Volume Converter
Convert litres, gallons, cups and other volumes; US and Imperial units are distinguished.
Enter a nonnegative number, for example 1.5. Decimal notation and exponents are supported; see Method for input limits.
Rounded display; exact calculation retained until you edit
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Rounded display
Batch: Auto uses the locale decimal convention with dot fallback; List splits commas/whitespace and uses dot decimals. Dot supports 1,234.5; Comma supports 1.234,5 with complete three-digit grouping only. Newline, semicolon and tab separate entries. Text cap 65536 UTF-16 units; candidate cap 300 speed / 500 volume includes invalid entries. Invalid/excess entries are omitted from exports with counts; no valid rows means no export.
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Method
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Scalar input: at most 256 UTF-16 units, 100 significant digits and exponent −100…100. Use complete decimal numbers; no suffixes or grouping in single mode. Dot is decimal; a decimal comma is also accepted only in comma-decimal locales. Negative quantities are rejected; zero is valid, empty is not zero.
Presentation rounds half away from zero. Storage uses at most 2/4/6/8 fractional places; other linear results use 8 significant digits, scientific below 0.0001 or at/above 1e15 for nonintegers. Exact integers stay complete. Copy/export uses ungrouped dot decimals. Computation is local except the currency rate request; surrounding site requests still exist.
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Method
Method: V₂ = V₁ × f₁ / f₂.
Reference · L / mL
| Units | Symbol | L | mL |
|---|---|---|---|
| Milliliters | mL | 0.001 | 1 |
| Centiliters | cL | 0.01 | 10 |
| Liters | L | 1 | 1000 |
| Teaspoons (US) | tsp | 0.00492892159375 | 4.92892159375 |
| Tablespoons (US) | tbsp | 0.01478676478125 | 14.78676478125 |
| Fluid Ounces (US) | fl oz | 0.0295735295625 | 29.5735295625 |
| Cups (US) | cup | 0.2365882365 | 236.5882365 |
| Pints (US) | pt | 0.473176473 | 473.176473 |
| Quarts (US) | qt | 0.946352946 | 946.352946 |
| Gallons (US) | gal (US) | 3.785411784 | 3 785.411784 |
| Gallons (UK) | gal (UK) | 4.54609 | 4 546.09 |
| Cubic Centimeters | cm³ | 0.001 | 1 |
| Cubic Meters | m³ | 1000 | 1 000 000 |
| Cubic Feet | ft³ | 28.316846592 | 28 316.846592 |
| Barrels (Oil) | bbl | 158.987294928 | 158 987.294928 |
Density and mass
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Density and mass · Reference
| Density and mass | kg/L | 1 L | 1 US gal |
|---|---|---|---|
| Water | 1.000 | 1.000 kg | 3.79 kg |
| Seawater | 1.025 | 1.025 kg | 3.88 kg |
| Milk | 1.03 | 1.03 kg | 3.90 kg |
| Olive oil | 0.918 | 0.918 kg | 3.48 kg |
| Petrol | 0.745 | 0.745 kg | 2.82 kg |
| Diesel | 0.832 | 0.832 kg | 3.15 kg |
| Ethanol | 0.789 | 0.789 kg | 2.99 kg |
| Honey | 1.42 | 1.42 kg | 5.38 kg |
| Sugar | 0.85 | 0.85 kg | 3.22 kg |
| Flour | 0.53 | 0.53 kg | 2.01 kg |
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Reference · US / Imperial
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Units · US / Imperial
| Units | US | Imperial / Reference | Reference |
|---|---|---|---|
| Teaspoons (US) · US | 4.92892 mL | 5 mL (Reference) | Reference · 5 / 15 mL |
| Tablespoons (US) · US | 14.7868 mL | 15 mL (Reference) | Reference · 5 / 15 mL |
| Fluid Ounces (US) · US | 29.5735 mL | 28.4131 mL | ≈ −4% |
| Cups (US) · US | 236.588 mL | 284.131 mL | ≈ +20% |
| Pints (US) · US | 473.176 mL | 568.261 mL | ≈ +20% |
| Quarts (US) · US | 946.353 mL | 1 136.52 mL | ≈ +20% |
| Gallons (US) | 3.785412 L | 4.54609 L | ≈ +20% |
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
About Volume Converter
This volume converter works from a single base unit — the litre — so every result comes from one multiplication and one division instead of a chain of rounded steps. Enter a value, pick its unit, and fifteen units update at once: millilitres, centilitres and litres, US teaspoons, tablespoons and fluid ounces, US cups, pints, quarts and gallons, the Imperial gallon, cubic centimetres, cubic metres, cubic feet, and the 42-gallon oil barrel.
The factors are the legal definitions, not textbook approximations. A US liquid gallon is defined as exactly 231 cubic inches, which since the 1959 international yard and pound agreement makes it exactly 3.785411784 L. The Imperial gallon has been exactly 4.54609 L since the Weights and Measures Act 1985. A US fluid ounce is one-128th of a US gallon, 29.5735295625 mL, and a US customary cup is eight of those, 236.5882365 mL. Because the tool divides by those numbers rather than by 3.79 or 29.6, a 500-gallon tank comes out as 1,892.706 L instead of drifting by several litres.
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Batch mode covers what a single conversion cannot. Paste a column of readings — tank dips, batch sizes, fuel deliveries — choose the source unit once, tick the units you want as columns, and copy the whole table into a spreadsheet or download it as CSV. The list is converted in the page itself, up to 500 rows at a time, so a tank-dip log converts as fast as a single reading.
