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Volume Conversion Overview
The Volume Conversion tool converts values between metric, SI, U.S. customary, Imperial, cubic-length, and selected engineering volume units. Enter a value in any supported unit to calculate the equivalent volume in the other units.
Volume measures the three-dimensional space occupied by a substance or object. The SI unit of volume is the cubic meter, symbol m3. The liter, symbol L, is accepted for use with SI and is equal to one cubic decimeter.
Unit names must be selected carefully. A U.S. gallon is not the same as an Imperial gallon, and a U.S. liquid pint is not the same as a U.S. dry pint. Cups, tablespoons, teaspoons, barrels, and drops may also use different definitions depending on country, industry, or application.
How to Use the Volume Converter
Find the input box for the unit you already know.
Enter the volume value.
Check whether the selected unit is metric, U.S. customary, Imperial, liquid, or dry measure.
Read the equivalent values displayed for the other units.
Round the result only after completing the conversion.
For cooking, medicine, trade, or regulated measurements, verify which regional definition applies.
General Volume Conversion Formula
A reliable way to convert between any two volume units is to use cubic meters as an intermediate reference:
Target value = Source value × Source factor in m3 / Target factor in m3
For example, one liter has a factor of 0.001 m3, while one milliliter has a factor of 0.000001 m3. Therefore:
1 L = 0.001 / 0.000001 = 1000 mL
SI and Metric Volume Units
| Unit | Symbol | Equivalent in Cubic Meters | Equivalent in Liters |
|---|---|---|---|
| Cubic kilometer | km3 | 1000000000 m3 | 1000000000000 L |
| Cubic meter | m3 | 1 m3 | 1000 L |
| Cubic decimeter | dm3 | 0.001 m3 | 1 L |
| Liter | L | 0.001 m3 | 1 L |
| Cubic centimeter | cm3 | 0.000001 m3 | 0.001 L |
| Milliliter | mL | 0.000001 m3 | 0.001 L |
| Cubic millimeter | mm3 | 0.000000001 m3 | 0.000001 L |
| Microliter | µL | 0.000000001 m3 | 0.000001 L |
| Nanoliter | nL | 0.000000000001 m3 | 0.000000001 L |
| Picoliter | pL | 0.000000000000001 m3 | 0.000000000001 L |
One milliliter, one cubic centimeter, and one cc represent the same volume. For technical writing, mL or cm3 is clearer than cc because the symbols are standardized and less ambiguous.
Liter Prefixes
| Unit | Symbol | Liters |
|---|---|---|
| Exaliter | EL | 1018 L |
| Petaliter | PL | 1015 L |
| Teraliter | TL | 1012 L |
| Gigaliter | GL | 109 L |
| Megaliter | ML | 106 L |
| Kiloliter | kL | 1000 L |
| Hectoliter | hL | 100 L |
| Dekaliter | daL | 10 L |
| Liter | L | 1 L |
| Deciliter | dL | 0.1 L |
| Centiliter | cL | 0.01 L |
| Milliliter | mL | 10-3 L |
| Microliter | µL | 10-6 L |
| Nanoliter | nL | 10-9 L |
| Picoliter | pL | 10-12 L |
| Femtoliter | fL | 10-15 L |
| Attoliter | aL | 10-18 L |
SI prefixes are case-sensitive. ML means megaliter, while mL means milliliter. Confusing uppercase M with lowercase m changes the value by a factor of one billion.
U.S. Liquid Volume Units
| U.S. Liquid Unit | Symbol | Equivalent Volume |
|---|---|---|
| U.S. gallon | gal | 3.785411784 L |
| U.S. liquid quart | qt | 0.946352946 L |
| U.S. liquid pint | pt | 0.473176473 L |
| U.S. cup | cup | 236.5882365 mL |
| U.S. fluid ounce | fl oz | 29.5735295625 mL |
| U.S. tablespoon | tbsp | 14.78676478125 mL |
| U.S. teaspoon | tsp | 4.92892159375 mL |
| U.S. gill | gi | 118.29411825 mL |
| U.S. fluid dram | fl dr | 3.6966911953125 mL |
| U.S. minim | min | 0.061611519921875 mL |
These are U.S. customary liquid measures. U.S. dry pints and dry quarts use different volumes and must not be substituted for the liquid versions.
U.S. Dry Volume Units
| U.S. Dry Unit | Equivalent Volume |
|---|---|
| Dry pint | 0.5506105 L |
| Dry quart | 1.101221 L |
| Peck | 8.809768 L |
| Bushel | 35.23907 L |
Imperial Volume Units
| Imperial Unit | Symbol | Equivalent Volume |
|---|---|---|
| Imperial gallon | gal | 4.54609 L |
| Imperial quart | qt | 1.1365225 L |
| Imperial pint | pt | 568.26125 mL |
| Imperial gill | gi | 142.0653125 mL |
| Imperial fluid ounce | fl oz | 28.4130625 mL |
| Imperial fluid dram | fl dr | 3.5516328125 mL |
| Imperial minim | min | 0.0591938802083 mL |
U.S. Gallon vs. Imperial Gallon
| Unit | Liters | Fluid Ounces in Its Own System |
|---|---|---|
| 1 U.S. gallon | 3.785411784 L | 128 U.S. fl oz |
| 1 Imperial gallon | 4.54609 L | 160 Imperial fl oz |
The Imperial gallon is approximately 20.1% larger than the U.S. gallon. However, the U.S. fluid ounce is slightly larger than the Imperial fluid ounce. Always retain the system label when reporting these units.
