Metric Converter - Free Online Unit Converter

Convert between different units of measurement instantly. Free online converter for temperature, length, area, volume, mass, speed, time, angle, pressure, and energy.

Convert fahrenheit to celsius, feet to meters, miles to km, feet into metric, and more. Free instant unit conversions for temperature, length, area, volume, mass, speed, time, angle, pressure, and energy.

Why Use Our Unit Converter?

Our free online unit converter provides instant, accurate conversions between hundreds of different units across multiple categories. Whether you need to convert fahrenheit to celsius, feet to meters, miles to km, or any other measurement, our tool delivers precise results in seconds.

We understand that unit conversion is essential for students, professionals, travelers, and anyone working with international measurements. Our converter eliminates the need for manual calculations and complex formulas, making conversions simple and error-free. From converting feet into metric to calculating temperature differences, we've got you covered.

With support for multiple languages and a user-friendly interface, our converter works seamlessly on desktop and mobile devices. No registration required, completely free to use, and always available when you need quick, reliable unit conversions.

How Unit Conversion Works

Unit conversion is the process of converting a measurement from one unit to another while maintaining the same quantity. This is accomplished using conversion factors - fixed ratios between units that represent their relationship. For example, converting fahrenheit to celsius uses the formula (F - 32) × 5/9, while converting feet to meters uses the factor 0.3048.

Our converter automatically applies these conversion factors and formulas, ensuring accuracy every time. The system handles complex conversions, including those requiring multiple steps or compound units. Whether you're converting temperature, length, area, volume, mass, speed, time, or other measurements, the underlying principle remains the same: maintaining the quantity while changing the unit of expression.

Example: Converting 100°F to Celsius

To convert 100 fahrenheit to celsius: (100 - 32) × 5/9 = 37.78°C. Our converter performs this calculation instantly, along with showing conversions to all other temperature units simultaneously.

Popular Conversion Reference Table

FromToCommon Use
0°F-17.78°CFreezing point
32°F0°CWater freezes
100°F37.78°CHot summer day
1 mile1.609 kmDistance measurement
1 foot0.3048 metersHeight measurement

Complete Guide to Conversion Categories

Temperature

Convert between Celsius, Fahrenheit, and Kelvin. Essential for weather forecasts, cooking, scientific experiments, and international travel. Popular conversions include fahrenheit to celsius for weather understanding and celsius to fahrenheit for American audiences.

Length

Convert distances and measurements including meters, feet, inches, miles, and kilometers. Crucial for construction, travel, sports, and everyday measurements. Common conversions include feet to meters, miles to km, and converting feet into metric for international projects.

Area

Calculate surface areas in square meters, acres, hectares, and square feet. Important for real estate, land measurement, construction planning, and agricultural applications.

Volume

Convert liquid and dry volumes between liters, gallons, cubic meters, and more. Essential for cooking, fuel consumption, shipping, and container capacity calculations.

Mass

Convert weights between kilograms, pounds, grams, and ounces. Vital for shipping, cooking, fitness, luggage limits, and scientific measurements.

Speed

Convert velocities between km/h, mph, knots, and m/s. Necessary for travel, navigation, vehicle specifications, and athletic performance tracking.