1 L = 1000 mL = 1000 cm³; 1 US gal = 231 in³
Model · Rounded display
Use Cases
How to use
Type the volume you have into the Value field; decimals such as 2.5 and large numbers such as 50000 both work.
Choose the unit that value is in from the From list: mL, cL, L, US tsp, tbsp, fl oz, cups, pints, quarts, US or Imperial gallons, cm³, m³, ft³ or oil barrels.
Read the converted figure on every other row — the row matching your input unit stays highlighted.
Use the copy button on a row to take one figure, the swap arrow to make that unit the new input, or Batch convert to paste a whole column of values and download it as CSV.
Pro Tips
- Check whether your source is US or Imperial before you convert: the UK gallon (4.54609 L) is 20.1 % larger than the US gallon (3.785411784 L), and the UK pint is 568.26 mL against the US 473.18 mL.
- For a nutrition-facts panel use the legal cup of 240 mL set by 21 CFR 101.9, not the 236.5882365 mL customary cup this tool uses for recipes — the 3.4 mL gap shows up in a serving size.
- 1 cm³, 1 mL and 1 cc are the same volume, so lab, medical and engineering figures swap over with no arithmetic at all; 1 m³ is exactly 1,000 L.
- Press the swap arrow beside any row to make that unit the new input — useful when you have converted 5 gallons to litres and now want to carry on from the litre figure.
Troubleshooting
The result reads 1.2346e-5 instead of an ordinary number.
Presentation rounds half away from zero. Storage uses at most 2/4/6/8 fractional places; other linear results use 8 significant digits, scientific below 0.0001 or at/above 1e15 for nonintegers. Exact integers stay complete. Copy/export uses ungrouped dot decimals. Computation is local except the currency rate request; surrounding site requests still exist.
The litres here do not match the kilograms on my delivery note.
Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative.
Frequently Asked Questions
3 US gal = 11.356235352 L ≈ 11356.235 mL. Convert volume through exact litre factors.
A US liquid gallon is exactly 231 cubic inches, or 3.785411784 L. The Imperial gallon used in the UK has been exactly 4.54609 L since the Weights and Measures Act 1985. The Imperial gallon is 20.1 % larger, so 10 US gallons is only 8.327 Imperial gallons — a real gap on fuel-economy figures.
A US fluid ounce is 29.5735295625 mL, one-128th of a US gallon. The Imperial fluid ounce is different: 28.4130625 mL, one-160th of an Imperial gallon. So a 12 fl oz US can holds 355 mL, while 12 Imperial fl oz is 341 mL. This converter uses the US fluid ounce.
Yes, exactly. The litre is defined as one cubic decimetre, so 1 L = 1,000 cm³ and 1 mL = 1 cm³ = 1 cc. A 250 cm³ beaker holds 250 mL, and 1 m³ is exactly 1,000 L. That equality has been exact since 1964, when the older litre definition based on the mass of water was dropped.
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
One cubic foot is 28.316846592 L, or 7.4805 US gallons; the figure follows from the exact 0.3048 m foot. A 40 ft³ sump holds 1,132.67 L. Going the other way, 1 m³ is 35.3147 ft³, which is why shipping and HVAC specs quoted in cubic feet look so much larger than their metric equivalents.
No. A US customary cup is 236.5882365 mL, the US nutrition-label cup is 240 mL, the metric cup used in Australia and New Zealand is 250 mL, and older British recipes may mean 284 mL, half an Imperial pint. Across a four-cup batch the US-to-metric gap alone is about 54 mL, enough to change a batter.
Not directly: they are different dimensions, m³ against m². You only get an area once you fix a depth, with area = volume ÷ depth. Spreading 2 m³ of gravel 50 mm deep covers 2 ÷ 0.05 = 40 m². The same rule turns litres of paint into coverage once the spread rate is known.
A rectangular tank is length × width × height; a cylinder is π × radius² × height. Work in metres and the answer is cubic metres, which this converter turns into litres or gallons. A cylinder 0.6 m across and 1.2 m tall is π × 0.3² × 1.2 = 0.339 m³ = 339 L = 89.6 US gallons. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL. A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Convert volume through exact litre factors. US customary liquid units are used for teaspoons, tablespoons, fluid ounces, cups, pints and quarts. 1 US gallon = 231 in³ = 3.785411784 L; 1 Imperial gallon = 4.54609 L. 1 US cup = 236.5882365 mL, distinct from nutrition 240 mL and metric 250 mL.
A petroleum barrel is 42 US gallons. 1 L = 1000 mL = 1000 cm³. Fluid ounces measure volume, not mass; mass needs substance- and temperature-dependent density. Density tables are illustrative. Tank geometry is not calculated here; regional spoon sizes must be checked separately.
Batch: Auto uses the locale decimal convention with dot fallback; List splits commas/whitespace and uses dot decimals. Dot supports 1,234.5; Comma supports 1.234,5 with complete three-digit grouping only. Newline, semicolon and tab separate entries. Text cap 65536 UTF-16 units; candidate cap 300 speed / 500 volume includes invalid entries. Invalid/excess entries are omitted from exports with counts; no valid rows means no export.
Reference · NIST / BIPM
Reference · NIST SP 811 / BIPM / 231 in³ / 4.54609 L
- NIST Special Publication 811, Appendix B.8 — factors for units listed alphabetically
- BIPM, Resolution 6 of the 12th CGPM (1964) — “litre” as a special name for the cubic decimetre
- Weights and Measures Act 1985, Schedule 1 — the Imperial gallon as 4.54609 litres
- eCFR 21 CFR 101.9 — the 240 mL cup used on US nutrition labels