Result in US Gallons
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Equivalent volume
Accurate volume conversion between litres (L) and US gallons — metric to American standard, and back
Convert litres to US gallons instantly using the exact factor of 3.785411784 L per US gallon. Full multi-unit breakdown into US gal, AU gal, mL, m³, and ft³ — all in one free tool for 2026.
Professional volume conversion for fuel, cooking, appliances, swimming pools, agriculture, and international trade with the United States
The US gallon is the standard unit of liquid volume in the United States, defined as exactly 231 cubic inches = 3.785411784 litres — an exact value established by international agreement. It descends from the English wine gallon of 1707, which was standardised at 231 in³. The US gallon is used in America for fuel (gasoline and diesel), beverages (milk, juice, bottled water), household chemicals, paint, and appliance capacities. Because the US is one of the few countries still using non-metric units in everyday commerce, the litres-to-US-gallons conversion is one of the most frequently needed metric-to-imperial conversions globally — especially for fuel pricing, product imports/exports, and appliance comparisons.
The US gallon (3.785411784 L) and the Australian/imperial gallon (4.54609 L) are two different units sharing the same name. The AU gallon is approximately 20% larger than the US gallon — a critical difference in practical use. Ratio: 1 AU gal = 1.20095 US gal. This converter simultaneously displays both US and AU gallon equivalents so you can always compare. Common confusion areas: US fuel economy (mpg-US) vs AU/UK mpg; US appliance capacity (fridge, washer) vs metric equivalents; US recipe cups and gallons vs Australian metric measures; US pool chemical dosing charts vs litre-based Australian pools. Always confirm which gallon is referenced before applying any conversion.
US gallons appear in many everyday contexts globally: Fuel and petrol pricing — US gas stations price by the gallon; international oil markets quote in USD per barrel (42 US gal); Beverage and food industry — US milk jugs in ½ gal and 1 gal; wine and spirits in gallons for production volumes; Pool and spa maintenance — US pool chemical dosing charts in gallons; US appliances — refrigerators, washing machines, water heaters in cubic feet or gallons; Agriculture — irrigation, spray equipment, fertiliser mixing in gal/acre; Automotive — fuel economy in mpg (US gallon); coolant and oil capacities; Aquariums — US tank sizes (10 gal, 20 gal, 55 gal) as industry standard.
Select conversion direction, enter your volume value, and get instant multi-unit results including both US and AU (imperial) gallons
The US liquid gallon is defined as exactly 231 cubic inches, which equals 3.785411784 litres — a value that is exact by definition under the international yard and pound agreement of 1959 (since 1 inch = 25.4 mm exactly, so 231 in³ = 231 × (0.0254 m)³ × 10⁶ cm³/m³ = 3,785.411784 cm³ = 3.785411784 L). The US gallon traces its roots to the English wine gallon standardised at 231 in³ in 1707 under Queen Anne, which the American colonies inherited and retained after independence — while Great Britain later switched to the larger imperial gallon (4.54609 L) in 1824. This historical divergence explains why the US and AU/UK gallons differ by approximately 20% today.
In practical terms, 1 US gallon = 3.785411784 L and 1 litre = 0.264172052 US gal. The US gallon subdivides into 4 US quarts = 8 US pints = 16 US cups = 128 US fluid ounces. Note that US fluid ounces (29.5735 mL) differ from imperial fluid ounces (28.4131 mL). The US also uses a dry gallon (4.40488 L) for dry goods, but this is rarely encountered in everyday use — the "US gallon" almost always refers to the liquid gallon of 3.785411784 L. For international oil markets, 1 barrel of crude oil = 42 US gallons = 158.987 L, making this conversion essential for energy and petrochemical industries worldwide.
