Volume Converters

Volume Converter

Convert instantly between liters, milliliters, cubic meters, cubic feet, cubic inches, US gallons, and imperial gallons.

Value to Convert

From Unit

To Unit

Quick Presets:

Converted Volume

Decimals:

Equivalent Output (L)Live Output

3.7854 L

Equivalent Standard Volume Units

Milliliters (mL)

3,785.4118 mL ml

Cubic Meters (m³)

0.0038 m³ m3

Cubic Centimeters (cm³)

3,785.4118 cm³ cm3

Cubic Millimeters (mm³)

3,785,411.784 mm³ mm3

Cubic Feet (ft³ / cu ft)

0.1337 ft³ ft3

Cubic Inches (in³)

231 in³ in3

Cubic Yards (yd³)

0.005 yd³ yd3

US Liquid Gallons (gal)

1 US gal us_gal

Imperial Gallons (UK gal)

0.8327 Imp gal imp_gal

US Fluid Ounces (fl oz)

128 fl oz us_fl_oz

US Cups

16 cup us_cup

US Pints (pt)

8 pt us_pt

US Quarts (qt)

4 qt us_qt

Mathematical Formula & Step-by-Step Derivation

SI Normalized Math

General Formula:

Converted Volume = Input Value × (From Unit SI Normalizer / To Unit SI Normalizer)

Live Calculation With Your Input Values:

11. Unit Conversion Factor

Formula: 1 US gal = 3.785412 L

Substituted: 1 US gal × 3.785412

Step Result: 3.7854 L

Normalized to SI base: 1 US gal = 0.003785 m³

Complete Engineering Guide: How to Convert Volume & Capacity Units

Volume and capacity conversion is a daily necessity in science, engineering, international commerce, culinary arts, pharmaceutical compounding, and freight logistics. Because different industries and nations utilize metric (SI), US Customary, and British Imperial measurement systems, converting accurately between cubic units (like cubic meters, cubic feet, cubic inches) and liquid capacity units (like liters, milliliters, US gallons, imperial gallons, and fluid ounces) requires exact conversion factors.

Under the International System of Units (SI), all volume measurements normalize to the cubic meter (m³). Liquid measures like the liter (L) are officially defined as exactly one cubic decimeter (1 L = 1 dm³ = 0.001 m³).

Identify Source & Target Systems: Determine whether you are converting within the metric system (e.g., milliliters to liters), within US Customary units (e.g., cubic feet to gallons), or across systems (e.g., liters to US gallons).
Distinguish US Customary vs. Imperial Units: Be aware that 1 Imperial Gallon (UK, Canada, Australia) equals 4.54609 Liters, whereas 1 US Liquid Gallon equals 3.78541 Liters. An imperial gallon is approximately 20% larger than a US gallon.
Normalize to Cubic Meters (Base SI): In mathematical software, multiply your input quantity by its exact conversion factor to cubic meters (m³), then divide by the target unit's factor.
Round to Required Significant Digits: For scientific laboratory work, maintain 4 to 6 significant figures. For commercial shipping or construction, rounding to 2 or 3 decimal places is standard.

Exact Volume Conversion Mathematical Factors (NIST / ISO Standard)

Liters to US Gallons:US Gallons = Liters ÷ 3.785411784

US Gallons to Liters:Liters = US Gallons × 3.785411784

Cubic Feet to Liters:Liters = Cubic Feet × 28.316846592

Cubic Feet to US Gallons:US Gallons = Cubic Feet × 7.48051948

Cubic Meters to Cubic Feet:Cubic Feet = Cubic Meters × 35.3146667

Cubic Yards to Cubic Feet:Cubic Feet = Cubic Yards × 27

Multi-Unit Conversion Worked Example: Sizing an Aquaponics Reservoir

Engineering Problem: An aquaponics facility installs a rectangular water reservoir measuring 120 cubic feet (ft³). Convert this capacity into Liters, Cubic Meters (m³), US Liquid Gallons, Imperial Gallons, and total water weight in kilograms and pounds.

1. Starting Volume: 120.00 ft³

2. Convert to Liters: 120 × 28.31685 L/ft³ = 3,398.02 Liters

3. Convert to Cubic Meters: 3,398.02 L ÷ 1,000 = 3.3980 m³

4. Convert to US Gallons: 120 × 7.48052 gal/ft³ = 897.66 US Gallons (or 3,398.02 ÷ 3.78541 = 897.66 gal)

5. Convert to Imperial Gallons: 3,398.02 L ÷ 4.54609 = 747.46 Imperial Gallons

6. Water Mass (kg at 4°C): 3,398.02 Liters × 1.0 kg/L = 3,398.02 kg (~3.40 Metric Tonnes)

7. Water Mass (lbs): 897.66 US Gallons × 8.34 lbs/gal = 7,491.00 lbs

Units and Measurement Conversions

Unit Name	Symbol	Equivalent in m³	Equivalent in Liters	Equivalent in US Gallons
Milliliter (cm³ / cc)	mL	0.000001 m³	0.001 L	0.000264 gal
Liter (dm³)	L	0.001 m³	1.0 L	0.264172 gal
Cubic Meter	m³	1.0 m³	1,000.0 L	264.172 gal
Fluid Ounce (US)	fl oz	0.00002957 m³	0.02957 L (29.57 mL)	0.0078125 gal
US Liquid Gallon	gal (US)	0.0037854 m³	3.78541 L	1.0 gal
Imperial Gallon	gal (UK)	0.0045461 m³	4.54609 L	1.20095 gal
Cubic Foot	ft³	0.0283168 m³	28.3168 L	7.48052 gal
Cubic Yard	yd³	0.7645549 m³	764.555 L	201.974 gal

Practical Notes & Guidelines

US Fluid Ounce vs. Imperial Fluid Ounce: 1 US fluid ounce is 29.5735 mL, whereas 1 Imperial fluid ounce is 28.4131 mL. However, there are 128 fl oz in a US gallon and 160 fl oz in an Imperial gallon.
Liquid vs. Dry Gallons: US Dry Gallon (used in agricultural grains) is 4.40488 Liters, compared to the US Liquid Gallon of 3.78541 Liters. Our calculator defaults to standard US Liquid Gallons.
Precision in Bulk Chemical Trading: In petroleum trading, 1 Barrel (bbl) is officially defined as exactly 42 US gallons (158.9873 Liters).

Frequently Asked Questions

How many liters are in 1 US gallon versus 1 Imperial gallon?▼

There are 3.78541 Liters in 1 US Liquid Gallon. There are 4.54609 Liters in 1 British Imperial Gallon. An Imperial gallon is exactly 20% larger than a US gallon.

How do I convert cubic feet to gallons?▼

Multiply cubic feet by 7.48052 to get US Liquid Gallons. For example, 10 cubic feet of water equals 10 × 7.48052 = 74.81 US Gallons.

How many cubic inches are in a gallon and a cubic foot?▼

One US liquid gallon contains exactly 231 cubic inches (in³). One cubic foot (ft³) contains 1,728 cubic inches (12 × 12 × 12 in³).

What is the relationship between volume (mL) and mass (grams) for water?▼

For pure liquid water at 4°C (its maximum density temperature), 1 milliliter (mL) or 1 cubic centimeter (cm³) of water has a mass of exactly 1.0 gram. Therefore, 1 Liter of water weighs 1 kilogram (2.20462 lbs), and 1 cubic meter of water weighs 1,000 kilograms (1 metric tonne).

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