单位换算计算器

What is Unit Conversion?

Unit conversion is the process of changing a quantity expressed in one unit of measurement to an equivalent quantity expressed in a different unit of measurement. This is essential in science, engineering, commerce, and everyday life.

Conversions can be within the same system (e.g., meters to kilometers) or between different systems (e.g., inches to centimeters).

How to Use This Calculator

Follow these simple steps:

• Select the category of measurement (e.g., Length, Weight).
• Enter the value you want to convert in the 'From' field.
• Choose the unit you are converting from in the first dropdown list.
• Choose the unit you want to convert to in the second dropdown list. The result will update automatically.

Common Unit Systems

Two primary systems of measurement are widely used:

The Metric System (SI)

The International System of Units (SI), commonly known as the metric system, is the global standard. It's based on powers of ten, making conversions within the system straightforward (e.g., 1 kilometer = 1000 meters).

Imperial and US Customary Units

Used primarily in the United States (US Customary) and to some extent in countries like the UK (Imperial). Units include feet, pounds, gallons, etc. Conversions between these units are often less intuitive.

Common Length Conversions

Common Area Conversions

Common Volume Conversions

Common Weight/Mass Conversions

Common Temperature Reference Points

Temperature conversions are typically formula-based. Here are some key reference points:

Unit Types Overview

This calculator supports several common types of units:

Length

Measures distance (e.g., meter, foot, mile).

Area

Measures surface (e.g., square meter, acre).

Practical Tips

• Double-check your selected units before relying on the conversion, especially for critical applications.
• Be mindful of precision. Some conversions are exact, while others are approximations.
• For temperature, note that conversions are not simple multiplicative factors (except for Kelvin and Celsius relative changes).

Frequently Asked Questions