Example: 50 L ÷ 3.78541 = 13.209 US gal | 20 US gal × 3.78541 = 75.708 L
1 US gal = 3.78541 L | 1 AU gal = 4.54609 L | 1 US gal = 4 qt = 8 pt = 128 fl oz | 1 bbl (oil) = 42 US gal = 158.987 L
To convert litres to US gallons, divide by 3.785411784 (or multiply by 0.264172052). To convert US gallons back to litres, multiply by 3.785411784. Here are three practical worked examples:
Input: 60 L (metric fuel tank)
Formula: 60 ÷ 3.78541
= 15.850 US gal
= typical compact car fuel tank
Input: 55 US gal (standard tank)
Formula: 55 × 3.78541
= 208.198 L
= popular US aquarium size
Input: 42 US gal (1 barrel)
Formula: 42 × 3.78541
= 158.987 L
= 1 standard crude oil barrel
L → US gal (quick estimate): Divide litres by 3.8 for a fast approximation — error is less than 0.4%. Example: 76 L ÷ 3.8 = 20 US gal (exact: 20.082 US gal). US gal → L (quick estimate): Multiply by 3.8 — close enough for most purposes. Example: 10 US gal × 3.8 = 38 L (exact: 37.854 L). Precision method: Always use 3.785411784 (multiply) or 0.264172052 (multiply) for technical calculations. Key benchmarks: 1 US gal = 3.785 L; 5 US gal = 18.927 L; 10 US gal = 37.854 L; 100 US gal = 378.541 L. Fuel economy: L/100km = 235.21 ÷ mpg (US). Example: 30 mpg (US) = 235.21 ÷ 30 = 7.84 L/100km. Oil barrel: 1 bbl = 42 US gal = 158.987 L. US vs AU gallon: Multiply US gal × 1.20095 to get AU gal; divide AU gal by 1.20095 for US gal.
Complete reference table from small containers through large tanks and commercial volumes, with US gal, AU gal, m³, and ft³ equivalents plus real-world context. Desktop shows the full table; mobile shows grouped cards.
| Litres (L) | US Gallons | AU Gallons (imp) | m³ | ft³ | Real-World Reference |
|---|---|---|---|---|---|
| 1 L | 0.26417 US gal | 0.21997 | 0.001 | 0.03531 | 1 litre bottle |
| 3.785 L | 1.000 US gal | 0.83267 | 0.003785 | 0.13368 | Exactly 1 US gallon |
| 5 L | 1.3209 US gal | 1.09985 | 0.005 | 0.17657 | Paint tin / jerrycan |
| 7.571 L | 2.000 US gal | 1.66535 | 0.007571 | 0.26736 | Exactly 2 US gallons |
| 10 L | 2.6417 US gal | 2.19969 | 0.010 | 0.35315 | Large bucket |
| 18.927 L | 5.000 US gal | 4.16337 | 0.018927 | 0.66840 | 5 US gal carboy / brew batch |
| 20 L | 5.2834 US gal | 4.39938 | 0.020 | 0.70629 | Fuel canister |
| 37.854 L | 10.000 US gal | 8.32674 | 0.037854 | 1.33681 | Exactly 10 US gallons |
| 50 L | 13.209 US gal | 10.9985 | 0.050 | 1.76573 | Large drum / cooler |
| 60 L | 15.850 US gal | 13.1981 | 0.060 | 2.11888 | Typical car fuel tank |
| 75.708 L | 20.000 US gal | 16.6535 | 0.075708 | 2.67361 | Exactly 20 US gallons |
| 100 L | 26.417 US gal | 21.9969 | 0.100 | 3.53147 | Oil drum / large aquarium |
| 113.562 L | 30.000 US gal | 24.9801 | 0.113562 | 4.01043 | Exactly 30 US gallons |
| 151.416 L | 40.000 US gal | 33.3069 | 0.151416 | 5.34721 | 40 gal US water heater |
| 158.987 L | 42.000 US gal | 34.9723 | 0.158987 | 5.61481 | 1 oil barrel (bbl) |
| 200 L | 52.834 US gal | 43.9938 | 0.200 | 7.06293 | Standard 200 L drum |
| 208.198 L | 55.000 US gal | 45.7971 | 0.208198 | 7.35222 | 55 gal US aquarium |
| 378.541 L | 100.000 US gal | 83.267 | 0.378541 | 13.3681 | Exactly 100 US gallons |
