Volume Converter
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By Katherine WellsReviewed by Dr. Robert Chen, PhD (Chemical Engineering)Published: Updated:
References
- [1]Bureau International des Poids et Mesures (BIPM), The International System of Units (SI) - 9th Edition, 2019. https://www.bipm.org/en/publications/si-brochure
- [2]National Institute of Standards and Technology (NIST), NIST Guide for the Use of the International System of Units (SI), 2008. https://physics.nist.gov/cuu/pdf/sp811.pdf
- [3]International Organization for Standardization (ISO), ISO 80000-1: Quantities and Units - Part 1: General, 2022.
How to Use?
- 1
Enter the volume value
Type the numeric value you want to convert into the Value field.
- 2
Select the source unit
Choose the unit of your input value from the unit dropdown: mL, tsp, tbsp, fl oz, cup, pt, qt, L, gal, in³, cm³, or m³.
- 3
Choose the display unit
Use the Display Result In dropdown to select which unit appears highlighted as the primary result.
- 4
Review the result
The result panel shows your value in the chosen display unit, with all other supported units listed as alternatives below it.
- 5
Cross-check key conversions
Use the reference table to verify common factors: 1 L = 1.057 qt, 1 gal = 3.785 L, 1 cup = 236.6 mL.
- 6
Explore related converters
Use the length, temperature, or pressure converters linked on this page for additional unit conversion needs.
Worked Examples
1Convert 1 litre to US gallons
Given Values
volumeValue:1
volumeValue_unit:l
Results
l:1
2Convert 2 cups to millilitres
Given Values
volumeValue:2
volumeValue_unit:cup
Results
l:0.473176
3Convert 5 gallons to litres
Given Values
volumeValue:5
volumeValue_unit:gal
Results
l:18.927
4Convert 500 mL to fluid ounces
Given Values
volumeValue:500
volumeValue_unit:ml
Results
l:0.5
5Convert 1 quart to millilitres
Given Values
volumeValue:1
volumeValue_unit:qt
Results
l:0.946353
6Convert 3 teaspoons to millilitres
Given Values
volumeValue:3
volumeValue_unit:tsp
Results
l:0.0147868
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Frequently Asked Questions
One litre equals exactly 1,000 millilitres. This is a core relationship of the metric volume system. To convert litres to millilitres, multiply by 1,000. To convert millilitres to litres, divide by 1,000.
One US teaspoon equals approximately 4.92892 millilitres. For most cooking purposes, 1 tsp is rounded to 5 mL. The conversion is defined through the US customary system: 1 tsp = 1/6 fl oz = 4.92892 mL exactly.
One US tablespoon equals approximately 14.7868 millilitres. In cooking, 1 tbsp is often rounded to 15 mL. Three teaspoons make one tablespoon, so 1 tbsp = 3 × 4.92892 mL = 14.7868 mL.
One US cup equals exactly 8 fluid ounces. Since 1 fl oz = 29.5735 mL, this means 1 cup = 8 × 29.5735 mL = 236.588 mL. In metric countries, a cup is often defined as 250 mL, creating a 5.4% difference.
One US quart contains exactly 4 cups. This follows the US customary hierarchy: 1 qt = 2 pt = 4 cups = 32 fl oz = 0.946353 L.
One US gallon contains exactly 4 quarts. One quart is 0.946353 L, so 1 gal = 4 × 0.946353 L = 3.78541 L. This relationship is used in engine oil specifications, paint volumes, and bulk beverage containers.
One US quart contains exactly 2 pints. One US pint equals 473.176 mL. This differs from the UK Imperial pint (568 mL), so always verify which pint standard a recipe or specification uses.
A US gallon equals 3.78541 litres, while a UK Imperial gallon equals 4.54609 litres – about 20% larger. The UK gallon is defined as the volume of 10 pounds of water at 62°F. This converter uses US gallons. To convert US gallons to UK gallons, multiply by 0.83267.
One cubic centimetre (cm³) equals exactly one millilitre (mL). They are the same volume expressed in different units. The litre is defined as exactly 1,000 cm³, so 1 mL = 1 cm³. Use cm³ for solid volumes and engine displacement, and mL for liquids.
One cubic metre (m³) equals exactly 1,000 litres. This is because 1 m³ = 1,000,000 cm³ and 1 L = 1,000 cm³, so 1 m³ = 1,000,000 / 1,000 = 1,000 L. Cubic metres are used for large volumes like water tanks, shipping containers, and reservoir capacities.
One litre equals approximately 61.0237 cubic inches. This conversion is commonly used in automotive engineering to express engine displacement. A 5.7 L engine displaces 5.7 × 61.0237 = 347.8 in³, often rounded to 350 cubic inches.
A fluid ounce (fl oz) measures volume, while an ounce (oz) measures weight. One US fluid ounce of water at room temperature weighs approximately 1.043 ounces. This distinction matters in cooking and chemistry: 8 fl oz of milk is not the same as 8 oz of milk by weight, because density differs from water.
Multiply the displacement in litres by 61.0237 to get cubic inches. For example, a 2.0 L engine is 2.0 × 61.0237 = 122 in³. Common conversions: 5.7 L ≈ 350 in³, 6.2 L ≈ 378 in³, 4.6 L ≈ 281 in³. This converter handles the calculation instantly.
Most substances expand when heated and contract when cooled, a phenomenon called thermal expansion. Water has a coefficient of volumetric expansion of about 0.000214 per °C, so 1 L at 20°C becomes about 1.00043 L at 22°C. Volumetric glassware is calibrated at 20°C, and measurements at other temperatures should be corrected for high-precision work.
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