About this calculator
This multi-category unit converter handles the most common conversions in length, weight, volume and speed, supporting both metric (SI) and imperial units.
Length: meters, kilometers, centimeters, millimeters, inches, feet, yards, miles. Weight: kilogram, gram, milligram, pound, ounce, ton. Volume: liters, milliliters, gallons (US/UK), pints, cups, fluid ounces. Speed: km/h, mph, m/s, knots.
Unit conversion is essential in cooking, travel, science, and engineering. Scientists use SI units, and many everyday situations still use the Imperial system. This converter makes switching between the two systems easy.
What it calculates
The unit converter changes values between units for length, mass, area, volume, temperature, speed, and other measurement categories.
Formula
General conversion: converted value = input value * conversion factor. Each measurement category uses its own factor.
Inputs
- Input value.
- Source unit.
- Target unit.
Example
| Conversion | Result | Note |
|---|---|---|
| 1 m to cm | 100 cm | Length |
| 1 kg to g | 1000 g | Mass |
| 1 L to mL | 1000 mL | Volume |
How to interpret the result
The converted result represents the same quantity in a different unit. Use one consistent unit system before doing further calculations.
Common mistakes
- Do not mix different measurement categories.
- Area and volume conversions require squared or cubed factors.
- Temperature conversion is usually not simple multiplication.
How to use
Using the unit converter is easy and convenient. First, select the physical quantity category you want to convert, such as length, mass, area, volume, temperature, etc. Then, select the original unit from the "From" drop-down menu and enter the value in the input box. Then, select the target unit in the "To" drop-down menu and click the "Convert" button to get the result.
For example, length conversion: Convert 5 feet to meters. Select the "Length" category, select "Feet (ft)" as the original unit, enter 5, and select "Meters (m)" as the target unit. The result shows: 5 ft = 1.524 m. Mass Conversion: Convert 150 pounds to kilograms. Result: 150 lb ≈ 68.04 kg. Temperature conversion: Convert 100 degrees Fahrenheit to degrees Celsius. Result: 100°F ≈ 37.78°C.
The converter supports real-time conversion, and you can see the result after entering the value. A reverse conversion function is also provided to swap original and target units with one click.
Main features
This unit converter is powerful and comprehensive. Supports unit conversion of 10 major categories of physical quantities: length, mass, area, volume, temperature, speed, time, pressure, energy, power, etc., covering hundreds of units. International standard conversion coefficients are used to ensure that the conversion results are accurate and reliable, with an accuracy of up to 10 decimal places.
Supports three major unit systems: metric, imperial, and American, as well as various professional units (such as navigation knots, astronomical light years, computer bytes, etc.). Provides quick conversion buttons for commonly used units to complete common conversions with one click. Real-time conversion function, results will be displayed as you enter, no need to wait. Supports reverse conversion, exchanging original units and target units with one click.
The interface is clear and the categories are clear, making it easy to find units. Completely free, no registration required, perfectly compatible with mobile and desktop.
Use cases
Unit converters are very useful in several real-world scenarios. In international trade and cross-border shopping, product specifications are often marked in different units. For example, American products are expressed in pounds, inches, and gallons, which need to be converted into kilograms, centimeters, and liters for intuitive understanding. When buying clothes and shoes, American sizes, European sizes, and Chinese sizes need to be converted.
When traveling abroad, learn the local measurements. Miles, degrees Fahrenheit, and gallons in the United States are different from kilometers, degrees Celsius, and liters in China. The converter helps you adapt quickly. Understand fuel consumption units (MPG vs L/100km) when renting a car. Convert temperature units when viewing the weather forecast.
In study and work, when reading English textbooks, scientific literature, and engineering drawings, we often encounter imperial units and need to convert them to familiar metric units. In scientific experiments, different instruments may use different units and need to be converted uniformly. In engineering design, international projects involve multiple unit systems.
When cooking and baking, foreign recipes commonly use units such as cups, ounces, and degrees Fahrenheit, which need to be converted into grams, milliliters, and degrees Celsius. When exercising to lose weight, indicators such as weight, height, and calories use different units in different regions. In real estate, conversion of area units (square meters, square feet, acres).