Volume Converter
Convert between metric and imperial volume units — liters, gallons, cups, milliliters, cubic meters, and more
Unit Converter
Support fast conversion of various units including length, area, volume, weight, temperature, etc.
Common Units
Common Unit Conversions
Quick reference for frequently used unit conversions
Length
| From | To | Formula | Example |
|---|---|---|---|
| Inches (in) | Centimeters (cm) | in × 2.54 | 1 in = 2.54 cm |
| Feet (ft) | Meters (m) | ft × 0.3048 | 1 ft = 0.3048 m |
| Miles (mi) | Kilometers (km) | mi × 1.609 | 1 mi = 1.609 km |
| Meters (m) | Feet (ft) | m × 3.281 | 1 m = 3.281 ft |
| Kilometers (km) | Miles (mi) | km × 0.621 | 1 km = 0.621 mi |
Weight / Mass
| From | To | Formula | Example |
|---|---|---|---|
| Ounces (oz) | Grams (g) | oz × 28.35 | 1 oz = 28.35 g |
| Pounds (lb) | Kilograms (kg) | lb × 0.454 | 1 lb = 0.454 kg |
| Kilograms (kg) | Pounds (lb) | kg × 2.205 | 1 kg = 2.205 lb |
| Tons (t) | Tonnes (t) | t × 0.907 | 1 t = 0.907 tonnes |
Volume
| From | To | Formula | Example |
|---|---|---|---|
| Fl oz (US) | Milliliters (ml) | fl oz × 29.574 | 1 fl oz = 29.574 ml |
| Cups (US) | Milliliters (ml) | cup × 236.588 | 1 cup = 236.588 ml |
| Pints (US) | Liters (L) | pt × 0.473 | 1 pt = 0.473 L |
| Gallons (US) | Liters (L) | gal × 3.785 | 1 gal = 3.785 L |
| Liters (L) | Gallons (US) | L × 0.264 | 1 L = 0.264 gal |
Temperature
| From | To | Formula | Example |
|---|---|---|---|
| Celsius (°C) | Fahrenheit (°F) | (°C × 9/5) + 32 | 0°C = 32°F |
| Fahrenheit (°F) | Celsius (°C) | (°F - 32) × 5/9 | 32°F = 0°C |
| Celsius (°C) | Kelvin (K) | °C + 273.15 | 0°C = 273.15 K |
| Kelvin (K) | Celsius (°C) | K - 273.15 | 273.15 K = 0°C |
Area
| From | To | Formula | Example |
|---|---|---|---|
| Sq feet (ft²) | Sq meters (m²) | ft² × 0.0929 | 1 ft² = 0.0929 m² |
| Sq meters (m²) | Sq feet (ft²) | m² × 10.764 | 1 m² = 10.764 ft² |
| Acres | Hectares (ha) | acre × 0.405 | 1 acre = 0.405 ha |
| Hectares (ha) | Acres | ha × 2.471 | 1 ha = 2.471 acres |
Speed
| From | To | Formula | Example |
|---|---|---|---|
| MPH | KM/H | mph × 1.609 | 1 mph = 1.609 km/h |
| KM/H | MPH | km/h × 0.621 | 1 km/h = 0.621 mph |
| Knots | MPH | knots × 1.151 | 1 knot = 1.151 mph |
| M/S | KM/H | m/s × 3.6 | 1 m/s = 3.6 km/h |
Note: These are commonly used conversions with approximate values rounded for practical use. For precise conversions, use the calculator tool above.
Unit Conversion Reference Table
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What is Volume Conversion?
Volume conversion translates a capacity measurement from one unit to another — liters to gallons, cups to milliliters, and so on. It is essential for cooking, fuel calculations, chemistry, and any task that involves measuring liquids or containers.
Three systems coexist, and this is where confusion often begins. The metric system (liters, milliliters, cubic meters) is clean and powers-of-ten based. The US customary system (gallons, quarts, cups, fluid ounces) uses nested ratios (4 cups = 1 quart, 4 quarts = 1 gallon). The imperial system (UK) looks similar but uses different sizes — an imperial gallon is 20% larger than a US gallon.
The distinction between volume and capacity matters in science: volume is the space an object occupies, capacity is how much a container holds. In everyday use they are the same, and this converter handles both.
How to Convert Volume Units
Each volume unit has a conversion rate relative to a base unit (the cubic meter). The formula:
result = value × (fromUnit rate) ÷ (toUnit rate)
Example — convert 2 US gallons to liters:
2 gal(US) = 2 × 0.003785 ÷ 0.001 = 7.57 L
Key tip: Always confirm whether a recipe or manual means US or imperial units — a US cup (240 ml) and imperial cup (284 ml) differ enough to ruin a recipe. The converter above labels each clearly.
Common Volume Conversions
| From | To | Multiply by |
|---|---|---|
| Gallon (US) | Liter | 3.785 |
| Gallon (imperial) | Liter | 4.546 |
| Cup (US) | Milliliter | 236.6 |
| Fluid ounce (US) | Milliliter | 29.57 |
| Liter | US quart | 1.057 |
Frequently Asked Questions
How many liters are in a gallon?
A US gallon holds 3.785 liters, while an imperial (UK) gallon holds 4.546 liters. Always check which gallon is meant — US recipes and fuel use the smaller US gallon. To convert US gallons to liters, multiply by 3.785; to convert liters to US gallons, multiply by 0.264.
What is the difference between a US gallon and an imperial gallon?
The US gallon (3.785 L) is based on the historical English wine gallon. The imperial gallon (4.546 L) was defined in 1824 by the British as the volume of 10 pounds of water at a specific temperature. The imperial gallon is about 20% larger. This is why UK fuel economy figures look different from US ones for the same car.
How many milliliters are in a cup?
A US customary cup equals 240 milliliters (exactly 236.588 ml, often rounded to 240 ml in nutrition labeling). A metric cup is exactly 250 ml. An imperial cup is 284 ml. Recipes from different countries use different cup sizes, which is a common source of baking errors.
How do I convert fluid ounces to milliliters?
One US fluid ounce equals 29.574 milliliters. To convert, multiply fluid ounces by 29.57. An imperial fluid ounce is slightly smaller at 28.413 ml. Note that a fluid ounce (fl oz) measures volume, while a regular ounce (oz) measures weight — they are not the same.
How many quarts are in a liter?
One liter equals 1.057 US quarts, so a liter is slightly more than a quart. To convert liters to US quarts, multiply by 1.057. There are 4 quarts in a US gallon, and 2 pints in a quart. The metric system avoids these nested ratios by using a simple powers-of-ten relationship between liters and milliliters.