Result in US Gallons
0
Equivalent volume value
Accurate metric-to-US customary volume conversion for litres, US gallons, US pints, US quarts, Imperial gallons, and cubic metres
Convert litres to US gallons instantly using the exact definition of 3.785411784 litres per US gallon. Includes bidirectional conversion and a complete volume unit breakdown for fuel, cooking, industrial, and everyday use in 2026.
Professional metric-to-US volume conversion for fuel economy (mpg US), vehicle fuel tanks, cooking and recipes, industrial fluid storage, agriculture, pool maintenance, and all applications requiring precise litre and US gallon measurements
Convert litres to US gallons with full precision using the exact official definition: 1 US liquid gallon = exactly 231 cubic inches = 3.785411784 litres. This is derived from the exact international inch (1 in = 2.54 cm), giving 1 in³ = 16.387064 cm³ and 231 in³ = 3,785.411784 cm³ = 3.785411784 L. Therefore 1 litre = 0.264172052 US gallons. Our tool delivers reliable results for any volume with six simultaneous unit outputs — US gallons, litres, US pints, US quarts, Imperial gallons, and cubic metres.
Switch seamlessly between litres to US gallons and US gallons to litres conversion modes with one click. Get instant results in six volume units simultaneously — US gallons (US gal), litres (L), US pints (pt), US quarts (qt), Imperial gallons (imp gal), and cubic metres (m³) — from a single input value. The complete multi-unit breakdown is displayed with every result, making this the essential cross-system volume reference panel for anyone working across metric and US customary measurement systems.
Essential for US drivers and travellers converting fuel economy between L/100km (metric) and miles per US gallon (mpg), cooks and bakers converting international recipes between litres and US gallons or cups, pool and spa owners sizing chemical dosing in gallons or litres, industrial and agricultural operators calibrating equipment across metric and US customary specs, and anyone comparing product volumes, fuel prices, or container capacities between countries that use metric litres and the United States which uses US gallons.
Select conversion direction and enter your volume value below
The US liquid gallon is defined as exactly 231 cubic inches, which equals 3.785411784 litres. This integer cubic-inch definition has been the legal US gallon standard since the 19th century. Using the exact international inch (1 in = 2.54 cm), the derivation is: 231 in³ × 16.387064 cm³/in³ = 3,785.411784 cm³ = 3.785411784 litres. Conversely, 1 litre = 0.264172052 US gallons. One US gallon is subdivided into exactly 4 quarts, 8 pints, 16 cups, 32 gills, or 128 US fluid ounces — all exact integer relationships once the 3.785411784 L anchor is established.
The US gallon is used daily for fuel pricing and consumption at all US petrol stations, vehicle fuel economy ratings (mpg US), pool and spa water volumes and chemical dosing, agricultural chemical application rates, and food service/industrial fluid containers. Internationally, the US gallon appears in global commodity markets (crude oil is traded in US barrels = 42 US gallons = 158.987 L), beverage industry export specifications, and recipe conversions from US cookbooks. Critical note: the US gallon (3.785411784 L) is approximately 20% smaller than the Imperial gallon (4.54609 L) — when fuel economy is quoted in "mpg," always confirm whether US mpg or Imperial mpg is intended, as the two give different numeric values for identical fuel consumption.
Example: 40 L ÷ 3.785411784 = 10.567 US gal | 10 US gal × 3.785411784 = 37.854 L | 1 US gal = 8 US pints = 4 US quarts = 0.832674 imp gal
The US gallon (3.785411784 L) is defined as exactly 231 cubic inches. It is approximately 20% smaller than the Imperial gallon (4.54609 L). 1 US gal = 4 US quarts = 8 US pints = 128 US fl oz = 0.832674 imp gal. 42 US gallons = 1 US oil barrel = 158.987 L.
Complete reference table covering common litre values with their exact US gallon, US pint, US quart, Imperial gallon, and cubic metre equivalents. All US gallon values use the exact definition: 1 US gal = 3.785411784 L.