| 500 L | 132.086 US gal | 109.985 | 0.500 | 17.6573 | Livestock water trough |
| 757.082 L | 200.000 US gal | 166.535 | 0.757082 | 26.7361 | Exactly 200 US gallons |
| 1,000 L | 264.172 US gal | 219.969 | 1.000 | 35.3147 | 1 m³ / IBC tote / kilolitre |
| 2,000 L | 528.344 US gal | 439.938 | 2.000 | 70.629 | Small above-ground pool |
| 5,000 L | 1,320.86 US gal | 1,099.85 | 5.000 | 176.573 | Large domestic water tank |
| 10,000 L | 2,641.72 US gal | 2,199.69 | 10.000 | 353.147 | Small swimming pool |
🟢 Green = small / everyday | 🟧 Orange = household / medium industrial | 🔵 Blue = large / commercial
Fuel in the United States is priced and sold by the US gallon, while the rest of the world predominantly uses litres. A US gas price of $3.50/gal converts to $3.50 ÷ 3.78541 = $0.925/L. Conversely, a fuel price of AED 3.00/L = AED 3.00 × 3.78541 = AED 11.36/US gal. International oil trading uses the 42-US-gallon barrel: 1 bbl = 42 US gal = 158.987 L. Crude oil at $80/bbl = $80 ÷ 158.987 = $0.503/L. Airlines, shipping companies, and multinational fleet operators constantly convert between litres (metric refuelling) and US gallons (US aircraft/vessel specs and fuel pricing) for cost analysis, route planning, and carbon accounting.
The US aquarium industry uses gallons as the universal tank size standard: 10 gal, 20 gal, 29 gal, 40 gal, 55 gal, 75 gal, 90 gal, 125 gal are all standard US tank sizes. Converting: 10 US gal = 37.85 L; 20 US gal = 75.71 L; 55 US gal = 208.2 L; 125 US gal = 473.2 L. Chemical dosing, stocking density, and filtration capacity are all calculated per gallon in US aquarium guides — so knowing the litre equivalent of your US-spec tank is essential for applying metric-based chemical dosing rates. US aquarium equipment (filters, heaters, skimmers) is rated in gallons per hour (GPH) — converting to L/h requires multiplying by 3.78541.
American recipes and food production specs use US gallons, quarts, pints, and cups — all based on the US gallon (3.78541 L). Key conversions: 1 US gal = 4 US quarts = 8 US pints = 16 US cups = 128 US fl oz. 1 US cup = 236.588 mL (not 250 mL); 1 US fl oz = 29.5735 mL. A US recipe calling for 1 gallon of milk = 3.785 L. Food manufacturers scaling US recipes to metric production require this conversion. Beverage industry: US standard keg = 15.5 US gal = 58.67 L (half barrel) or 7.75 US gal = 29.34 L (quarter barrel/"pony keg"). Wineries and distilleries converting US gallon production records to litre-based export documentation need this conversion daily.
US-marketed home appliances specify capacity in US gallons or cubic feet: water heaters (40 gal = 151.4 L; 50 gal = 189.3 L; 80 gal = 302.8 L), washing machines (4.5 cu ft ≈ 127 L), dishwashers (per-cycle in gallons). US-made pressure washers are rated in GPM (gallons per minute): 2 GPM = 7.57 L/min. US paint is sold by the US gallon (3.785 L) — coverage rates on US paint cans are in ft² per gallon. Importers and comparison shoppers evaluating US appliance specs against metric-labelled products require this conversion to compare actual capacities. Paint contractors using US-sourced products need to convert coverage rates for metric area specifications.
