VolumeConverter
Instantly convert volume units including Milliliter, Liter, and more.
About Volume Units
Volume measures the three-dimensional space a substance occupies. The SI unit is the cubic meter (m³), but for everyday liquid quantities the liter (L) is standard — 1 L = 1 dm³ = 0.001 m³. The US customary cooking system uses teaspoons, tablespoons, cups, fluid ounces, pints, quarts, and gallons, creating a detailed vocabulary for the kitchen. Beneath this apparent variety lies a critical trap: the US and UK share most of these names but assign them different values. A US gallon (3.785 L) differs from a UK imperial gallon (4.546 L) by more than 20%.
The story of volume measurement is one of persistent divergence between the US and the UK. Both countries inherited a common colonial system, but the UK's 1824 Weights and Measures Act redefined the imperial gallon as the volume of exactly 10 pounds of distilled water at 62 °F (about 4.546 L), while the US retained its older colonial wine gallon of 231 cubic inches (about 3.785 L). This single legislative decision created a permanent split that affects cooking recipes, fuel pricing, and trade to this day. Meanwhile, the metric world settled on the liter, which was redefined in 1964 to be exactly one cubic decimeter.
Volume conversion matters in the kitchen, the laboratory, and industry. A British cook following an American recipe for a gallon of soup needs to reduce the amount, not increase it. A pharmacist converting a 250 mL IV fluid bag to fluid ounces must use the US fluid ounce (29.57 mL), not the UK version (28.41 mL). Homebrewers converting European recipes (liters) to American batches (gallons) face the same unit ambiguity. In manufacturing and fuel retail, specifying 'gallons' without clarifying US or imperial can cause multi-million-dollar errors in international supply contracts.
Common Volume Conversions
| From | To |
|---|---|
| 1 US gallon | 3.785 L — 128 US fl oz |
| 1 UK gallon | 4.546 L — 160 UK fl oz |
| 1 liter | 1,000 mL — 33.814 US fl oz |
| 1 US cup | 236.588 mL |
| 1 US tablespoon | 14.787 mL |
| 1 US teaspoon | 4.929 mL |
| 1 US pint | 473.176 mL — 2 cups |
| 1 US quart | 946.353 mL — 2 pints |
| 1 US fl oz | 29.574 mL |
| 1 mL | 1 cm³ — 0.0338 US fl oz |
| 1 m³ | 1,000 L — 264.172 US gal |
| 1 UK pint | 568.261 mL |
| 1 US cup | 16 US tbsp — 48 US tsp |
| 1 L | 4.227 US cups — 2.113 US pints |
| 1 US gallon | 4 quarts — 8 pints — 16 cups |
Frequently Asked Questions
One US teaspoon equals approximately 4.929 mL. In the UK and metric cooking, a teaspoon is usually rounded to exactly 5 mL.
Approximately 4.227 US cups fit in one liter. If using metric cups (250 mL), there are exactly 4 metric cups per liter.
The US kept the pre-1824 colonial wine gallon (231 in³ ≈ 3.785 L) when it gained independence. The UK redefined its gallon in 1824 as the volume of 10 lb of distilled water at 62 °F (≈ 4.546 L). Both are valid, but the difference — about 20% — causes confusion in recipes and fuel pricing.
Exactly 1,000 liters equal one cubic meter, since 1 L = 1 dm³ and 1 m³ = 1,000 dm³.
One liter equals approximately 33.814 US fluid ounces, or 35.195 UK fluid ounces. The difference matters: if a recipe calls for 1 liter of liquid and you use UK fl oz, you would measure 35 oz; US fl oz would give 33.8.
A fluid ounce (fl oz) measures volume (≈ 29.57 mL), while an (avoirdupois) ounce measures mass (≈ 28.35 g). They are not interchangeable. Water happens to be close: 1 fl oz of water weighs about 29.6 g, but the units remain conceptually and numerically distinct.
There are exactly 16 US cups in one US gallon (4 quarts × 2 pints × 2 cups = 16 cups). This chain also means: 1 gal = 4 qt = 8 pt = 16 cups = 128 fl oz.
A US pint equals 473.176 mL (16 US fl oz). A UK imperial pint equals 568.261 mL (20 UK fl oz). That is about 20% more. When ordering a pint of beer in a London pub, you receive 568 mL; in a New York bar, only 473 mL.