About Gallons to Liters Converter
This converter turns gallons into liters. One gallon is 3.78541 liters. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
To convert by hand, multiply the number of gallons by 3.7854118. For example, 10 gal × 3.7854118 = 37.8541 L. To go back, multiply liters by 0.26417205. For a rough mental estimate, multiply by about 3.8, which is off by about 0.4 percent.
One gallon is 3,785.41 ml. Teaspoons, tablespoons, fluid ounces, cups, quarts and gallons here are US customary units, built from the US gallon of 231 cubic inches (3.785411784 L). Imperial units used in the UK are larger: an imperial gallon is 4.54609 L.
One US gallon is 3.78541 liters. A 15 gallon tank holds 56.7812 L and a 5 gallon water jug holds 18.9271 L. Imperial gallons are bigger (4.54609 L), so check which gallon a figure uses.
How to use Gallons to Liters Converter
- Choose a group such as Length or Temperature from the Quantity picker. It opens on a worked conversion.
- Type the value you want to convert in the From box. Decimals and negative numbers are fine.
- Pick the unit you have in the From list and the unit you want in the To list. The swap button reverses the pair.
- Read the result in the result card, and use the copy button to put it on your clipboard.
- Set Precision to Auto, or to a fixed number of decimals from 0 to 10, if you need a specific rounding.
- Check the formula line and the chart of common values under the result when you want to see how the number was reached.
Features
- 102 units in 15 groups, from nanometers and light-years to square miles, and from bits to tebibytes. It includes milligrams, UK gallons and pints, cubic meters, feet and inches, degrees and radians, hertz and rpm, and bits per second to MB/s.
- Results update as you type, with a swap button to reverse the pair.
- Precision control: Auto (up to 8 significant digits) or 0 to 10 fixed decimals.
- A copy button for the result.
- The formula and the factor in both directions, shown under the result.
- A chart of common values (1, 2, 5, 10, 20, 25, 50, 75, 100, 250, 500 and 1,000) for the pair you chose.
- Temperature handled with proper offset formulas, plus the UK gas mark oven table.
- Fuel economy handled as an inverse, so US and UK miles per gallon and liters per 100 km convert correctly.
- Bangladesh land units: decimal (shotangsho), katha and bigha.
- Both decimal data units (KB, MB, GB, TB) and binary ones (KiB, MiB, GiB, TiB), clearly labeled.
Gallons to liters formula
To convert gallons to liters, multiply the value by 3.7854118.
To go the other way, multiply liters by 0.26417205, which is the same as dividing by 3.7854118.
L = gal × 3.7854118Worked examples
10 gal gives 37.8541 L
10 × 3.7854118 = 37.8541
20 gal gives 75.7082 L
20 × 3.7854118 = 75.7082
Gallons to liters conversion chart
| Gallons (gal) | Liters (L) |
|---|---|
| 0.25 | 0.946353 |
| 0.5 | 1.89271 |
| 1 | 3.78541 |
| 2 | 7.57082 |
| 3 | 11.3562 |
| 4 | 15.1416 |
| 5 | 18.9271 |
| 6 | 22.7125 |
| 8 | 30.2833 |
| 10 | 37.8541 |
| 12 | 45.4249 |
| 15 | 56.7812 |
| 20 | 75.7082 |
| 25 | 94.6353 |
| 50 | 189.271 |
Privacy: how it works
- Every conversion is calculated by code running in your browser tab. The values you type are never sent to Ulkaa or anyone else, and nothing is stored.
- There is no account and no sign-up for this tool, and it costs nothing to use.
Tips
- Use the swap button instead of retyping when you need the reverse conversion.
- For a quick mental check, round the factor: 1 inch is about 2.5 cm, 1 kg is about 2.2 lbs, 1 mile is about 1.6 km.
- Set Precision to 2 decimals for cooking, shopping and travel, and to 6 or more for engineering work.
- Check whether a figure uses US or imperial units before converting volumes, gallons and miles per gallon.
- For land, convert for a rough size, then confirm the area from the deed or survey record.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your values are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your values are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How many liters are in a gallon?
One gallon is 3.78541 liters.
How many gallons are in a liter?
One liter is 0.264172 gallons.
How do I convert gallons to liters by hand?
Multiply the value in gallons by 3.7854118. For example, 10 gal is 37.8541 L. To reverse it, divide by 3.7854118.
Are these US or imperial units?
They are US customary units. One US gallon is 3,785.41 ml and one US liter is 1,000 ml. UK imperial units differ: an imperial gallon is 4.54609 L and an imperial fluid ounce is 28.4131 ml, so a recipe or fuel figure from the UK will not match.
How many liters is a gallon?
One US gallon is 3.78541 liters.
How many liters is 5 gallons?
5 US gallons is 18.9271 liters.
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