182+ conversions · 14 units
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Welcome to the ConvertNow volume converter hub. Whether you are a student solving homework, a professional completing a project, or a traveller navigating unfamiliar units, our free volume conversion tools give you instant, accurate results backed by internationally verified constants.
Volume was initially measured with grain, jugs, and gills. The litre was defined in 1795 as one cubic decimetre. The US gallon derives from the British wine gallon (231 cubic inches), while the imperial gallon was standardised at 4.54609 litres in 1824. These differences still cause confusion between US and UK recipes.
Volume conversion prevents recipe disasters, chemical reactions, and fuel miscalculations. Mixing 500 mL of acid with 500 mL of water differs from mixing 500 mL with 500 fl oz. Fuel tank capacities confuse travellers renting cars abroad.
Chemists, bartenders, bakers, fuel station attendants, pharmacists, and aquarium hobbyists.
US vs imperial gallons (3.785 L vs 4.546 L) and metric cups (250 mL) vs US cups (240 mL). A UK recipe using "1 cup" measured with a US cup loses 4 % accuracy.
| Unit | Symbol | Base Equivalent | Common Use |
|---|---|---|---|
| Litre | L | 1 L = 1 dm³ | Global |
| Millilitre | mL | 0.001 L | Global |
| Gallon (US) | gal | 3.785 L | US |
| Gallon (UK) | gal | 4.546 L | UK, Ireland |
| Cup (US) | cup | 240 mL | US cooking |
| Fluid Ounce (US) | fl oz | 29.57 mL | US |
| Common Value | Equals |
|---|---|
| 1 gallon (US) | 3.785 L |
| 1 cup (US) | 240 mL |
| 1 tbsp (US) | 15 mL |
| 1 litre | 0.264 gal |
The US fluid ounce is 29.57 mL; the UK fluid ounce was historically 28.41 mL. This difference comes from the separate gallon definitions.
Approximately 4.23 US cups (240 mL each) per litre, or exactly 4 metric cups (250 mL each).
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