How do I convert gallons to kg?
Type a value in either box and pick the ingredient, and the answer shows it in the other unit as you type.
- Kilograms (kg)
- 3.785317
1 gal = 3.785317 kg (Water at 4 °C, 0.999975 kg per L).
Kilograms (kg): 3.785317. 1 gal = 3.785317 kg (Water at 4 °C, 0.999975 kg per L).
Kilograms (kg) by gallons (gal)
How to calculate
Converts gallons to kilograms and back for water, milk, flour, sugar, and other ingredients, from what each one weighs per liter.
Example with the default inputs (Gallons (gal) 1, Ingredient Water at 4 °C, 0.999975 kg per L): 1 gal = 3.785317 kg (Water at 4 °C, 0.999975 kg per L).
Formula: kg = gallons × 3.785411784 × 0.999975, where kilograms per liter depends on the ingredient (water at 4 °C: 0.999975 kg)
- Grams per cup are USDA FoodData Central (SR Legacy) portion weights for one level US cup (8 US fluid ounces): all-purpose flour 125 g (FDC 168894), granulated sugar 200 g (FDC 169655), brown sugar, packed 220 g (FDC 168833), powdered sugar, unsifted 120 g (FDC 169656), whole milk 244 g (FDC 171265), butter 227 g (FDC 173410), olive oil 216 g (FDC 171413), honey 339 g (FDC 169640), white rice, uncooked 185 g (FDC 169756).
- Water is pure water: 0.999975 kg per liter at 4 °C and 0.998207 kg per liter at 20 °C, from the Tanaka et al. (2001) density formula.
- Other ingredients use their USDA cup weight: kilograms per liter = grams per cup ÷ 236.5882365.
- The answer shows at most 6 decimal places; the calculation keeps full precision.
Worked examples
Each example is checked against the calculator on every build.
- Gallons (gal) 1, Ingredient Water at 4 °C, 0.999975 kg per L gives Kilograms (kg) 3.785317.Source: Density of pure water from Tanaka et al. (2001), Metrologia 38, 301: 999.9749 kg/m³ at 4 °C, 998.2067 kg/m³ at 20 °C, as 0.999975 kg per liter
- Gallons (gal) 1, Ingredient Whole milk, 1.03133 kg per L gives Kilograms (kg) 3.904.Source: USDA FoodData Central SR Legacy 171265: 1 cup = 244 g
Other questions people ask
How many kilograms are in a gallon?
It depends on the ingredient, because a volume does not fix the weight. 1 gal is about, in kilograms: all-purpose flour 2; granulated sugar 3.2; brown sugar, packed 3.52; powdered sugar, unsifted 1.92; water at 4 °C 3.785; water at 20 °C 3.779; whole milk 3.904; butter 3.632; olive oil 3.456; honey 5.424; white rice, uncooked 2.96.
How do I convert gallons to kg?
kg = gallons × 3.785411784 × 0.999975, where kilograms per liter depends on the ingredient (water at 4 °C: 0.999975 kg). For example, 1 gal of water at 4 °C is 3.785317 kg.
Does a liter of water weigh 1 kg?
Almost. Pure water weighs 0.999975 kg per liter at 4 °C, where it is densest, and 0.998207 kg per liter at 20 °C (Tanaka et al. 2001). Other liquids differ more: a liter of whole milk weighs about 1.03 kg and a liter of olive oil about 0.91 kg (USDA).