Unit Converter

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Unit Converter

Convert length, weight, temperature, area, volume, speed and time units quickly and accurately with this free online Unit Converter.

Conversion Result
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Enter a value and select your units.

Unit Converter – Free Online Conversion Tool

The Unit Converter is a free online tool for converting values between commonly used measurement units. It supports length, weight, temperature, area, volume, speed and time conversions.

What Is a Unit Converter?

A unit converter changes a measurement from one unit into another equivalent unit. For example, you can convert kilometers to miles, kilograms to pounds, liters to gallons or Celsius to Fahrenheit.

Supported Unit Categories

  • Length: millimeters, centimeters, meters, kilometers, inches, feet, yards and miles
  • Weight / Mass: milligrams, grams, kilograms, ounces, pounds and tons
  • Temperature: Celsius, Fahrenheit and Kelvin
  • Area: square meters, square kilometers, square feet, square yards, acres and hectares
  • Volume: milliliters, liters, cubic meters, gallons, quarts, pints and cups
  • Speed: meters per second, kilometers per hour, miles per hour, knots and feet per second
  • Time: milliseconds, seconds, minutes, hours, days and weeks

How to Use the Unit Converter

  1. Select a conversion category.
  2. Enter the value you want to convert.
  3. Select the original unit.
  4. Select the target unit.
  5. Click Convert.
  6. The converted result will appear immediately.

Length Conversion

Length conversions are useful for measurements such as distance, height, construction dimensions and travel distances.

1 kilometer = 1,000 meters

Weight Conversion

Weight or mass conversion can be useful when working with kilograms, grams, pounds and ounces.

1 kilogram ≈ 2.20462 pounds

Temperature Conversion

Temperature can be expressed using Celsius, Fahrenheit or Kelvin. The formulas are different from ordinary unit conversions.

Fahrenheit = (Celsius × 9/5) + 32
Celsius = (Fahrenheit − 32) × 5/9

Volume Conversion

Volume conversion is commonly used for liquids, containers, cooking measurements and scientific calculations.

Speed Conversion

Speed can be converted between kilometers per hour, miles per hour, meters per second, knots and other commonly used units.

Where Can a Unit Converter Be Used?

  • School and educational calculations
  • Engineering and technical work
  • Construction measurements
  • Cooking and recipe measurements
  • Travel planning
  • Fitness and sports calculations
  • Science and mathematics
  • Everyday measurement conversions
Note: Conversion results are mathematical conversions between units. They should not be treated as professional advice where precise regulatory, engineering or scientific measurements are required.

Is This Unit Converter Free?

Yes. ToolMetaWeb's Unit Converter is free to use and works directly in your web browser. No registration is required.

Frequently Asked Questions

A unit converter is an online tool that converts a measurement from one unit into another equivalent unit.
This tool supports length, weight or mass, temperature, area, volume, speed and time conversions.
Yes. Select Length, choose kilometers as the original unit and miles as the target unit.
Yes. Select Weight / Mass, choose kilograms as the original unit and pounds as the target unit.
Yes. Select Temperature, choose Celsius and Fahrenheit, enter the temperature and click Convert.
Yes. The calculator is designed to work on mobile phones, tablets and desktop browsers.
Yes. The Unit Converter is free to use and does not require an account.

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