Convert 18 Liter (L) to Gallon (US) (gal).

18 Liter equals 4.755097 Gallon (US). Multiply 18 by 0.2641720524.

18 Liter = 4.755097 Gallon (US)

Worked example: converting Liter to Gallon (US)

Step 1 — start with the formula. gal = L × 0.2641720524
Step 2 — substitute your figure. 18 L × 0.2641720524
Step 3 — read the result. 18 L = 4.755097 gal
Step 4 — check it in reverse. L = gal × 3.785411784 returns 18 L, which matches the figure you started with.

Volume Converter

40 units available

Decimals:

From

To

4.755097

18 L = 4.755097 gal

Formula:

gal = L × 0.2641720524

With your value: 18 L = 4.75509694 gal

How big is that?

Everyday references on a logarithmic scale, all expressed in liter so you can sanity-check the result.

Milk carton (1/1.8e+4 your value)0.00100 L

Kitchen bucket (1/1.8e+3 your value)0.0100 L

Car fuel tank (1/3.6e+2 your value)0.0500 L

Bathtub (1/90 your value)0.200 L

Hot tub (1/12 your value)1.50 L

Your value18.0 L

Other Liter to Gallon (US) conversions

13 L to gal 14 L to gal 15 L to gal 16 L to gal 20 L to gal 21 L to gal 24 L to gal Full Liter to Gallon (US) converter

Liter to Gallon (US) Conversion Table

Liter (L)	Gallon (US) (gal)
0.5	0.132086
1	0.264172
2	0.528344
5	1.32086
10	2.641721
15	3.962581
20	5.283441
25	6.604301
50	13.208603
100	26.417205
250	66.043013
500	132.086026
1000	264.172052

Gallon (US) to Liter Conversion Table

Gallon (US) (gal)	Liter (L)
0.5	1.892706
1	3.785412
2	7.570824
5	18.927059
10	37.854118
15	56.781177
20	75.708236
25	94.635295
50	189.270589
100	378.541178
250	946.352946
500	1,892.705892
1000	3,785.411784

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Liter (L)

Volume

Exact conversion

The litre is exactly 10⁻³ m³ (1 dm³) and is accepted for use with the SI.

Source: Units accepted for use with the SI, SI Brochure Table 8

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Gallon (US) (gal)

Volume

Exact conversion

The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Standards and context behind Liter to Gallon (US)

US liquid gallon: Defined as exactly 231 cubic inches, i.e. 3.785411784 L.
Imperial gallon: A different unit at 4.54609 L, used in the UK and Canada — about 20% larger.
EIA fuel reporting: US fuel volumes are reported in gallons, which is why fuel-economy conversions cross this boundary constantly.

How to Convert Liter to Gallon (US)

To convert from Liter (L) to Gallon (US) (gal), multiply the value by 0.2641720524.

Formula: gal = L × 0.2641720524

Reverse: L = gal × 3.785411784

Step-by-Step Example

Start with your value in Liter. For example: 5 L
Multiply by the conversion factor: 5 x 0.2641720524
The result is: 1.32086 gal

About Liter

The liter is a metric unit of volume equal to 1,000 milliliters or 1 cubic decimeter. It is widely used for measuring liquids.

Common uses: beverages, fuel, cooking.

About Gallon (US)

The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.

Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.

Common uses: fuel (US), beverages, swimming pools.

Frequently Asked Questions

What is 18 Liter in Gallon (US)?

18 Liter equals 4.755097 Gallon (US).

How many Gallon (US) are in 1 Liter?

There are exactly 0.2641720524 Gallon (US) in 1 Liter. This means the conversion factor from Liter to Gallon (US) is 0.2641720524.

What is the formula to convert Liter to Gallon (US)?

The formula to convert Liter to Gallon (US) is: gal = L × 0.2641720524. For example, to convert 10 Liter to Gallon (US), you would multiply 10 by 0.2641720524.

What is a Liter?