Gasoline weighs roughly 2.7 to 2.9 kilograms per US gallon, or about 6.0 to 6.4 pounds, across a representative density range. Using 0.74 kg/L as a practical midpoint gives 2.80 kg (6.18 lb) per US gallon. One imperial gallon is larger and would contain about 3.36 kg at the same density.
The exact answer varies. Gasoline is a blend of hydrocarbons and additives whose composition changes with grade, season, region, and applicable specification. Temperature changes volume and density as well. For casual load estimates, a midpoint may be enough; commercial fuel measurement, vehicle engineering, transport, and safety work require authoritative current data.
Gasoline weight per gallon table
This table uses a representative density of 0.74 kg/L and excludes the fuel tank or portable container.
| Fuel volume | Liters | Weight (kg) | Weight (lb) |
|---|---|---|---|
| 1 US gallon | 3.785 | 2.80 | 6.18 |
| 5 US gallons | 18.927 | 14.01 | 30.88 |
| 10 US gallons | 37.854 | 28.01 | 61.76 |
| 20 US gallons | 75.708 | 56.02 | 123.51 |
| 50 US gallons | 189.271 | 140.06 | 308.79 |
| 1 imperial gallon | 4.546 | 3.36 | 7.42 |
At 0.71 kg/L, a US gallon weighs about 2.69 kg. At 0.77 kg/L, it weighs about 2.91 kg. Use a range when the blend is unknown instead of presenting the midpoint as exact.
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What is gasoline density?
A useful broad range for gasoline is approximately 0.71–0.77 kg/L, equivalent to 710–770 kg/m³ or 0.71–0.77 g/mL under stated conditions. Unlike pure water, gasoline has no one molecular composition. Refineries blend components to meet performance, emissions, volatility, and seasonal requirements.
Ethanol content and other blend components can influence density, but the product label alone does not provide a precise batch value. If the calculation affects custody transfer or engineering, obtain density and reference conditions from an authorized measurement or document.
Why temperature affects gallons
Gasoline expands when warmed and contracts when cooled. The same mass therefore occupies more gallons when warm, and density expressed as mass per volume decreases. One fixed gallon of colder gasoline generally contains more mass than one gallon of warmer gasoline from the same product.
Fuel retail and wholesale systems may use regulated measurement practices and temperature compensation depending on jurisdiction and transaction. Do not improvise corrections from a generic coefficient for commercial purposes. Use the applicable equipment, standards, and documentation.
A mass-based statement avoids some volume-temperature ambiguity: the same closed quantity retains essentially the same mass as temperature changes, although its volume changes. The distinction is especially important when comparing tank gauge readings over a warm day.
Gasoline conversion formulas
With density in kg/L:
gasoline mass (kg) = liters × density
liters = kilograms ÷ density
US gallons = kilograms ÷ density ÷ 3.785411784
imperial gallons = kilograms ÷ density ÷ 4.54609
Use the gasoline kg-to-gallons calculator for a quick estimate and density sensitivity check. If you know tank volume, the gallons-to-kilograms calculator performs the reverse calculation.
Worked gasoline calculations
Weight of a 15-US-gallon fill
At 0.74 kg/L:
15 × 3.785411784 × 0.74 = 42.02 kg, or about 92.64 lb
This is fuel mass only, not vehicle curb weight. The actual amount delivered and blend density determine the real added mass.
Convert 100 kg to US gallons
100 ÷ 0.74 = 135.135 L
135.135 ÷ 3.785411784 = 35.70 US gal
Using the low density of 0.71 gives 37.20 gallons; using 0.77 gives 34.31 gallons. A range of nearly three gallons matters when selecting a container.
Portable five-gallon can
Five US gallons at 0.74 kg/L weigh 14.01 kg. If the empty approved container weighs 2.5 kg, gross mass is about 16.51 kg. Rated capacity, fill limits, vapor space, legal requirements, and safe handling take priority over nominal arithmetic.