US agricultural specifications use gallons per acre (GPA) for spray application rates, gallons per minute (GPM) for irrigation flow, and US gallons for chemical mixing. A herbicide application rate of 20 GPA = 20 × 3.78541 = 75.71 L/ha (approximately, adjusting for acre-to-hectare: × 2.471 = 186.9 L/ha). US irrigation pumps rated at 100 GPM = 100 × 3.78541 = 378.5 L/min = 6.31 L/s = 22.7 m³/h. Agricultural equipment imported from the US to metric countries requires these flow rate conversions for compliance with local specifications. Fertiliser mixing ratios in US guides (oz per gallon or gal per acre) need converting to mL/L or L/ha for metric country application.
US fuel economy figures are expressed in miles per gallon (mpg), using the US gallon (3.78541 L) — distinct from AU/UK mpg which uses the imperial gallon (4.54609 L). To convert US mpg to L/100km: L/100km = 235.21 ÷ mpg(US). Examples: 25 mpg (US) = 9.41 L/100km; 30 mpg (US) = 7.84 L/100km; 50 mpg (US) = 4.70 L/100km. To convert L/100km to US mpg: mpg(US) = 235.21 ÷ L/100km. US EPA fuel economy labels list city/highway/combined mpg — international buyers comparing US-market car specs to metric-labelled equivalents need this conversion. Note: EPA combined mpg may differ from real-world fuel consumption by 10–15%.
1 US gal = 3.785411784 L (exact). 1 L = 0.264172052 US gal. 5 US gal = 18.927 L. 10 US gal = 37.854 L. 42 US gal = 1 oil barrel = 158.987 L. 100 US gal = 378.541 L. 1,000 US gal = 3,785.41 L. US gal subdivisions: 1 US gal = 4 qt = 8 pt = 16 cups = 128 fl oz. 1 US cup = 236.588 mL (not 250 mL). 1 US fl oz = 29.5735 mL. US vs AU gallon: 1 US gal = 0.832674 AU gal; 1 AU gal = 1.20095 US gal. Fuel economy: L/100km = 235.21 ÷ mpg(US). Quick rule: L ÷ 3.785 ≈ US gal; US gal × 3.785 ≈ L. Use full factor 3.785411784 for precision work.
The single most common error in gallon conversions is applying the wrong gallon type. The US gallon = 3.78541 L is about 20% smaller than the AU/imperial gallon = 4.54609 L. This matters in: Fuel economy — a car achieving 30 US mpg uses more fuel than 30 AU mpg (30 US mpg = 7.84 L/100km vs 30 AU mpg = 9.42 L/100km); Tank capacities — a "10-gallon" US fish tank (37.85 L) vs a "10-gallon" pre-metric AU tank (45.46 L); Chemical dosing — a US pool guide's "1 cup per 10,000 gallons" uses US gallons (37,854 L per 10,000 US gal) vs 45,461 L per 10,000 AU gal — a 20% difference in dosing. Always confirm the gallon type from the source document before converting. This calculator always shows both US and AU gallons simultaneously for immediate comparison.
The National Institute of Standards and Technology (NIST) provides the authoritative US definition of the liquid gallon as exactly 231 cubic inches = 3.785411784 litres. NIST Handbook 44 and Special Publication 811 establish the exact conversion factors for all US customary volume units. The 231 in³ definition has been in force since the international yard and pound agreement of 1959, which set 1 inch = 25.4 mm exactly — from which the litre equivalence is derived with full precision.
Visit NIST →The US Energy Information Administration (EIA) is the primary source for US energy data, publishing oil production, consumption, and pricing statistics in barrels (42 US gal) and US gallons. The EIA provides conversion factors for energy units including barrels to litres, gallons to cubic metres, and BTU-based energy equivalents — essential for international energy data comparison and analysis. Their unit conversion reference confirms: 1 barrel of crude oil = 42 US gallons = 158.987 litres.
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