Gallon to Liter Converter
Enter the value that you want to convert gallon (gal) to liter (L) or liter to gallon.Also written as GAL to L conversion.
1 gallon = 3.7854118 liter
Formula: liter = gallon value × 3.7854118
GAL to L — gallon to liter
10 gallon = 37.85412 liter
Popular Volume Converters:
Converting Gallon to Liter
The Gallon Explained
Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 3.7854118 liter.
The Liter Explained
Liter (L) is a unit of volume measurement. 1 liter is equal to 0.2641721 gallon.
Volume Measurement Systems
Volume units are particularly confusing because the US and UK gallons differ (US gallon = 3.785 L, UK gallon = 4.546 L), as do their pints, cups, and fluid ounces. Cooking, fuel economy, beverage production, and pharmaceutical compounding all require precise volume conversions. Laboratory work uses milliliters and liters while US recipes specify cups, tablespoons, and fluid ounces.
gallon to liter metric conversion table
| 0.01 gal | = | 0.03785 L |
| 0.1 gal | = | 0.37854 L |
| 1 gal | = | 3.78541 L |
| 2 gal | = | 7.57082 L |
| 3 gal | = | 11.35624 L |
| 4 gal | = | 15.14165 L |
| 5 gal | = | 18.92706 L |
| 6 gal | = | 22.71247 L |
| 7 gal | = | 26.49788 L |
| 8 gal | = | 30.28329 L |
| 9 gal | = | 34.06871 L |
| 10 gal | = | 37.85412 L |
| 11 gal | = | 41.63953 L |
| 12 gal | = | 45.42494 L |
| 13 gal | = | 49.21035 L |
| 14 gal | = | 52.99576 L |
| 15 gal | = | 56.78118 L |
| 16 gal | = | 60.56659 L |
| 17 gal | = | 64.35200 L |
| 18 gal | = | 68.13741 L |
| 19 gal | = | 71.92282 L |
| 20 gal | = | 75.70824 L |
| 30 gal | = | 113.56235 L |
| 40 gal | = | 151.41647 L |
| 50 gal | = | 189.27059 L |
| 60 gal | = | 227.12471 L |
| 70 gal | = | 264.97882 L |
| 80 gal | = | 302.83294 L |
| 90 gal | = | 340.68706 L |
| 100 gal | = | 378.54118 L |
| 200 gal | = | 757.08236 L |
| 300 gal | = | 1135.62354 L |
| 400 gal | = | 1514.16471 L |
| 500 gal | = | 1892.70589 L |
| 600 gal | = | 2271.24707 L |
| 700 gal | = | 2649.78825 L |
| 800 gal | = | 3028.32943 L |
| 900 gal | = | 3406.87061 L |
| 1000 gal | = | 3785.41178 L |
How to Convert GAL to L (Gallon to Liter)?
We can convert gallon to liter by using an example.
Example:
Convert 20 Gallon to Liter?
We know 1 Gallon = 3.7854118 liter; 1 Liter = 0.2641721 gallon.
20 gallon = ___L
20 × 3.7854118 = 75.70824 L (we know 1 gallon = 3.7854118 liter)
Answer:
20 gallon = 75.70824 liter
How to Convert US Gallons to Liters (Step-by-Step)
The US gallon is the standard unit for measuring fuel, pool water, and household water usage in the United States. One US gallon equals exactly 3.78541 liters. This conversion is essential for travelers comparing fuel prices internationally and for understanding water consumption metrics.
- Write down the volume in US gallons you want to convert.
- Multiply the gallon value by 3.78541.
- The result is the equivalent volume in liters.
- For a quick estimate, multiply gallons by 3.8 (within 0.4% accuracy).
Common US Gallons to Liters Conversions
Reference table for frequently encountered gallon-to-liter conversions in everyday life, from fuel tanks to swimming pools:
| Gallon | Liter |
|---|---|
| 1 gallon | 3.785 L |
| 5 gallons | 18.927 L |
| 10 gallons | 37.854 L |
| 15 gallons | 56.781 L |
| 20 gallons | 75.708 L |
| 30 gallons | 113.562 L |
| 50 gallons | 189.271 L |
| 15,000 gallons | 56,781 L |
Solved Examples: Gallons to Liters
Question 1: A car has a 16-gallon fuel tank. How many liters does it hold?
