Volume Converter β ml, Litres, Cups, Gallons & Fluid Ounces Explained
Learn how volume units like ml, litres, cups, fluid ounces, and gallons relate β including the US vs. UK difference β with real examples for cooking, fuel, medicine, and industry.
By sadiqbd Β· June 6, 2026
Volume units are a recipe for confusion β especially across borders
A US recipe calls for 2 cups. A UK recipe wants 300 ml. A chemical process uses litres. A fuel tank is in gallons. A spice jar is measured in teaspoons. Volume shows up in cooking, medicine, fuel, industry, and everyday shopping β and the units shift based on context and country.
The particularly tricky part of volume conversion is that the "same" unit isn't always the same: a US gallon (3.785 L) and a UK Imperial gallon (4.546 L) are different volumes. A US fluid ounce (29.57 ml) and a UK fluid ounce (28.41 ml) are different too. A volume converter handles all of these distinctions correctly.
The Main Volume Units
Metric
| Unit | Equivalent |
|---|---|
| Millilitre (ml) | base small unit |
| Centilitre (cl) | 10 ml |
| Decilitre (dl) | 100 ml |
| Litre (L) | 1,000 ml |
| Cubic metre (mΒ³) | 1,000 L |
| Cubic centimetre (cmΒ³ / cc) | 1 ml (exactly) |
Imperial / US
| Unit | US equivalent | UK equivalent |
|---|---|---|
| Teaspoon (tsp) | 4.93 ml | 5.92 ml |
| Tablespoon (tbsp) | 14.79 ml | 17.76 ml |
| Fluid ounce (fl oz) | 29.57 ml | 28.41 ml |
| Cup | 236.6 ml | 284.1 ml |
| Pint | 473.2 ml | 568.3 ml |
| Quart | 946.4 ml | 1,136.5 ml |
| Gallon | 3,785 ml (3.785 L) | 4,546 ml (4.546 L) |
How to Use the Volume Converter on sadiqbd.com
- Enter the volume value.
- Select the source unit β ml, litres, cups, fl oz, gallons (specify US or UK), etc.
- Select the target unit.
- Read the result β instant.
Real-World Examples
Following an international recipe
A recipe calls for 1.5 cups of milk. You measure in millilitres.
1.5 US cups Γ 236.6 ml = 354.9 ml β 355 ml
If the recipe is from a UK source: 1.5 UK cups Γ 284.1 = 426.2 ml β 71 ml more. Worth knowing which system the recipe uses.
Fuel and tank capacity
A motorbike fuel tank holds 12 litres. How many US gallons is that?
12 L Γ· 3.785 = 3.17 US gallons
If petrol costs ৳125/litre: 12 à 125 = ৳1,500 to fill from empty. If a road trip requires 25 litres total: 25 à 125 = ৳3,125 in fuel.
Medicine dosing
A paediatric syrup dose is 5 ml. In teaspoons (for a parent without a measuring syringe):
5 ml Γ· 4.93 ml/tsp = 1.01 teaspoons β 1 teaspoon (US)
Note: for medication, always use a proper measuring syringe β a kitchen teaspoon can vary from 3β7 ml depending on size and how it's filled. The "5 ml = 1 teaspoon" approximation is useful but not precise enough for exact dosing.
Industrial chemical volume
A manufacturing process requires 250 gallons of a solvent. Converting to litres for a metric supplier:
250 US gallons Γ 3.785 = 946.25 litres
Or in cubic metres: 946.25 L Γ· 1,000 = 0.946 mΒ³
Comparing beverage container sizes
A 330 ml can vs. a 12 fl oz (US) can: 12 Γ 29.57 = 354.84 ml
These are different sizes β a 12 fl oz can is about 25 ml larger than a 330 ml can. Both are common standards used simultaneously in different markets.
The US vs. UK Volume Problem in Detail
This is the most practically important distinction in volume conversion. The US and UK diverged on volume units in the 19th century, resulting in identically named but differently sized units.
| Unit | US | UK | Difference |
|---|---|---|---|
| Fluid ounce | 29.57 ml | 28.41 ml | ~4% |
| Cup | 236.6 ml | 284.1 ml | ~20% |
| Pint | 473.2 ml | 568.3 ml | ~20% |
| Gallon | 3,785 ml | 4,546 ml | ~20% |
The cup and pint differences are significant enough to matter in cooking and fuel calculations. A recipe "2 pints of stock" from a British cookbook requires 1,136 ml; from an American cookbook, only 946 ml. In baking, this gap can ruin a recipe.
Always check whether a recipe or spec is US or UK sourced before assuming which "cup" or "gallon" is meant.
Volume vs. Weight for Liquids
For water and water-like liquids, 1 ml β 1 gram. This makes volume and weight roughly interchangeable for water at room temperature β 250 ml of water weighs approximately 250 grams.
For other liquids, density varies:
- Honey: ~1,400 g/L (heavier than water)
- Cooking oil: ~920 g/L (lighter than water)
- Milk: ~1,030 g/L (slightly heavier than water)
If a recipe gives volume but you're measuring by weight (or vice versa), account for the liquid's density. The cooking converter handles common ingredient conversions.
Tips for Volume Conversions
Specify US or UK when "gallon," "pint," or "cup" is used. These terms are genuinely ambiguous without the qualifier. In an international context, always clarify.
Millilitres are universal. When in doubt, convert everything to ml for comparison. It's the metric standard that all other volume units map cleanly onto.
For fuel economy: litres per 100 km is more intuitive than gallons. Bangladesh fuel prices are per litre; km driven is your natural distance unit. Stick with litres and km rather than converting to gallons for fuel planning.
cc = ml exactly. Cubic centimetres and millilitres are the same volume (1 cmΒ³ = 1 ml by definition). Engine displacement in cc is the same number in ml β a 1,500 cc engine = 1.5 litres.
Frequently Asked Questions
How many ml in a cup? 1 US cup = 236.6 ml. 1 metric cup (used in Australia and some international recipes) = 250 ml. Specify which you're using.
Is a US gallon the same as a UK gallon? No. US gallon = 3.785 litres. UK Imperial gallon = 4.546 litres. The UK gallon is about 20% larger. Always check which system a recipe, fuel spec, or product listing uses.
How many litres in a cubic metre? 1 mΒ³ = 1,000 litres exactly. Used for large-scale water, gas, and industrial volume measurements.
Is 1 cc the same as 1 ml? Yes β exactly. 1 cubic centimetre = 1 millilitre by definition. The terms are interchangeable.
Is the volume converter free? Yes β completely free, no sign-up required.
Volume conversion is one of those tasks that seems simple until the US vs. UK distinction surfaces, or you're trying to convert an industrial quantity into cooking measurements. The converter handles every combination correctly and instantly.
Try the Volume Converter free at sadiqbd.com β instant conversion between ml, litres, cups, fl oz, gallons, and more.
