Universal Unit Converter
m, km, mi, ft, in, cm, mm, yd
kg, g, lb, oz, ton, 斤, 两
°C, °F, K with live thermometer
m², km², 亩, 公顷, acre
L, mL, gal, oz, cup
km/h, m/s, mph, knot
秒, 分, 时, 天, 周, 年
B, KB, MB, GB, TB
Pa, atm, bar, psi
J, kJ, cal, kWh
度, 弧度, 梯度
N, kN, kgf, lbf
UnitSwitch provides instant, accurate unit conversions for everyday needs. Simply select a category (length, weight, or temperature), enter your value, and see real-time results across all supported units. Available in English, Chinese, Japanese, Korean, and Spanish.
Convert between meters (m), kilometers (km), miles (mi), feet (ft), inches (in), centimeters (cm), millimeters (mm), and yards (yd). Common conversions: 1 mile = 1.60934 km, 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 yard = 0.9144 m. Useful for travel, construction, and everyday measurements.
Convert between kilograms (kg), grams (g), pounds (lb), ounces (oz), metric tons, 斤 (jin/catty), and 两 (liang). Special support for Chinese weight units: 1 斤 = 500g = 1.1023 lbs, 1 两 = 50g. Essential for cooking, shipping, and health tracking across different regional standards.
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with a visual thermometer display. Key formulas: °F = °C × 9/5 + 32, K = °C + 273.15. Quick references: Water freezes at 0°C/32°F, boils at 100°C/212°F. Normal body temperature is 37°C/98.6°F.
Most countries use the metric system (meters, kilograms, Celsius), which was developed during the French Revolution for universal standardization. The United States, Liberia, and Myanmar primarily use the imperial system (feet, pounds, Fahrenheit), largely due to historical convention. The UK uses a mix of both. China has its own traditional units (斤, 两) alongside metric.
A 斤 (jin), also known as a catty, is a traditional Chinese unit of weight equal to exactly 500 grams (0.5 kg). A pound (lb) is an imperial unit equal to approximately 453.6 grams. So 1 斤 is about 10% heavier than 1 pound. In Chinese daily life, 斤 is commonly used for buying food at markets. When Chinese recipes mention "一斤", they mean 500g.
For a quick mental estimate: double the Celsius value and add 30. For example, 20°C → 20×2+30 = 70°F (actual: 68°F). This shortcut is accurate within a few degrees for everyday temperatures. For exact conversion: multiply by 9, divide by 5, then add 32.
Kelvin (K) is the SI base unit of temperature used primarily in science and engineering. Unlike Celsius and Fahrenheit, Kelvin starts at absolute zero (−273.15°C), the theoretical lowest possible temperature where all molecular motion stops. It's used in physics, chemistry, astronomy, and color temperature for lighting/photography (e.g., 5500K = daylight).
No. A regular (statute) mile equals 1.60934 km, while a nautical mile equals 1.852 km — about 15% longer. Nautical miles are based on the Earth's geometry: one nautical mile equals one minute of latitude. They're used in marine and air navigation. UnitSwitch currently supports statute miles; nautical mile support is planned.
Yes! Once the page is loaded, all conversions happen locally in your browser using JavaScript. No internet connection is needed for the actual calculations. You can even bookmark the page for quick access. All conversion formulas are built into the page — no API calls are made.
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