Universal Unit Converter
Convert between metric (SI), imperial (US), and other measurement systems instantly. Whether you're cooking with a foreign recipe, traveling internationally, working on engineering projects, or comparing product specifications, this converter handles all your unit conversion needs with precision.
Understanding Unit Systems
Metric System (SI)
The International System of Units is used by most countries worldwide. It's based on powers of 10, making conversions straightforward (1 kilometer = 1000 meters). Scientists and engineers prefer metric for its consistency.
Imperial/US Customary
Used primarily in the United States, this system has historical roots in British units. Conversions are less intuitive (1 mile = 5,280 feet), but these units remain standard in American daily life, construction, and manufacturing.
Supported Unit Categories
Length/Distance
| Unit | Symbol | Relative to Meter |
|---|
| Kilometer | km | 1,000 m |
| Meter | m | 1 m |
| Centimeter | cm | 0.01 m |
| Millimeter | mm | 0.001 m |
| Mile | mi | 1,609.34 m |
| Yard | yd | 0.9144 m |
| Foot | ft | 0.3048 m |
| Inch | in | 0.0254 m |
Weight/Mass
| Unit | Symbol | Relative to Kilogram |
|---|
| Metric ton | t | 1,000 kg |
| Kilogram | kg | 1 kg |
| Gram | g | 0.001 kg |
| Milligram | mg | 0.000001 kg |
| Pound | lb | 0.453592 kg |
| Ounce | oz | 0.0283495 kg |
| Stone | st | 6.35029 kg |
Temperature
Temperature conversions require formulas, not simple multiplication:
| Conversion | Formula |
|---|
| Celsius → Fahrenheit | °F = (°C × 9/5) + 32 |
| Fahrenheit → Celsius | °C = (°F - 32) × 5/9 |
| Celsius → Kelvin | K = °C + 273.15 |
| Kelvin → Celsius | °C = K - 273.15 |
Quick reference: 0°C = 32°F = 273.15K (freezing point of water)
Volume
| Unit | Symbol | Relative to Liter |
|---|
| Cubic meter | m³ | 1,000 L |
| Liter | L | 1 L |
| Milliliter | mL | 0.001 L |
| US Gallon | gal | 3.78541 L |
| US Quart | qt | 0.946353 L |
| US Pint | pt | 0.473176 L |
| US Cup | cup | 0.236588 L |
| US Fluid Ounce | fl oz | 0.0295735 L |
Note: UK/Imperial gallons differ from US gallons (1 UK gal = 4.546 L).
Digital Storage
| Unit | Symbol | Bytes |
|---|
| Bit | b | 0.125 bytes |
| Byte | B | 1 byte |
| Kilobyte | KB | 1,000 bytes |
| Megabyte | MB | 1,000,000 bytes |
| Gigabyte | GB | 1,000,000,000 bytes |
| Terabyte | TB | 1,000,000,000,000 bytes |
Binary vs Decimal: Some systems use 1 KB = 1,024 bytes (binary). This converter uses the SI decimal standard (1 KB = 1,000 bytes).
Speed
| Unit | Conversion |
|---|
| m/s → km/h | × 3.6 |
| km/h → mph | × 0.621371 |
| mph → knots | × 0.868976 |
| knots → m/s | × 0.514444 |
Area, Pressure, Energy
Additional categories support conversions for:
- Area: Square meters, feet, acres, hectares
- Pressure: Pascal, bar, PSI, atmospheres
- Energy: Joules, calories, watt-hours, BTU
Common Conversion Reference
| Conversion | Factor | Example |
|---|
| Miles → Kilometers | × 1.60934 | 10 mi = 16.09 km |
| Kilometers → Miles | × 0.621371 | 10 km = 6.21 mi |
| Pounds → Kilograms | × 0.453592 | 150 lb = 68.04 kg |
| Kilograms → Pounds | × 2.20462 | 70 kg = 154.32 lb |
| Gallons → Liters | × 3.78541 | 5 gal = 18.93 L |
| Liters → Gallons | × 0.264172 | 20 L = 5.28 gal |
| Feet → Meters | × 0.3048 | 6 ft = 1.83 m |
| Meters → Feet | × 3.28084 | 2 m = 6.56 ft |