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Free Online Unit Converter
Convert between units of length, weight, temperature, volume, speed, area, data storage, and time instantly. Our free online unit converter provides accurate conversions for all your measurement needs. Perfect for students, professionals, and anyone who needs quick unit conversions.
How to Use Our Unit Converter in 3 Easy Steps
Select Category
Choose the type of conversion you need: length, weight, temperature, volume, speed, area, data storage, or time.
Enter Value
Select your "from" unit, enter the value, and choose your "to" unit. The conversion happens instantly.
Get Result
The converted value appears instantly. Use the copy button to copy the result to your clipboard.
Supported Unit Conversions
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight & Mass Converter
Convert between milligrams, grams, kilograms, ounces, pounds, and tons.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales.
Volume Converter
Convert between milliliters, liters, fluid ounces, cups, pints, quarts, and gallons.
Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, and knots.
Area Converter
Convert between square meters, square kilometers, square feet, acres, and hectares.
Data Storage Converter
Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes.
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, and years.
Cooking Converter
Convert between teaspoons, tablespoons, cups, fluid ounces, and milliliters for cooking.
Key Features of Our Unit Converter
Instant Conversion
Results appear immediately as you type. No need to click a convert button.
Swap Units
Quickly swap between "from" and "to" units with one click.
Copy Results
Copy converted values to clipboard with a single click.
Precision Control
Choose how many decimal places to display in your results.
Multiple Categories
Convert between 9 different categories of units and measurements.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, and mobile.
Common Conversion Reference
Temperature Quick Reference
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -18°C | 0°F | Very Cold Day |
| 0°C | 32°F | Water Freezing |
| 21°C | 70°F | Room Temperature |
| 37°C | 98.6°F | Body Temperature |
| 100°C | 212°F | Water Boiling |
Length Quick Reference
| Metric | Imperial | Common Use |
|---|---|---|
| 1 km | 0.62 miles | Running distance |
| 1 m | 3.28 feet | Room height |
| 1 cm | 0.39 inches | Small objects |
| 1 mm | 0.04 inches | Precise measurements |
| 1 inch | 2.54 cm | Screen sizes |
Frequently Asked Questions
How accurate are the conversions?
Our unit converter uses precise conversion factors and formulas to ensure accurate results. All conversions are based on internationally recognized standards and definitions.
Can I convert between different categories?
No, conversions are limited to units within the same category. For example, you can convert between different length units (meters to feet) but not between length and weight units.
Why does the US use different units?
The United States primarily uses the Imperial system (feet, pounds, Fahrenheit) while most other countries use the Metric system. This historical difference dates back to the 18th century.
How do I convert Celsius to Fahrenheit in my head?
For a quick approximation: double the Celsius temperature and add 30. For example, 20°C × 2 + 30 = 70°F (actual conversion is 68°F). For more accuracy, use our converter tool.
What's the difference between weight and mass?
Mass is a measure of the amount of matter in an object (measured in kg), while weight is the force of gravity acting on that mass (measured in pounds or newtons). On Earth, they're often used interchangeably.
How many teaspoons are in a tablespoon?
There are 3 teaspoons in 1 tablespoon. This is a common cooking conversion that's useful for scaling recipes up or down.
Common Conversion Formulas
Temperature Conversions
Celsius to Fahrenheit: (°C × 9/5) + 32 = °F
Fahrenheit to Celsius: (°F − 32) × 5/9 = °C
Celsius to Kelvin: °C + 273.15 = K
Kelvin to Celsius: K − 273.15 = °C
Length Conversions
Meters to Feet: m × 3.28084 = ft
Feet to Meters: ft × 0.3048 = m
Kilometers to Miles: km × 0.621371 = mi
Miles to Kilometers: mi × 1.60934 = km
Technical Information
Processing
- • All unit conversion happens in your browser
- • No data is sent to external servers
- • Real-time conversion with precise formulas
- • Supports 9 different unit categories
- • High precision calculations
Browser Compatibility
- • Works on all modern browsers
- • Chrome, Firefox, Safari, Edge
- • Mobile-friendly responsive design
- • Dark mode support
- • Offline unit conversion
Privacy & Security
Your privacy is our top priority. Our unit converter tool processes all conversion data locally in your browser, ensuring that your measurements never leave your device. We don't collect, store, or transmit any of your conversion data.