| Litres (L) | US Gallons | US Pints | US Quarts | Imperial Gallons | Notable Reference |
|---|---|---|---|---|---|
| 0.473 L | 0.12500 US gal | 1.000 pt | 0.500 qt | 0.10408 imp gal | 1 US pint |
| 1 L | 0.26417 US gal | 2.1134 pt | 1.0567 qt | 0.21997 imp gal | 1 litre bottle |
| 2 L | 0.52834 US gal | 4.2268 pt | 2.1134 qt | 0.43994 imp gal | 2 L bottle |
| 3.785 L | 1.00000 US gal | 8.000 pt | 4.000 qt | 0.83267 imp gal | Exactly 1 US gallon |
| 5 L | 1.32086 US gal | 10.567 pt | 5.2834 qt | 1.09985 imp gal | 5 L jerrycan |
| 10 L | 2.64172 US gal | 21.134 pt | 10.567 qt | 2.19969 imp gal | 10 L container |
| 18.927 L | 5.00000 US gal | 40.000 pt | 20.000 qt | 4.16337 imp gal | 5-gallon bucket (US) |
| 20 L | 5.28344 US gal | 42.268 pt | 21.134 qt | 4.39938 imp gal | 20 L drum |
| 37.854 L | 10.0000 US gal | 80.000 pt | 40.000 qt | 8.32674 imp gal | 10 US gallons |
| 50 L | 13.2086 US gal | 105.67 pt | 52.834 qt | 10.9985 imp gal | 50 L tank |
| 100 L | 26.4172 US gal | 211.34 pt | 105.67 qt | 21.9969 imp gal | 100 L storage tank |
| 158.987 L | 42.0000 US gal | 336.00 pt | 168.00 qt | 34.972 imp gal | 1 US oil barrel (bbl) |
| 200 L | 52.8344 US gal | 422.68 pt | 211.34 qt | 43.9938 imp gal | 200 L drum / barrel |
| 1,000 L | 264.172 US gal | 2,113.4 pt | 1,056.7 qt | 219.969 imp gal | 1 m³ / 1,000 L tank |
| 10,000 L | 2,641.72 US gal | 21,134 pt | 10,567 qt | 2,199.69 imp gal | Large storage tank |
The US liquid gallon is the primary volume unit in everyday US use, defined as exactly 231 cubic inches = 3.785411784 litres. One US gallon = 4 US quarts = 8 US pints = 16 US cups = 128 US fluid ounces. The 231 in³ definition is an exact integer, making all US customary volume conversions precise once the litre-to-inch bridge is applied. Note the US dry gallon (used for grain and produce) = 268.8025 in³ = 4.40488377 L — different from the liquid gallon. The US gallon is used for fuel, beverages, paint, agricultural chemicals, and pool water in the United States, as well as in some Latin American countries that use US customary measures.
US fuel economy is rated in miles per US gallon (mpg). Converting to metric: L/100km = 235.215 ÷ mpg (US). Examples: 25 mpg = 9.41 L/100km; 30 mpg = 7.84 L/100km; 35 mpg = 6.72 L/100km; 40 mpg = 5.88 L/100km; 50 mpg = 4.70 L/100km. Reverse: mpg (US) = 235.215 ÷ L/100km. The constant 235.215 is derived from 100 km ÷ 1.60934 km/mi × 3.785411784 L/US gal = 235.215. A car with a 60-litre fuel tank holds 60 ÷ 3.785411784 = 15.850 US gallons. At 30 mpg US, that tank delivers 30 × 15.850 = 475.5 miles of range — a direct litres-to-gallons conversion used in every US range calculation.
The US oil barrel (bbl) used in global petroleum markets = exactly 42 US gallons = 158.987295 litres. Crude oil prices quoted per barrel (e.g., "WTI at $70/bbl") refer to this 42-US-gallon, 158.987-litre unit. Conversions: 1 barrel = 42 US gal = 34.972 imp gal = 158.987 L = 0.158987 m³. A 200-litre drum (the standard oil drum) = 1.258 US barrels = 52.834 US gallons. Global daily oil production quoted in "millions of barrels per day" (Mb/d) can be converted to litres: 1 Mb/d × 158,987 L/barrel = 158,987,000 L/day = 158,987 m³/day. The 42-gallon barrel is one of the most important litre-to-gallon anchors in global commodity trading.
US recipes use cups, pints, quarts, and gallons. The hierarchy: 1 US cup = 236.588 mL = 0.236588 L. 1 US pint = 2 cups = 473.176 mL. 1 US quart = 2 pints = 4 cups = 946.353 mL = 0.946353 L. 1 US gallon = 4 quarts = 16 cups = 3.785411784 L. Converting international (metric) recipes to US: 1 L = 4.2268 US cups = 2.1134 US pints = 1.0567 US quarts = 0.26417 US gallons. Note: the UK/Australian "cup" = 250 mL differs from the US cup (236.6 mL) — a 5.6% difference that matters in baking. Always use the US cup (236.6 mL) when converting from US gallon recipes, not the metric 250 mL cup.
US swimming pools are sized in US gallons, while international pools use litres or m³. A standard US backyard pool (16 ft × 32 ft × 5 ft average depth) = 2,560 ft³ = 19,149 US gallons = 72,481 L = 72.481 m³. Chemical dosing for chlorination, pH, and algaecide is specified in oz per 10,000 US gallons — converting metric pool volumes: L ÷ 3.785411784 = US gallons for dosing calculations. A 50,000-litre pool = 13,209 US gallons — use this figure for US chemical treatment product instructions. Pool pump sizing in US GPM (gallons per minute) × 3.785411784 = L/min flow rate for metric equipment compatibility.
