Volume Converter — Liters, Gallons, Cups, Cubic Meters & More
Convert between liters, gallons, cups, fluid ounces, cubic meters, cubic feet, and more. Free online volume converter for cooking, automotive, construction, and science.
Volume Converter
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The Formula
Volume conversion uses linear scaling factors relative to the liter. Each unit has a fixed conversion factor to liters. To convert from unit A to unit B, multiply the input value by the ratio of the two factors.
Variable Definitions
Liter
The metric base unit of volume. One liter equals the volume of a cube 10 cm on each side (1,000 cm³). Commonly used for beverages, fuel, and liquid measurements worldwide.
US Gallon
The primary US liquid volume unit. A US gallon (3.785 L) is smaller than the imperial gallon (4.546 L). Used for fuel, milk, and other bulk liquids in the US.
Fluid Ounce & Cup
US fluid ounce (29.57 mL): used for small liquid quantities in recipes and beverages. US cup (236.6 mL): the standard US cooking measure, equivalent to 8 fl oz.
Cubic Meter & Cubic Foot
Cubic meter (1,000 L): the SI unit for large volumes like shipping containers and room sizes. Cubic foot (28.32 L): used in construction, HVAC, and refrigeration in the US.
How to Use This Calculator
- 1
Enter the volume value you want to convert.
- 2
Select the current volume unit from the "From" dropdown.
- 3
Select the desired volume unit from the "To" dropdown.
- 4
The converted value is displayed instantly with the formula. Use this for cooking, automotive, construction, or science calculations.
Quick Reference
| From | To |
|---|---|
| 1 L | 0.264 US gal / 33.814 fl oz / 4.227 cups |
| 1 US gal | 3.785 L / 128 fl oz / 16 cups / 8 pt / 4 qt |
| 1 fl oz | 29.57 mL / 0.125 cup / 2 tbsp |
| 1 cup | 236.6 mL / 8 fl oz / 16 tbsp / 48 tsp |
| 1 m³ | 1,000 L / 264.17 US gal / 35.315 ft³ |
| 1 ft³ | 28.317 L / 7.481 US gal / 1,728 in³ |
| 1 qt | 0.946 L / 32 fl oz / 2 pt |
| 1 tbsp | 14.79 mL / 0.5 fl oz / 3 tsp |
Common Applications
- Cooking: converting between cups, milliliters, tablespoons, and teaspoons for international recipes
- Automotive: measuring engine displacement in liters (L) or cubic inches (in³), fuel economy in gallons or liters
- Construction: calculating concrete volume in cubic yards or cubic meters for foundations and slabs
- Shipping: determining cargo volume in cubic meters (CBM) for freight container loading
- Science: measuring liquids in lab beakers and graduated cylinders using mL and L
- HVAC: sizing air handlers and ductwork using cubic feet per minute (CFM) and refrigerant volumes
Common volume units compared. The liter is the metric standard; the US gallon, cup, and cubic foot are used in the US.
Understanding the Concept
Volume measurement spans an enormous range — from milliliters in a medicine dropper to cubic kilometers in a reservoir. The liter, defined as 1 cubic decimeter (1,000 cm³), is the everyday metric unit. A cubic meter (1,000 L) is roughly the volume of a washing machine. The US customary system uses gallons (231 cubic inches exactly), quarts (¼ gallon), pints (⅛ gallon), cups (1/16 gallon), fluid ounces (1/128 gallon), and tablespoons/teaspoons for cooking. Importantly, the US gallon (3.785 L) is smaller than the imperial/UK gallon (4.546 L) — a common source of error when following British or Canadian recipes. The cubic foot is used in construction (concrete, lumber), HVAC (airflow), and refrigeration. Engine displacement is commonly stated in liters (modern) or cubic inches (classic American cars). The US food labeling system rounds fluid ounces to exactly 30 mL (not 29.57 mL) for nutritional labels. Understanding these relationships is essential for cooking, automotive work, construction, and international trade.
Frequently Asked Questions
Sources & References
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