Gallons to Kilograms Converter
Convert gallons (gal) to kilograms (kg) and vice versa with adjustable density settings
gal
kg
Conversion Formula
Gallons to Kilograms:
kg = gal × 3.7854 × density
Kilograms to Gallons:
gal = kg ÷ (3.7854 × density)
💡 Note: The conversion factor 3.7854 represents the number of liters in one US gallon. Density must be in grams per milliliter (g/mL) or kilograms per liter (kg/L), which are numerically equivalent.
Conversion Examples
Example 1: Water Conversion
Question: How many kilograms are in 5 gallons of water?
Solution:
kg = 5 × 3.7854 × 1.0 = 18.93 kg
Therefore, 5 gallons of water equals approximately 18.93 kilograms.
Example 2: Cooking Oil Conversion
Question: Convert 3 gallons of cooking oil to kilograms.
Solution:
kg = 3 × 3.7854 × 0.92 = 10.44 kg
Therefore, 3 gallons of cooking oil equals approximately 10.44 kilograms.
Example 3: Reverse Conversion
Question: How many gallons are in 20 kilograms of milk?
Solution:
gal = 20 ÷ (3.7854 × 1.03) = 5.13 gal
Therefore, 20 kilograms of milk equals approximately 5.13 gallons.
Water Conversion Table
| Gallons (gal) | Kilograms (kg) | Pounds (lb) |
|---|---|---|
| 0.25 | 0.95 kg | 2.09 lb |
| 0.5 | 1.89 kg | 4.17 lb |
| 1 | 3.79 kg | 8.35 lb |
| 2 | 7.57 kg | 16.69 lb |
| 3 | 11.36 kg | 25.04 lb |
| 5 | 18.93 kg | 41.73 lb |
| 10 | 37.85 kg | 83.45 lb |
| 15 | 56.78 kg | 125.18 lb |
| 20 | 75.71 kg | 166.91 lb |
| 25 | 94.64 kg | 208.63 lb |
| 50 | 189.27 kg | 417.27 lb |
| 100 | 378.54 kg | 834.54 lb |
Common Substances Conversion
| Substance | Density (g/mL) | 1 Gallon (kg) | 5 Gallons (kg) |
|---|---|---|---|
| Water | 1.00 | 3.79 kg | 18.93 kg |
| Milk | 1.03 | 3.90 kg | 19.50 kg |
| Cooking Oil | 0.92 | 3.48 kg | 17.42 kg |
| Honey | 1.42 | 5.38 kg | 26.88 kg |
| Gasoline | 0.74 | 2.80 kg | 14.01 kg |
| Diesel | 0.85 | 3.22 kg | 16.08 kg |
| Olive Oil | 0.92 | 3.48 kg | 17.42 kg |
| Sea Water | 1.03 | 3.90 kg | 19.50 kg |
Step-by-Step Conversion Process
Converting Gallons to Kilograms
- Identify the volume in gallons – Determine how many gallons you need to convert.
- Find the substance density – Look up or measure the density in g/mL or kg/L. For water at room temperature, use 1.0 g/mL.
- Apply the conversion formula – Multiply gallons by 3.7854 and then by the density: kg = gal × 3.7854 × density.
- Calculate the result – Perform the multiplication to get your answer in kilograms.
- Round appropriately – Round to 2-3 decimal places for practical use.
Converting Kilograms to Gallons
- Identify the mass in kilograms – Determine how many kilograms you need to convert.
- Find the substance density – Look up or measure the density in g/mL or kg/L.
- Apply the reverse formula – Divide kilograms by the product of 3.7854 and density: gal = kg ÷ (3.7854 × density).
- Calculate the result – Perform the division to get your answer in gallons.
- Round appropriately – Round to 2-3 decimal places for practical use.
Popular Conversions
1 gallon water
= 3.79 kg
= 3.79 kg
5 gallons water
= 18.93 kg
= 18.93 kg
10 gallons water
= 37.85 kg
= 37.85 kg
1 gallon milk
= 3.90 kg
= 3.90 kg
1 gallon oil
= 3.48 kg
= 3.48 kg
20 kg water
= 5.28 gal
= 5.28 gal
Related Conversions
If you need to convert gallons or kilograms to other units, consider these related conversions:
Volume Units
- Gallons to Liters
- Gallons to Quarts
- Gallons to Pints
- Gallons to Cups
- Gallons to Fluid Ounces
Mass Units
- Kilograms to Pounds
- Kilograms to Grams
- Kilograms to Ounces
- Kilograms to Tons
- Kilograms to Metric Tons
Other Gallon Conversions
- Gallons to Pounds
- Gallons to Grams
- Gallons to Ounces
- Gallons to Milliliters
- Imperial to US Gallons
Frequently Asked Questions
How many kilograms are in 1 gallon of water?
One US gallon of water weighs approximately 3.79 kilograms at room temperature. This is calculated using the formula: kg = 1 × 3.7854 × 1.0 (where 1.0 g/mL is the density of water). The exact weight may vary slightly with temperature, as water’s density changes with temperature.
Why do I need density to convert gallons to kilograms?
Gallons measure volume (how much space something occupies), while kilograms measure mass (the amount of matter). Different substances have different densities, meaning the same volume can have different masses. For example, 1 gallon of honey weighs more than 1 gallon of cooking oil because honey is denser. Density acts as the bridge between volume and mass.
What is the difference between US gallons and imperial gallons?
A US gallon equals 3.7854 liters, while an imperial gallon (used in the UK) equals 4.546 liters. This means 1 imperial gallon is about 20% larger than 1 US gallon. When converting to kilograms, always specify which gallon type you’re using. This converter uses US gallons by default.
How do I convert gallons of milk to kilograms?
Milk has a density of approximately 1.03 g/mL, slightly higher than water. To convert gallons of milk to kilograms, multiply the number of gallons by 3.7854 and then by 1.03. For example, 1 gallon of milk = 1 × 3.7854 × 1.03 = 3.90 kg. You can use the dropdown menu in the converter above to select milk and get automatic conversions.
Can I use this converter for gasoline or other fuels?
Yes, this converter works for any liquid substance as long as you know its density. Gasoline has a density of about 0.74 g/mL, so 1 gallon of gasoline weighs approximately 2.80 kg. Diesel fuel is denser at 0.85 g/mL, making 1 gallon about 3.22 kg. Select the appropriate substance from the dropdown or enter a custom density value.
How many gallons are in 10 kilograms of water?
Ten kilograms of water equals approximately 2.64 US gallons. This is calculated using the reverse formula: gal = 10 ÷ (3.7854 × 1.0) = 2.64 gallons. For substances other than water, the result will differ based on their density.
Does temperature affect the conversion?
Yes, temperature affects density, which in turn affects the conversion. Water has its maximum density of approximately 1.0 g/mL at 4°C (39.2°F). At room temperature (20°C/68°F), water’s density is about 0.998 g/mL. For most practical purposes, using 1.0 g/mL for water is sufficiently accurate. Other substances may have more significant density changes with temperature.
What if I need to convert imperial gallons to kilograms?
For imperial gallons, use the conversion factor 4.546 instead of 3.7854. The formula becomes: kg = imperial gallons × 4.546 × density. For example, 1 imperial gallon of water = 1 × 4.546 × 1.0 = 4.55 kg. This converter uses US gallons, so multiply your imperial gallon value by 1.201 to convert to US gallons first.