Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Gallons to Liters Converter (gal to L)
liters = US gallons × 3.785411784.
Fill-up math when the pump is in gallons and the car computer is in liters. Multiply US gallons by 3.785. A 15 gal fill is 56.8 L. UK gallons would overstate that by about 20%.
US gallons
Going the other way? Open the reverse converter
gal → L
56.781 L
5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
- You typed
- 15 gal
- One L is
- 0.264 gal
- How it’s calculated
- liters = US gallons × 3.785411784.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
US gallons
The “US gallons” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Fill-up math when the pump is in gallons and the car computer is in liters. Multiply US gallons by 3.785. A 15 gal fill is 56.8 L. UK gallons would overstate that by about 20%. liters = US gallons × 3.785411784. Example: 5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
liters = US gallons × 3.785411784.
Example: 5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
When to use this Gallons to Liters
Common use cases
- Fill-up math when the pump is in gallons and the car computer is in liters. Multiply US gallons by 3.785. A 15 gal fill is 56.8 L. UK gallons would overstate that by about 20%.
- Sanity-check with this case: 5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
- The relationship is: liters = US gallons × 3.785411784.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: US gallons
- liters = US gallons × 3.785411784.
- Example on the page: 5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
How to Convert Gallons to Liters Step-by-Step
- 1Enter US gallons. Use the values you have, not a catalog average, unless that is all you know.
- 2liters = US gallons × 3.785411784.
- 3Worked case: 5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
liters = US gallons × 3.785411784.
5 gal bucket → 18.93 L. 13.2 gal tank → 50.0 L.
Example: set US gallons = 15, then read the result.
Variable definitions
- value
US gallons
The “US gallons” field. Default 15; typical range 0–100000.
- The conversion (liters = US gallons × 3.785411784.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Convert volume here, distance on the miles page, then do the fuel economy yourself — or use a dedicated MPG tool.
Related calculators
Unit Converters
- Imperial Gallons to LitersThe UK (imperial) gallon is exactly 4.54609 L. The US liquid gallon is 3.785411784 L. A British 8-gallon beer firkin and a US 5-gallon bucket are not cousins. If the pump is in Canada or the UK, this is the gallon.
- GPM to L/min1 US gpm = 3.785 L/min. A 2.5 gpm showerhead is 9.5 L/min. UK gallons are larger. Fixture laws care about the number on the aerator, not the pipe diameter.
- Liters to GallonsCar tanks, paint, and aquariums. This is the US liquid gallon (3.785 L), not the UK gallon (4.546 L). Divide liters by 3.785. A 50 L tank is 13.2 US gal. Using the UK gallon will short you fuel.
- Bushels to LitersA US bushel is 35.239 L of volume. Grain “bushels” on a scale ticket are often a weight standard (56 lb of corn, etc.), not a filled basket. This page is the struck volume bushel. Ask which one the elevator meant.
- Cubic Inches to Cubic CentimetersEngine displacement: a “350” small-block is 350 in³, about 5.7 L (5,735 cc). Multiply in³ by 16.387. One liter is 1,000 cm³. This is why 5.0 L and 302 in³ show up on the same valve cover.
- Cups to MillilitersUS customary cup is 240 mL in nutrition labels and 236.6 mL in the true fluid-cup (8 fl oz). This page uses the 8 fl oz cup (236.6 mL). A “metric cup” in Australia is 250 mL. If the cake falls, check which cup the author owned.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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