unique density: water (1.00 kg/L), milk (1.03), cooking oil (0.88), gasoline (0.75), diesel (0.85), and honey (1.42). The calculator uses the formula kg = gal × 3.78541 × density.
What is the density of common substances used in this converter?
Common densities include water at 1.00 kg/L, milk at 1.03 kg/L, cooking oil at 0.88 kg/L, gasoline at 0.75 kg/L, diesel at 0.85 kg/L, honey at 1.42 kg/L, and salt water at 1.03 kg/L. All densities are measured at room temperature.
Can I convert kilograms back to gallons?
Yes, you can reverse the conversion by dividing kilograms by (3.78541 × density). For example, 3.79 kg of water equals 1 US gallon. Use the formula: gal = kg / (3.78541 × density).
What is this gal to kg converter used for?
This converter is useful for cooking recipes, scientific experiments, fuel calculations, shipping and logistics, industrial mixing, and any scenario where you need to convert volume measurements (gallons) to weight (kilograms) for different materials.
Is the Gal To Kg converter free to use?
Yes, all calculators on Calculy are completely free to use with no registration or hidden charges. Use it as many times as you need for personal or professional conversions.