US Gallons to Litres Calculator

SettingsSettings for this calculationUS

Market

Imperial · sales tax

Volume (US gal)

The volume in US liquid gallons.

A US gallon is 3.785 litres. An imperial gallon, still used in some UK contexts, is 4.546 litres — about 20% larger.

Volume

18.93 L

High confidence

1 US liquid gallon = 231 cubic inches = 3.785411784 L exactly. Convert your area and use the product's own metric coverage rate rather than converting a coverage figure.

Conversion factor applied: 3.79 L per US gal

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

1 US liquid gallon is defined as 231 cubic inches = 3.785411784 L exactly

Inputs used

Volume (US gal): 5

Intermediate steps

Conversion factor applied: 3.79 L per US gal

Final result18.93 L

Confidence note: 1 US liquid gallon = 231 cubic inches = 3.785411784 L exactly. Convert your area and use the product's own metric coverage rate rather than converting a coverage figure.

Estimated cost — your price

Price per L ($)

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0

Regulatory standards & verification citations1

1 US liquid gallon is defined as 231 cubic inches = 3.785411784 L exactly

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Paints, adhesives, sealers and tank capacities all appear in gallons on American products and litres almost everywhere else. The conversion is exact, and the trap is coverage. A rate expressed as square feet per gallon combines an area unit and a volume unit, so converting it correctly means dealing with both at once — an easy place to invert a factor without noticing. The practical route is to convert the area you have measured into square metres and then read the metric coverage figure the manufacturer prints on the tin, which sidesteps the compound conversion entirely. As always, confirm whether an older or British source means the US gallon or the twenty-percent-larger imperial one.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Volume (US gal)	Volume (L)
0.5	1.89
1	3.79
2	7.57
5	18.9
10	37.9
20	75.7
50	189

Volume (US gal)

Volume (L)

0.5

1.89

3.79

7.57

18.9

37.9

75.7

189

Frequently asked questions

Does paint coverage convert directly?

Not in one step. Coverage in square feet per gallon involves both an area and a volume unit, so converting it means handling both. It is safer to convert your area to square metres and read the product's own metric coverage from the tin.

US or imperial gallon?

This uses the US liquid gallon of 3.785 litres. The imperial gallon is 4.546 litres, twenty percent larger, and appears in older UK material and in some fuel contexts. Getting the wrong one wrong-sizes a tank or a paint order by a fifth.

Is a five-gallon pail exactly five gallons?

Roughly, but pails are usually filled to a nominal content rather than to the brim, and the labelled volume is what you get. Use the label rather than the container size when calculating coverage.