Cubic Length Units
| Unit | Equivalent Volume |
|---|---|
| 1 cubic inch | 16.387064 mL |
| 1 cubic foot | 28.316846592 L |
| 1 cubic yard | 0.764554857984 m3 |
| 1 cubic mile | 4168181825.44058 m3 |
| 1 acre-inch | 102.790153129 m3 |
| 1 acre-foot based on the international foot | 1233.48183754752 m3 |
Cubic conversion factors must be cubed. Because one foot equals 12 inches, one cubic foot equals 123, or 1728, cubic inches. Multiplying a linear conversion factor only once is a common volume-conversion error.
Selected Engineering and Commercial Units
| Unit | Definition or Equivalent Volume | Common Context |
|---|---|---|
| Petroleum barrel | 42 U.S. gallons = 158.987294928 L | Crude oil and petroleum products |
| Hundred cubic feet | 100 ft3 = 2.8316846592 m3 | Natural gas and utility measurement |
| Register ton | 100 ft3 = 2.8316846592 m3 | Ship internal volume, not mass |
| Cord | 128 ft3 = 3.624556363776 m3 | Stacked firewood volume |
| Board foot | 144 in3 = 2.359737216 L | Lumber volume |
| Stere | 1 m3 | Historical metric measure for stacked wood |
Units Supported by the Converter
Depending on the selected menu, the converter may include the following unit families:
SI cubic units: cubic kilometer, cubic meter, cubic decimeter, cubic centimeter, and cubic millimeter.
Liter units: exaliter through attoliter, including kiloliter, milliliter, microliter, nanoliter, and picoliter.
U.S. liquid units: gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon, dessertspoon, gill, fluid dram, and minim.
U.S. dry units: dry pint, dry quart, peck, and bushel.
Imperial units: gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon, dessertspoon, gill, fluid dram, and minim.
Cubic customary units: cubic mile, cubic yard, cubic foot, and cubic inch.
Land and utility units: acre-foot, acre-inch, hundred cubic feet, and ccf.
Commercial units: petroleum barrel, other named barrels, register ton, cord, board foot, tun, and hogshead.
Historical units: stere, dekastere, decistere, and selected ancient or regional measures.
Ambiguous and Context-Dependent Units
| Unit Name | Why It Needs Context |
|---|---|
| Gallon, quart, pint, and fluid ounce | U.S. and Imperial definitions are different. U.S. dry and liquid measures may also differ. |
| Cup | A U.S. customary cup, rounded U.S. nutrition or recipe cup, metric cup, and Imperial cup are not identical. |
| Tablespoon and teaspoon | Definitions vary by measurement system and culinary convention. |
| Drop | A drop is not a universal fixed volume. It depends on the liquid, opening, device, and applicable standard. |
| Barrel | Petroleum, liquid, dry commodity, and historical barrels can use different capacities. |
| Hogshead and tun | Historical and commodity-specific definitions vary. |
| Biblical and ancient measures | Modern equivalents are scholarly estimates rather than universally fixed standards. |
| Earth volume | This is an approximate scientific reference quantity, not a standardized measurement unit. |
For any ambiguous unit, use the exact definition stated by the source document, recipe, regulation, instrument, or supplier. A converter can calculate only the definition selected in its unit database.
Worked Conversion Examples
U.S. Gallons to Liters
Convert 2.5 U.S. gallons to liters:
2.5 × 3.785411784 = 9.46352946 L
Cubic Feet to Liters
Convert 1.2 ft3 to liters:
1.2 × 28.316846592 = 33.9802159104 L
Milliliters to U.S. Fluid Ounces
Convert 750 mL to U.S. fluid ounces:
750 / 29.5735295625 = 25.3605 U.S. fl oz
Liters to Cubic Centimeters
Convert 3.4 L to cubic centimeters:
3.4 × 1000 = 3400 cm3
Significant Digits and Rounding
A conversion factor may be exact while the measured input is not. The converted result should not imply more measurement precision than the original value supports. Keep extra digits during calculation, then round the final result to an appropriate number of significant digits.
For example, if a measured volume is reported as 2.5 gallons, presenting the result as 9.463529460 liters may suggest unrealistic precision. A practical result may be 9.5 L or 9.46 L, depending on the measurement uncertainty and intended use.
Common Volume Conversion Mistakes
Using a U.S. gallon factor for an Imperial gallon.
Confusing U.S. liquid pints with U.S. dry pints.
Treating a metric cup as identical to a U.S. customary cup.
Using a linear length factor instead of cubing it for volume.
Confusing mL with ML because SI symbols are case-sensitive.
Treating a fluid ounce as a unit of mass.
Assuming a drop or barrel always has one universal definition.
Rounding the intermediate value before the final conversion.
Reporting more significant digits than the input measurement supports.
Frequently Asked Questions
What is the SI unit of volume?
The SI unit of volume is the cubic meter, m3.
Is a liter an SI unit?
The liter is a non-SI unit accepted for use with SI. One liter equals one cubic decimeter or 0.001 cubic meter.
Is 1 mL equal to 1 cm3?
Yes. Both equal 0.000001 m3.
Is a U.S. gallon the same as a U.K. gallon?
No. A U.S. gallon is 3.785411784 L, while an Imperial gallon is 4.54609 L.
Are U.S. and Imperial fluid ounces equal?
No. A U.S. fluid ounce is approximately 29.57353 mL, while an Imperial fluid ounce is approximately 28.41306 mL.
Is a fluid ounce a unit of weight?
No. A fluid ounce measures volume. An ounce without the word fluid commonly refers to mass or weight, depending on context.
How many liters are in one cubic meter?
One cubic meter equals exactly 1000 liters.
Why can two conversion tools show different cup values?
They may be using different definitions, such as the U.S. customary cup, a rounded recipe cup, a metric cup, or an Imperial cup. Check the unit label and definition before comparing results.
Can volume be converted directly to mass?
Not without knowing the material's density and the relevant temperature or conditions. Volume and mass describe different physical quantities.
