Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Convert Gallons to Liters instantly with an exact, accurate formula -- no sign-up, no ads blocking the result.
Converting Gallons to Liters means multiplying by an exact, fixed constant (3.78541178) rather than an approximation -- the same factor this calculator uses internally. Volume conversions are everywhere in cooking, brewing, automotive fluids, and international recipes, since the US customary system (cups, pints, quarts, gallons) differs from the metric system (milliliters, liters) most of the rest of the world uses -- and even within the US system, cups/pints/quarts/gallons/tablespoons/teaspoons each have their own conversion factor to remember. One liter equals exactly 1,000 milliliters, or about 0.264172 US gallons. One US gallon equals exactly 3.785411784 liters, or 4 quarts.
Enter your value and confirm the "From Unit" dropdown is set to Gallons -- the result grid updates instantly, showing your value converted into every unit in this volume category at once (not just Liters), so you can see multiple equivalent measurements without switching tools. There's no button to press and nothing is sent to a server, so it works the same on a phone with no signal as it does on a desktop.
Liters = Gallons × 3.78541178
US customary volume units are all defined relative to the US gallon (231 cubic inches by legal definition), while the liter is defined as exactly 1,000 cubic centimeters -- the gallon-to-liter factor (3.785411784) that connects the two systems is a precise, internationally recognized constant, not a rounded approximation.
| Gallons | Liters |
|---|---|
| 1 | 3.78541178 |
| 5 | 18.92705892 |
| 10 | 37.85411784 |
| 50 | 189.2705892 |
| 100 | 378.5411784 |
Recipe conversion between US customary and metric measurements for cooking and baking. Calculating liquid volumes for brewing, automotive fluids, or chemical mixing. Comparing container sizes labeled in different volume units. For related conversions, see Grams to Teaspoons Converter.
This calculator carries full precision internally and only rounds the final displayed result for readability -- if you need more or fewer decimal places than shown, the underlying value is still exact to the limits of floating-point arithmetic.
Multiply the Gallons value by 3.78541178 to get Liters. This calculator does that automatically as you type, so you don't need to do the multiplication by hand.
Yes -- 1 Gallons equals 3.78541178 Liters by definition, so the result is mathematically exact rather than a rounded estimate (the displayed value may be rounded for readability, but the underlying calculation isn't).
Yes -- change the "From Unit" dropdown above the input to switch direction. The same conversion engine handles every unit in this category, not just Gallons and Liters.
US customary units throughout -- the UK/Imperial system defines a gallon, pint, and fluid ounce at different sizes than the US system, so a UK-based Gallons or Liters figure would need a different conversion factor than the one used here.
Liters is one of the standard units for measuring volume -- see the Practical Uses section above for the specific contexts where it's most commonly encountered.
100 gallons equals 378.541178 liters, using the same 3.78541178 factor as the rest of this page.
Multiplying a us gallons value by 3.785412 gives you liters. The reverse conversion divides by 3.785412, which is the same as multiplying by 0.2641721. For example, 12.5 us gallons × 3.785412 = 47.31765 liters, and 7 us gallons × 3.785412 = 26.49788 liters.
One US gallon equals exactly 3.785411784 liters, or 4 quarts. One liter equals exactly 1,000 milliliters, or about 0.264172 US gallons.
| US Gallons | Liters |
|---|---|
| 1 | 3.785412 |
| 2 | 7.570824 |
| 3 | 11.35624 |
| 5 | 18.92706 |
| 10 | 37.85412 |
| 15 | 56.78118 |
| 20 | 75.70824 |
| 25 | 94.63529 |
| 50 | 189.2706 |
| 75 | 283.9059 |
| 100 | 378.5412 |
| 250 | 946.3529 |
| 500 | 1,892.706 |
| 1,000 | 3,785.412 |
How many liters are in 1 us gallons?
1 us gallons equals 3.785412 liters.
How many us gallons are in 1 liters?
1 liters equals 0.2641721 us gallons.
What is 3.5 us gallons in liters?
3.5 us gallons equals 13.24894 liters, using the same 3.785412 factor as the rest of this chart.
Is this conversion exact or approximate?
The 3.785412 factor comes from a fixed, exact definitional constant, so the underlying math is exact; the numbers on this page are rounded to seven significant digits for readability, and the calculator above keeps the full-precision value.
Values are rounded to seven significant digits for display; the converter above uses the full-precision factor.
Reference: NIST Weights and Measures