🧪 Fluid & 3D Spatial Geometry
Volume & Capacity Unit Converter
Convert liquid volume and 3D geometric capacity between Metric, US Customary, and Imperial standards.
Quick Presets:
1 US Gal to Liters
1 UK Gal to US Gal
1 Liter to US Cups
1 Fluid Oz to mL
1 m³ to Liters
Converted Volume
1 liter = 0.264172 gallons (US)
Equivalent Volumes Across Major Standards:
Comprehensive Guide to Liquid Volume and Geometric Capacity
Volume is the quantity of three-dimensional space enclosed by a closed boundary, such as the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. In metrology, volume is expressed both as cubic units of linear length (such as cubic meters, $m^3$) and dedicated fluid capacity units (such as liters, gallons, and fluid ounces).
The Critical Difference: US Customary vs. British Imperial
One of the most frequent causes of calculation errors in international commerce, recipes, and scientific recipes is the disparity between US Customary and UK Imperial liquid volumes:
- US Liquid Gallon: Equal to exactly 231 cubic inches, or 3.785411784 liters. Divided into 4 quarts, 8 pints, 16 cups, or 128 US fluid ounces (1 US fl oz ≈ 29.5735 mL).
- UK Imperial Gallon: Equal to exactly 4.54609 liters (the volume of 10 pounds of pure water at 62°F). Divided into 4 quarts, 8 pints, or 160 Imperial fluid ounces (1 Imperial fl oz ≈ 28.4131 mL).
- Summary: A UK gallon is approximately 20.1% larger than a US liquid gallon, but an individual US fluid ounce is about 4% larger than an imperial fluid ounce!
Volume Equivalency Reference Table
| Unit Name | Symbol | Equivalent in Liters (L) | Equivalent in Milliliters (mL) |
|---|---|---|---|
| Milliliter (Cubic Centimeter) | mL / cm³ | 0.001 L | 1.0 mL |
| Liter (SI Accepted) | L / dm³ | 1.0 L | 1,000 mL |
| Cubic Meter (SI Base) | m³ | 1,000 L | 1,000,000 mL |
| US Teaspoon | tsp | 0.00492892 L | 4.92892 mL |
| US Tablespoon | tbsp (3 tsp) | 0.0147868 L | 14.7868 mL |
| US Fluid Ounce | fl oz (US) | 0.0295735 L | 29.5735 mL |
| US Cup | cup (US) | 0.236588 L | 236.588 mL |
| US Pint | pt (US) | 0.473176 L | 473.176 mL |
| US Quart | qt (US) | 0.946353 L | 946.353 mL |
| US Gallon | gal (US) | 3.78541 L | 3,785.41 mL |
| UK Imperial Gallon | gal (UK) | 4.54609 L | 4,546.09 mL |
Frequently Asked Questions
In the US Customary system, there are exactly 16 cups in 1 gallon (1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces).
Yes. By definition, 1 liter is exactly 1 cubic decimeter (0.001 m³). Therefore, 1 milliliter (1/1000th of a liter) is mathematically identical to 1 cubic centimeter (1 cm³ or 1 cc), often used in medicine and engine displacement.