The complete US liquid volume hierarchy in litres: 1 US fl oz = 29.5735 mL. 1 US gill = 118.294 mL. 1 US cup = 236.588 mL. 1 US pint = 473.176 mL = 16 fl oz. 1 US quart = 946.353 mL = 2 pints. 1 US gallon = 3.785411784 L = 4 quarts = 8 pints = 128 fl oz. 1 US oil barrel = 158.987 L = 42 US gallons. All relationships are exact integers above the gallon; the 3.785411784 L/gal bridge is the only non-integer conversion. Note: US fl oz (29.574 mL) differs slightly from Imperial fl oz (28.413 mL) — never substitute them in precision measurements or pharmaceutical calculations.
For a fast litres to US gallons estimate: divide litres by 3.785 (or multiply by 0.264). Examples: 10 L ÷ 3.785 ≈ 2.642 US gal (exact: 2.6417). 50 L ÷ 3.785 ≈ 13.21 US gal (exact: 13.209). For US gallons to litres: multiply by 3.785 for a quick estimate. Example: 10 US gal × 3.785 = 37.85 L (exact: 37.854 L). An even simpler rule: 1 US gallon ≈ 3¾ litres (exactly 3.785), or 4 litres ≈ just over 1 US gallon. For cooking: 1 litre ≈ 4.23 US cups, so multiply litres by 4 for a quick cup estimate. For fuel: 1 L ≈ 0.264 US gallons — multiply litres of fuel by ¼ to get approximate US gallons at a glance.
Everyday US container sizes and their litre equivalents (× 3.785411784 L/gal): 1 US gal = 3.785 L (paint tin, milk jug). 2.5 US gal = 9.464 L (small petrol container). 5 US gal = 18.927 L (standard US bucket, fuel jerrycan). 6 US gal = 22.712 L (home brewing fermentor). 10 US gal = 37.854 L (aquarium). 15 US gal = 56.781 L (large aquarium). 20 US gal = 75.708 L (large aquarium). 42 US gal = 158.987 L (1 oil barrel). 55 US gal = 208.198 L (standard US drum). 275 US gal = 1,040.99 L (IBC tote). 330 US gal = 1,249.19 L (large IBC). These are the standard US container sizes referenced daily across American industry, agriculture, and retail.
The US gallon (3.785411784 L) and Imperial gallon (4.54609 L) differ by approximately 20% and are not interchangeable. A US car rated at 30 mpg (US) achieves approximately 36 mpg (Imperial) — the same fuel consumption, but a 20% higher number in Imperial mpg. A "55-gallon drum" in the US = 208.2 L; a "55-gallon drum" sized in Imperial gallons = 250.0 L — a difference of 41.8 litres. Fuel pricing per gallon in the US (US gal) vs UK (sold per litre, but historically per Imperial gal) gives incomparable per-unit costs without conversion. When specifying volumes in gallons on international documents, procurement orders, or recipe publications, always write "US gal" or "imp gal" — never "gal" without qualification. This single annotation prevents a systematic 20% volume error across all cross-border transactions.
Converting litres to US gallons requires dividing by the exact definition 3.785411784 (or multiplying by 0.264172052). Here is the complete step-by-step process with a worked example:
For converting US gallons to litres, multiply by 3.785411784. Example: 5 US gal × 3.785411784 = 18.927 L (standard US 5-gallon bucket). Example: 42 US gal × 3.785411784 = 158.987 L (1 US oil barrel). The bidirectional calculator above handles both directions instantly with full six-unit output. For related tools, our Litres to Imperial Gallons Converter and Litres to Barrels Converter cover the full gallon and barrel toolkit.
The National Institute of Standards and Technology (NIST) is the official US authority for weights and measures, confirming the US liquid gallon as exactly 231 cubic inches = 3.785411784 litres. NIST Handbook 44 governs commercial weighing and measuring devices in the United States, including fuel dispensers, beverage containers, and industrial fluid measurements. The NIST Special Publication 811 provides complete SI and US customary unit conversion factors used by engineers, scientists, and trade professionals across all US industries.
Visit NIST →Explore our full library of free conversion tools covering volume, weight, length, area, pressure, temperature, and energy — all built for fast, accurate results on any device. Every converter outputs complete multi-unit breakdowns in a single result panel, making them ideal for drivers, engineers, cooks, farmers, pool owners, and anyone working across metric litres and US customary gallon measurements in daily life or professional applications worldwide.
Browse All Converters →Our Litres to Barrels converter is the essential companion to this US gallons tool — since 1 US oil barrel = exactly 42 US gallons = 158.987295 litres, the barrel-to-litre and gallon-to-litre conversions share the same 3.785411784 L/gal base factor. Essential for petroleum engineers, commodity traders, refinery operators, and anyone converting between barrels (the global crude oil pricing unit) and metric litres for production, logistics, pricing, and environmental reporting calculations.
Convert L to Barrels →