Volume Converter
A volume converter turns a quantity of space into another unit: multiply by the source unit's size in litres, then divide by the target unit's. Example: 2 US gallons × 3.785411784 = 7.570824 litres, which is 7,570.82 mL, 256 US fluid ounces or 0.2674 cubic feet.
Converted Values
Copying failed. Your browser blocked clipboard access, so select the values and copy them by hand.
Paste one value per line. They are all read as the unit selected above.
Number format
Output columns
Copying failed. Your browser blocked clipboard access, so select the values and copy them by hand.
How do you convert volume units?
Every conversion on this page goes through the litre. Multiply your figure by the source unit in litres, then divide by the target unit in litres — one multiplication, one division, no rounding in between. Converting 750 mL to US fluid ounces: 750 × 0.001 = 0.75 L, then 0.75 ÷ 0.0295735295625 = 25.36 fl oz. The table below is the full factor list the calculator uses.
Volume conversion table: every unit in litres and millilitres
| Unit | Symbol | In litres | In millilitres |
|---|---|---|---|
| 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 |
How do you convert volume to weight in kg?
Volume to mass is not a unit conversion — litres and kilograms measure different things. You need the density of the substance: mass = volume × density. Water is the only common liquid where 1 L is 1 kg. Convert your figure to litres here, then multiply by a density from this table.
Density table: what one litre and one US gallon weigh
| Substance | Density (kg/L) | 1 litre weighs | 1 US gallon weighs |
|---|---|---|---|
| Water (4 °C) | 1.000 | 1.000 kg | 3.79 kg |
| Seawater | 1.025 | 1.025 kg | 3.88 kg |
| Whole milk | 1.03 | 1.03 kg | 3.90 kg |
| Olive oil | 0.918 | 0.918 kg | 3.48 kg |
| Petrol / gasoline | 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 |
| Granulated sugar (bulk) | 0.85 | 0.85 kg | 3.22 kg |
| All-purpose flour (bulk) | 0.53 | 0.53 kg | 2.01 kg |
Water through honey are liquid densities and move only slightly with temperature. The last two rows are bulk densities: sifting, scooping and packing change how much air sits between the grains, so a cup of flour can weigh noticeably more or less than the figure above. Treat them as typical values and weigh dry ingredients whenever the recipe depends on it.
What is the difference between US and Imperial (UK) volume units?
Pints, quarts, gallons and fluid ounces exist in two incompatible systems. The Imperial units used in the UK are about 20 % larger than their US namesakes, except the fluid ounce, which is slightly smaller. This converter uses US customary units for tsp, tbsp, fl oz, cup, pint and quart, and offers both gallons.
US customary vs Imperial (UK) volume units
| Unit | US customary | Imperial (UK) | Difference |
|---|---|---|---|
| Teaspoon | 4.92892 mL | 5 mL (metric spoon) | Metric, not Imperial; 1.4 % larger than the US spoon |
| Tablespoon | 14.7868 mL | 15 mL (metric spoon) | Metric, not Imperial; 1.4 % larger than the US spoon |
| Fluid ounce | 29.5735 mL | 28.4131 mL | UK 3.9 % smaller |
| Cup (recipe) | 236.588 mL | 284.131 mL | UK 20.1 % larger |
| Pint | 473.176 mL | 568.261 mL | UK 20.1 % larger |
| Quart | 946.353 mL | 1 136.52 mL | UK 20.1 % larger |
| Gallon | 3.785412 L | 4.54609 L | UK 20.1 % larger |
Every row of the UK column is the Imperial unit except the spoons: British kitchens measure with metric 5 mL and 15 mL spoons, so there is no Imperial spoon size in modern use. Those two rows are the British sizes only — other countries that metricated set their own spoon sizes, so check where a recipe comes from before you trust a spoon. The 284.131 mL cup is half an Imperial pint and appears only in older British recipes; recipes written today weigh dry ingredients in grams or use a 250 mL metric cup.
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.
Three things trip people up, and each has its own section on this page. US and Imperial units share names but not sizes: an Imperial pint is 568.26 mL against the US 473.18 mL, so a British recipe asking for a pint of stock wants about 20 % more liquid than an American one. Fluid ounces measure space while ounces measure mass — they only coincide for water, and only roughly. And converting volume to kilograms is not a unit conversion at all: it needs a density, so the density table below gives kg per litre for water, fuels and common kitchen ingredients.
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.
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.
- Never treat fluid ounces as ounces of weight. Use mass = volume × density: 1 L of water is 1.000 kg, but 1 L of olive oil is 0.918 kg and 1 L of honey about 1.42 kg.
- 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.
Results below 0.0001 switch to scientific notation so no precision is lost: 1.2346e-5 L means 0.000012346 L. Convert into a smaller unit — millilitres or cubic centimetres — to get a readable figure. Large results stay plain, so 5,000 L is written 5000000 mL; only figures of 1e15 and above take exponent form.
The litres here do not match the kilograms on my delivery note.
A delivery note states mass, not volume. Divide by the density: 1,000 kg of diesel at 0.832 kg/L is 1,000 ÷ 0.832 = 1,202 L, not 1,000 L. Only water is close to 1 kg per litre, and even that shifts with temperature.
Frequently Asked Questions
Multiply by the source unit's size in litres, then divide by the target unit's. Converting 3 US gallons to millilitres: 3 × 3.785411784 = 11.356235 L, then ÷ 0.001 = 11,356.24 mL. Using the exact factor rather than 3.79 keeps tank and tanker figures accurate to the litre.
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.
Volume and mass are different quantities, so you need a density: mass = volume × density. Water is 1.000 kg/L, milk about 1.03, olive oil 0.918, honey 1.42 and petrol 0.745 kg/L. Five litres of petrol therefore weighs 5 × 0.745 = 3.73 kg, not 5 kg. The density table above lists the usual figures.
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.
A standard US oil barrel (bbl) is 42 US gallons: 158.987294928 L, or 0.158987 m³. It is not the 55-gallon (208.2 L) steel drum used for shipping, and not the 36-gallon UK beer barrel. Crude oil prices are always quoted per 42-gallon barrel, so this is the row to use on an energy spreadsheet.
Sources and standards
The factors on this page are traceable to these published definitions:
- 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