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Volume Converter

Popular volume unit conversions

Volume Converter — Convert Any Unit of Volume Instantly

Our free online Volume Converter lets you instantly convert between 76+ units of volume — from everyday metric and imperial units to culinary, industrial, and Biblical measures. Whether you need to convert liters to gallons, cubic meters to cubic feet, milliliters to fluid ounces, or barrels to quarts, this tool delivers fast and accurate results with no installation required.

Volume measures the amount of three-dimensional space an object or substance occupies. It is used in cooking, engineering, medicine, science, and commerce. Units span multiple systems:

  • Metric (SI): cubic meter (m³), liter (L), milliliter (mL), cubic centimeter (cm³), kiloliter (kL)
  • Imperial / US customary: gallon (US & UK), quart, pint, cup, fluid ounce, tablespoon, teaspoon
  • Cubic imperial: cubic foot, cubic inch, cubic yard, cubic mile
  • Industrial: barrel (oil), barrel (US), hogshead, tun, cord
  • Culinary & apothecary: gill, minim, dram, drop

All conversions use internationally standardized SI factors and high-precision arithmetic, making this tool reliable for cooking, chemistry, engineering, agriculture, and everyday tasks.

Common Volume Conversion Reference

Here are the most frequently used volume conversions for quick reference:

  • 1 liter = 1000 milliliters = 0.264172 US gallons = 0.219969 UK gallons
  • 1 US gallon = 3.78541 liters = 4 quarts = 8 pints = 16 cups = 128 fluid ounces
  • 1 UK gallon = 4.54609 liters = 4 UK quarts = 8 UK pints
  • 1 cubic meter = 1000 liters = 264.172 US gallons = 35.3147 cubic feet
  • 1 cubic foot = 28.3168 liters = 7.48052 US gallons
  • 1 fluid ounce (US) = 29.5735 milliliters
  • 1 barrel (oil) = 158.987 liters = 42 US gallons
  • 1 cup (US) = 236.588 milliliters = 8 fluid ounces

Frequently Asked Questions — Volume Converter

Question: How do I use the Volume Converter?

Answer: Select the unit you are converting from in the left list and the unit to convert to in the right list, then type your value. The result appears instantly — no button click needed.

Question: How many milliliters are in a liter?

Answer: There are exactly 1,000 milliliters (mL) in one liter (L). This is the fundamental metric volume relationship — the liter is 1,000 times larger than the milliliter.

Question: How many liters are in a gallon?

Answer: One US gallon equals approximately 3.78541 liters. One UK (Imperial) gallon equals approximately 4.54609 liters. The two gallon sizes differ significantly, so always clarify which gallon is intended.

Question: What is the difference between a US gallon and a UK gallon?

Answer: A US liquid gallon equals 3.78541 liters (231 cubic inches). A UK Imperial gallon equals 4.54609 liters (277.42 cubic inches). The UK gallon is approximately 20% larger than the US gallon.

Question: How many cups are in a liter?

Answer: One liter equals approximately 4.22675 US cups. A US cup is defined as exactly 236.588 mL. A metric cup (used in some countries) is 250 mL, giving 4 metric cups per liter.

Question: How do I convert cubic meters to liters?

Answer: One cubic meter equals exactly 1,000 liters. To convert, multiply the number of cubic meters by 1,000. For example, 2.5 m³ = 2,500 liters.

Question: How many fluid ounces are in a pint?

Answer: In the US system, there are 16 fluid ounces in one pint. In the UK Imperial system, there are 20 fluid ounces in one pint. The US pint is 473.176 mL and the UK pint is 568.261 mL.

Question: What is a barrel in oil measurement?

Answer: One oil barrel (bbl) equals exactly 42 US gallons or approximately 158.987 liters. This is the standard unit used in the petroleum industry worldwide for measuring crude oil and petroleum products.

Question: How many tablespoons are in a cup?

Answer: There are exactly 16 tablespoons (US) in one cup (US). One US tablespoon equals 14.7868 mL and one US cup equals 236.588 mL.

Question: Can I convert between metric and imperial volume units?

Answer: Yes. The converter supports full cross-system conversion between metric units (liter, milliliter, cubic meter, etc.) and US/UK imperial units (gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon), as well as industrial and Biblical units.