Solution:
Volume in liters = gallons × 3.78541
= 16 × 3.78541
= 60.567 liters
Answer: A 16-gallon tank holds approximately 60.57 liters.
Question 2: You need to fill a 25,000-gallon swimming pool. How many liters of water is that?
Solution:
Volume in liters = gallons × 3.78541
= 25,000 × 3.78541
= 94,635.25 liters
Answer: 25,000 gallons = 94,635.25 liters (about 94.6 cubic meters of water).
Question 3: Gas costs $3.50 per gallon in the US. What is the equivalent price per liter?
Solution:
Price per liter = price per gallon ÷ 3.78541
= $3.50 ÷ 3.78541
= $0.924 per liter
Answer: $3.50/gallon ≈ $0.92/liter.
Question 4: A household uses 80 gallons of water per day. Convert to liters.
Solution:
Volume in liters = 80 × 3.78541
= 302.833 liters per day
Answer: 80 gallons/day = approximately 303 liters/day.
Practice Questions
Try solving these on your own to test your understanding:
- Convert 12 gallons to liters. (Answer: 45.425 L)
- A truck has a 35-gallon tank. How many liters? (Answer: 132.49 L)
- How many liters are in 100 gallons? (Answer: 378.541 L)
- If fuel costs €1.80/liter, what is the equivalent per US gallon? (Answer: €6.81/gal)
- A hot tub holds 400 gallons. Convert to liters. (Answer: 1,514.16 L)
US Gallon vs. UK Imperial Gallon
The US gallon (3.78541 L) is smaller than the UK imperial gallon (4.54609 L). This difference dates back to 1824 when Britain redefined the gallon based on the volume of 10 pounds of water, while the US kept the older Queen Anne wine gallon. When converting gallons to liters, always confirm which gallon system is being used — the 20% difference is significant for fuel economy comparisons and recipe scaling.
Fuel Economy: MPG to L/100km
When traveling internationally, you may need to convert US MPG (miles per gallon) to the metric L/100km. The formula is: L/100km = 235.215 ÷ MPG. For example, a car rated at 30 MPG uses about 7.84 L/100km. European and Asian countries use L/100km, so this conversion is essential for comparing vehicle efficiency when renting cars abroad.
Water Usage: Understanding Your Utility Bill
US water utilities often bill in gallons or CCF (100 cubic feet = 748 gallons = 2,832 liters). An average American household uses about 300 gallons (1,136 liters) per day. Converting to liters helps compare water usage with international conservation benchmarks, where daily per-capita targets are often expressed in liters.
Key Takeaways
- Multiply US gallons by 3.78541 to get liters.
- Quick estimate: gallons × 4 minus 5% ≈ liters.
- A US gallon is about 20% smaller than a UK imperial gallon.
- A typical car fuel tank (15-20 gallons) holds 57-76 liters.
- For fuel price conversion: divide $/gallon by 3.785 to get $/liter.
- Average US household uses ~300 gallons (1,136 L) of water per day.
Gallon to Liter Conversion Formula
liter = gallon × 3.7854118
1 gallon = 3.7854118 liter
1 liter = 0.2641721 gallon
Reverse: gallon = liter × 0.2641721
Frequently Asked Questions
How many liter are in 1 gallon?
There are 3.7854118 liter in 1 gallon. To convert gallon to liter, multiply the value by 3.7854118.
How do I convert gallon to liter?
Multiply your gallon value by 3.7854118 to get the equivalent in liter. For example, 5 gallon = 5 × 3.7854118 = 18.92706 liter.
How do I convert liter to gallon?
Multiply your liter value by 0.2641721 to get the equivalent in gallon. Alternatively, divide by 3.7854118.
What is 10 gallon in liter?
10 gallon is equal to 37.85412 liter.
What is 100 gallon in liter?
100 gallon is equal to 378.54118 liter.