Gallons To Grams
Convert US gallons to grams by substance or custom density. Free volume-to-weight converter supports water, milk, oil, honey, and more for accurate results.
About This Calculator
Our free gallons to grams converter helps you instantly convert any volume in US gallons to its equivalent weight in grams. Whether you are a chef scaling recipes, a student working on chemistry problems, or a professional needing accurate volume-to-weight conversions, this tool supports water, milk, cooking oil, gasoline, diesel, honey, maple syrup, salt water, flour, sugar, and butter with built-in density values.
The conversion uses the standard formula: Mass (g) = Volume (gal) × 3,785.41 × Density (g/mL). One US gallon equals exactly 3,785.41 milliliters. For water, which has a density of 1 g/mL, 1 gallon weighs 3,785.41 grams. For other substances, the calculator multiplies by the appropriate density, so a gallon of honey (1.42 g/mL) weighs about 5,375 grams while a gallon of cooking oil (0.88 g/mL) weighs about 3,331 grams.
Regional Notes
US: US gallons (3.78541 L) are the standard volume unit for liquids in the United States. Water weighs 8.34 lb per gallon (3,785 g).
UK: UK imperial gallons are larger at 4.54609 L (4,546 g of water). This calculator uses US gallons — multiply UK gallons by 4,546.09 and density for imperial gallon results.
India: India uses the metric system (liters, kilograms). 1 US gallon = 3.785 liters. This converter is useful when working with US recipes or import specifications.
Frequently Asked Questions
How many grams are in a gallon of water?
There are approximately 3,785.4 grams in 1 US gallon of water. This is because 1 US gallon equals 3,785.41 mL and water has a density of 1 g/mL, so mass = 3,785.41 mL × 1 g/mL = 3,785.41 g.
How many grams are in a gallon of milk?
A US gallon of milk weighs approximately 3,899 grams. Milk has a density of about 1.03 g/mL, so 3,785.41 mL × 1.03 g/mL = 3,899 g.
How do you convert gallons to grams?
To convert gallons to grams, multiply the volume in gallons by 3,785.41 to get milliliters, then multiply by the density of the substance in g/mL. The formula is: Mass (g) = Volume (gal) × 3,785.41 × Density (g/mL). For water with density 1 g/mL, simply multiply gallons by 3,785.41.
How many grams are in 5 gallons of water?
5 US gallons of water weighs approximately 18,927 grams or 18.93 kg. This is calculated as 5 × 3,785.41 = 18,927.05 g.
Is this gallons to grams converter free to use?
Yes, all calculators on Calculy are completely free to use. No registration, login, or payment is required. You can use this gallons to grams converter as many times as you need.
Can I convert UK gallons to grams?
This calculator uses US gallons (3.78541 L). UK gallons are larger at 4.54609 L. To convert UK gallons to grams, multiply UK gallons by 4,546.09 and then by the density in g/mL. We recommend using a dedicated UK gallon calculator for accurate results.