Volume Converter — Free Online Volume Unit Converter
Our free volume converter instantly converts between all major volume measurement units. Use the volume converter to switch between liters, gallons, milliliters, fluid ounces, cups and more — no sign-up required. This volume converter uses verified conversion factors based on international SI standards. Learn more at Wikipedia's volume unit reference and the NIST unit conversion guide.
🧪 Volume Converter
Quick Reference Tables
Common volume values converted at a glance.
Liters → Gallons
| Liter (L) | Gallon (US) (gal) |
|---|---|
| 0.5 L | 0.13208603 gal |
| 1 L | 0.26417205 gal |
| 2 L | 0.5283441 gal |
| 3 L | 0.79251616 gal |
| 5 L | 1.32086 gal |
| 10 L | 2.641721 gal |
| 15 L | 3.962581 gal |
| 20 L | 5.283441 gal |
| 25 L | 6.604301 gal |
| 50 L | 13.208603 gal |
Fluid Ounces → Milliliters
| Fluid Ounce (US) (fl oz) | Milliliter (mL) |
|---|---|
| 0.5 fl oz | 14.786765 mL |
| 1 fl oz | 29.57353 mL |
| 2 fl oz | 59.147059 mL |
| 3 fl oz | 88.720589 mL |
| 5 fl oz | 147.867648 mL |
| 10 fl oz | 295.735297 mL |
| 15 fl oz | 443.602945 mL |
| 20 fl oz | 591.470594 mL |
| 25 fl oz | 739.338242 mL |
| 50 fl oz | 1,478.676484 mL |
Cups → Milliliters
| Cup (US) (cup) | Milliliter (mL) |
|---|---|
| 0.5 cup | 118.294118 mL |
| 1 cup | 236.588237 mL |
| 2 cup | 473.176473 mL |
| 3 cup | 709.76471 mL |
| 5 cup | 1,182.941183 mL |
| 10 cup | 2,365.882365 mL |
| 15 cup | 3,548.823548 mL |
| 20 cup | 4,731.76473 mL |
| 25 cup | 5,914.705913 mL |
| 50 cup | 11,829.411825 mL |
Conversion Formulas
The exact math behind every volume unit conversion.
Understanding Volume Measurement Units
Liters vs Gallons — The Big Split
Liters (L) are the standard SI unit for liquid volume, used universally in science, medicine, and everyday life across most of the world. One liter equals 1,000 milliliters and is roughly the volume of a standard water bottle.
Gallons (gal) are the primary liquid volume unit in the United States and a few other countries. The US liquid gallon equals approximately 3.785 liters. Note that the UK also uses a gallon, but the imperial gallon is slightly larger at about 4.546 liters — our liters to gallons converter uses the US liquid gallon by default.
Fluid Ounces & Milliliters — Drinks & Recipes
Fluid ounces (fl oz) are widely used in the US and UK for measuring beverages, recipes, and personal care products. One US fluid ounce equals approximately 29.574 milliliters. It's a common unit on drink labels, supplement bottles, and cooking instructions.
Milliliters (mL) are the metric workhorse for small liquid volumes globally — used in medicine, chemistry, and cooking. The fl oz to mL conversion is one of the most searched cooking and nutrition conversions worldwide.
Cups — The Cooking Standard
A cup is a customary US volume unit used almost exclusively in cooking and baking recipes. One US cup equals exactly 236.588 mL (or roughly 8 fluid ounces). Cups are not part of the metric system and vary slightly by country — the US cup, the metric cup (250 mL), and the imperial cup are all slightly different.
When following a recipe from another country, the cups to mL conversion is essential to ensure your measurements are accurate regardless of which cup standard was used.
How Volume Conversions Work
Unlike temperature, volume conversions are pure multiplications — there are no offsets. Every unit has a fixed ratio to the base SI unit (the liter), so converting from any unit to any other is a single multiplication or division by a known factor.
For example: 1 liter = 0.264172 US gallons, so to convert liters to gallons you multiply by 0.264172. Our converter applies these exact internationally defined factors instantly for all unit pairs, whether you're scaling a cocktail recipe or calculating fuel tank capacity.
Frequently Asked Questions
Frequently Asked Questions
1 Liter (L) equals 0.26417205 Gallon (US)s (gal).
Multiply the value in Liters by 0.26417205. For example, 10 Liters = 2.641721 Gallon (US)s.
Yes. ConvertNow uses precise factors for all unit calculations. Currency conversions use live exchange rates updated regularly.
Yes — type into the right-hand field to reverse the conversion.