Comparing 100 US and imperial gallons
One hundred US gallons at 0.74 kg/L weigh 280.12 kg. One hundred imperial gallons weigh 336.41 kg. The roughly 56 kg difference comes entirely from the gallon definitions. Always include “US” or “imperial” in cross-border specifications.
Why gasoline floats on water
Gasoline is less dense than water, so in a simple separated mixture it tends to form an upper layer. That fact does not make a spill predictable or safe. Gasoline is volatile, flammable, harmful, and capable of spreading; emergency response must follow local safety guidance, not a density experiment.
Some fuel components can dissolve to limited degrees, and agitation or additives complicate behavior. Density provides only one part of environmental fate and spill response.
Vehicle range and payload considerations
Fuel economy is usually expressed per volume in some markets and per distance in others, while aircraft and certain engineering calculations emphasize mass. Knowing fuel mass helps explain why a full tank increases vehicle weight, but it is not enough to calculate range. Engine efficiency, route, temperature, driving behavior, aerodynamic load, and usable tank volume all matter.
For a preliminary payload estimate, multiply the planned liters by an appropriate density. Do not subtract a guessed value from a regulated payload limit. Vehicle documentation, actual measurements, and local rules control safe loading.
Storage and transportation
Gasoline requires approved containers, ventilation controls, ignition-source management, labeling, spill precautions, and compliance with fire and hazardous-material rules. A volume-to-weight calculation does not establish whether a container, room, vehicle, or shipment is legal or safe.
Gross shipping weight includes gasoline, containers, closures, pallets, and other materials. Tanks also need suitable vapor space rather than being filled simply to geometric capacity. Consult competent authorities and product safety documentation for the particular jurisdiction and operation.
Gasoline compared with other liquids
| Liquid | Representative density (kg/L) | Approx. kg/US gal |
|---|---|---|
| Gasoline | 0.74 | 2.80 |
| Jet fuel | 0.80 | 3.03 |
| Vegetable oil | 0.92 | 3.48 |
| Water | 1.00 | 3.79 |
| Honey | 1.42 | 5.38 |
The comparison reinforces why a gallon is not a unit of weight. Read how many kilograms are in a gallon for the general principle, or compare aviation fuel in what is the weight of jet fuel.
Common mistakes
Do not treat gasoline as water, assume all blends have identical density, or quote pounds per gallon without naming the gallon standard and conditions. Avoid confusing fuel mass with the gross weight of a can or tanker. Do not infer volume from a tank’s exterior dimensions without its rated usable capacity.
Another error is reporting excessive precision. If density is assumed as 0.74 kg/L, 2.800 decimal-heavy results are not more accurate than “about 2.80 kg per US gallon.” State the assumption and round appropriately.
Frequently asked questions
How much does one US gallon of gasoline weigh?
At 0.74 kg/L, about 2.80 kg or 6.18 lb. A representative range is roughly 2.69–2.91 kg per US gallon.
What is gasoline density?
A broad planning range is about 0.71–0.77 kg/L, but blend, season, temperature, and specifications influence the actual value.
How much do 10 US gallons weigh?
About 28.01 kg or 61.75 lb at 0.74 kg/L, excluding the tank or can.
Is gasoline lighter than water?
Yes. Typical gasoline density is well below water’s approximately 1.00 kg/L, so equal gasoline volume has less mass.
Bottom line
Use 2.80 kg or 6.18 lb per US gallon as a clear midpoint, not a guaranteed property. For consequential work, use the actual fuel density, reference temperature, correct gallon standard, certified equipment, and applicable safety and measurement procedures.
Sources & References
- NIST: SI Units and Volume Measurement Standards
- BIPM: The International System of Units (SI Brochure)
- The Engineering ToolBox: Liquids Densities Reference
- USDA FoodData Central: Food and Beverage Reference Values
- For product-specific density, use the manufacturer’s verified Technical Data Sheet (TDS) or Safety Data Sheet (SDS) at 20°C (68°F).
