18 Liter to Gallon (US)
Quick answer
18 Liter (L) equals
4.755097 gal
To convert 18 Liters to Gallon (US)s, multiply by 0.2641720524. Therefore, 18 Liter (L) equals 4.755097 Gallon (US) (gal).
Formula: gal = L × 0.2641720524. Calculation: 18 × 0.2641720524 = 4.755097 gal.
Convert Liter (L) to Gallon (US) (gal) online with our free unit converter. In volume, 1 L = 0.264172 gal. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
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
18 L = 4.755097 gal
Formula:
gal = L × 0.2641720524With 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.
Other Liter to Gallon (US) conversions
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
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
The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.
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
Liter and Gallon (US) Relationship
This conversion bridges the Metric (SI) and US Customary / Imperial measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 Liter represents a fraction of a Gallon (US) (1 Gallon (US) ≈ 3.7854 Liters), the Gallon (US) is the larger measurement interval. Understanding the relationship between Liter and Gallon (US) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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 of Liter: 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 of Gallon (US): 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)s are in 1 Liter?
- There are exactly 0.2641720524 Gallon (US)s 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 Liters to Gallon (US)s, you would multiply 10 by 0.2641720524.
- What is a 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.
- What is a 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.
- What are the common uses of Liter?
- The Liter is commonly used in beverages, fuel, cooking.
- Is a US gallon the same as a UK gallon?
- No. A US liquid gallon is 3.78541 L; an imperial (UK) gallon is 4.54609 L, roughly 20% larger.
- How many litres in a US gallon of petrol?
- Exactly 3.785411784 litres, since the US gallon is defined as 231 cubic inches.
Related Volume Conversions
Cite this page
UnitConvertLab. (2026). 18 Liter to Gallon (US). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/18-liter-to-gallon_us