Unit Converter

Quickly convert between various units, supporting length, weight, temperature, area and other common units.

Unit Converter Tool Guide

Unit Converter is a free online tool that can quickly convert between various units, supporting 10 major categories of common units including length, weight, temperature, area, volume, time, speed, pressure, energy, and power. Supports conversion between metric units (meters, kilograms, Celsius, etc.) and imperial units (feet, pounds, Fahrenheit, etc.). Conversion results displayed in real-time, supports one-click copy for easy use. Supports displaying conversion results for all units, can quickly select any unit as target unit. Supports quick selection of common values, supports swapping source and target units. All conversions completed locally in browser, no data uploaded to servers, completely protecting your privacy.

Supports 10 major categories of unit conversions

Real-time conversion, displays results for all units

Local calculation, one-click copy, privacy security

Tool Features

Multiple Unit Categories and Complete Unit Support

Supports 10 major categories of common unit conversions: length units (millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, etc.), weight units (milligrams, grams, kilograms, tons, ounces, pounds, stones, etc.), temperature units (Celsius, Fahrenheit, Kelvin), area units (square millimeters, square centimeters, square meters, square kilometers, square inches, square feet, square yards, acres, etc.), volume units (milliliters, liters, cubic meters, cubic inches, cubic feet, gallons, quarts, pints, etc.), time units (milliseconds, seconds, minutes, hours, days, weeks, months, years, etc.), speed units (meters per second, kilometers per hour, miles per hour, feet per second, knots, etc.), pressure units (pascals, kilopascals, megapascals, bars, standard atmospheres, pounds per square inch, torrs, etc.), energy units (joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours, etc.), power units (watts, kilowatts, megawatts, horsepower, British thermal units, etc.). Each category includes common metric and imperial units, meeting conversion needs for different scenarios.

Real-Time Conversion and Smart Formatting

After entering value, conversion result displayed in real-time, no button click needed. Conversion result automatically formatted based on value magnitude: large values displayed in scientific notation (e.g., 1.234e+6), medium values displayed with appropriate decimal places (2-6 digits), ensuring result accuracy and readability. Supports viewing conversion results for all units, displayed in grid format for easy comparison and selection. Currently selected target unit highlighted (yellow border), clear at a glance. Can click any unit to set as target unit for quick switching. All conversion results can be copied to clipboard with one click for easy use.

Convenient Operation Features and User Experience

Supports quick selection of common values (e.g., 1, 10, 100, 1000, etc.), click button for quick input, improving operation efficiency. Supports swapping source and target units, one-click swap for convenient bidirectional conversion. Supports clear function for quick input reset. Category selection uses button grid layout, currently selected category highlighted, intuitive operation. Unit selection uses dropdown menu, supports search and quick selection. All operations have clear visual feedback, smooth user experience. All conversions completed locally in browser, using precise conversion factors, ensuring conversion result accuracy.

How to Use

1
Select Conversion Category and Units
In the conversion category area, click the unit category to convert (length, weight, temperature, area, volume, time, speed, pressure, energy, power), selected category will be highlighted. After selecting category, select source unit (unit to convert) in "From Unit" dropdown menu, select target unit (converted unit) in "To Unit" dropdown menu. Each category has corresponding unit list including metric and imperial units. After selection, system will automatically set appropriate default values.
2
Enter Value for Conversion
In the input value area, enter the value to convert (supports decimals and negative numbers). Can manually enter or click common value buttons for quick selection (e.g., 1, 10, 100, etc.). After entering value, conversion result will immediately display in "Conversion Result" area, no button click needed. Result will be automatically formatted based on value magnitude, ensuring readability and accuracy. If input is empty or 0, result displays as 0.
3
View All Unit Results and Copy
After conversion completes, can view "All Unit Results" area, which displays conversion results of input value in all available units, displayed in grid format for easy comparison. Currently selected target unit highlighted (yellow border). If need to set a unit as target unit, can click "Set as Target" button on the right of that unit. If need to copy conversion result, can click "Copy Result" button, result will be copied to clipboard. If need to swap source and target units, can click "Swap Units" button. If need to clear, can click "Clear" button to reset. All operations completed locally in browser.

Frequently Asked Questions

What unit categories are supported?

Supports 10 major categories of common units: length (millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, etc.), weight (milligrams, grams, kilograms, tons, ounces, pounds, stones, etc.), temperature (Celsius, Fahrenheit, Kelvin), area (square millimeters, square centimeters, square meters, square kilometers, square inches, square feet, square yards, acres, etc.), volume (milliliters, liters, cubic meters, cubic inches, cubic feet, gallons, quarts, pints, etc.), time (milliseconds, seconds, minutes, hours, days, weeks, months, years, etc.), speed (meters per second, kilometers per hour, miles per hour, feet per second, knots, etc.), pressure (pascals, kilopascals, megapascals, bars, standard atmospheres, pounds per square inch, torrs, etc.), energy (joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours, etc.), power (watts, kilowatts, megawatts, horsepower, British thermal units, etc.). Each category includes common metric and imperial units.

Are conversion results accurate?

Yes, conversion results are very accurate. All conversions use precise conversion factors (based on international standards), ensuring conversion result accuracy. Temperature conversion uses standard conversion formulas (mutual conversion between Celsius, Fahrenheit, Kelvin). Conversion process completed locally in browser, uses JavaScript math calculations, precision is high enough to meet needs of most usage scenarios. For scientific calculations or high precision needs, recommend referring to professional conversion tools or authoritative sources.

Will my data be uploaded?

No, all conversions are completed locally in your browser, not saved to any server, and not uploaded to network. Conversion process completely completed locally, uses JavaScript in browser for calculation, all data only processed in current page memory. Entered values and conversion results only exist in browser, can choose to copy results or clear content, but will not automatically upload. After refreshing page or closing browser, all data automatically cleared, leaving no traces. Completely protecting your privacy and data security.

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