🧪 Volume Conversion

Convert between volume and capacity units for cooking, shipping, science, and industry. Supports metric units (milliliter, liter, cubic meter), US customary units (gallon, quart, pint, cup, fluid ounce), imperial units, and scientific units.

Volume and capacity conversion calculates three-dimensional space across metric liters and US/Imperial liquid measures. Defined by NIST Handbook 44, 1 liter (L) equals 1,000 milliliters (cm³), 1 US liquid gallon equals exactly 231 cubic inches (approx. 3.78541 L), and 1 Imperial gallon equals exactly 4.54609 liters.

Metrological Standards & Base Equation

1 liter = 0.264172 gallons. 1 gallon = 3.78541 liters. 1 cubic meter = 35.3147 cubic feet.

Fluid and dry capacity measurements strictly comply with NIST Handbook 44 (Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices) and the UK Weights and Measures Act (1985) for Imperial units.

Primary References: NIST SP 811 (2008 Edition) · NIST Handbook 44 · Standards Directory

Supported Volume Units (14 Total)

Volume Unit Definitions and Scaling Factors
Unit Symbol Unit Name System Equivalent in Liter
mL Milliliter Metric 1 mL = 0.001 L
L Liter Metric Reference Standard (1 L)
m³ Cubic Meter Metric 1 m³ = 1000 L
in³ Cubic Inch Imperial 1 in³ = 0.0163871 L
ft³ Cubic Foot Imperial 1 ft³ = 28.3168 L
gal Gallon Imperial 1 gal = 3.78541 L
qt Quart Imperial 1 qt = 0.946353 L
pt Pint Imperial 1 pt = 0.473176 L
bbl Barrel Imperial 1 bbl = 158.987 L
fl oz Fluid Ounce Imperial 1 fl oz = 0.0295735 L
tbsp Tablespoon Imperial 1 tbsp = 0.0147868 L
tsp Teaspoon Imperial 1 tsp = 0.00492892 L
cup Cup Imperial 1 cup = 0.24 L
drop Drop Other 1 drop = 0.00005 L

Popular Volume Conversions

Liters to Gallons

L → gal — fuel economy & liquid measurement

Gallons to Liters

gal → L — international volume comparison

Milliliters to Fluid Ounces

mL → fl oz — cooking & recipes

Cubic Meters to Cubic Feet

m³ → ft³ — shipping & storage

Quarts to Liters

qt → L — kitchen & cooking

Common Use Cases

  • Cooking & baking (mL↔fl oz, cup)
  • Fuel & automotive (L↔gal)
  • Shipping & storage (m³↔ft³)
  • Science & chemistry (mL↔L)
  • Aquariums & pools (L↔gal)

Frequently Asked Questions

How many liters in a gallon?

One US gallon equals 3.78541 liters. One UK gallon equals 4.54609 liters.

How do I convert milliliters to fluid ounces?

Divide milliliters by 29.5735 to get US fluid ounces. For example, 250 mL ÷ 29.5735 = 8.45 fl oz.