Unit Converter

About This Tool

Unit conversion is a daily necessity for travelers, cooks, students, DIY enthusiasts, programmers, and professionals in virtually every field. This unit converter supports four essential categories: length (inches, feet, yards, miles, millimeters, centimeters, meters, kilometers), weight (ounces, pounds, tons, milligrams, grams, kilograms), temperature (Fahrenheit, Celsius, Kelvin), and data size (bytes, kilobytes, megabytes, gigabytes, terabytes, and more). Each conversion uses precise formulas and updates in real time as you type.

The tool converts in both directions simultaneously — when you type a value in the "From" field, the result appears instantly in the "To" field, and vice versa. The swap button lets you quickly reverse the conversion direction, and switching between categories preserves your current input value so you can compare measurements across different unit systems without re-entering data. The conversion history with pinning support helps you keep track of frequently used conversions.

Common Use Cases

• Converting measurements for recipes and cooking between metric and imperial units
• DIY projects and home improvement calculations for lumber dimensions, hardware sizes, and material amounts
• Travel conversions — miles to kilometers for driving distances, Fahrenheit to Celsius for weather
• Programming data sizes — bytes, kilobytes, megabytes, gigabytes for storage and bandwidth calculations
• Scientific and engineering unit conversions for lab work, manufacturing, and design
• Fitness and health tracking — converting kilograms to pounds for weight, meters to feet for height

Pro Tips

• Use the swap button for quick reverse conversion without re-entering values
• Remember approximate conversions: 1 inch ≈ 2.54 cm, 1 kg ≈ 2.2 lbs, 0°C = 32°F
• Toggle between categories without losing your current value — the tool remembers your input
• Use data size conversions to calculate approximate transfer times based on your internet speed

Frequently Asked Questions

How do I convert between Celsius and Fahrenheit?

To convert Celsius to Fahrenheit: multiply by 9/5 and add 32 (°F = °C × 9/5 + 32). To convert Fahrenheit to Celsius: subtract 32 and multiply by 5/9 (°C = (°F - 32) × 5/9). Use the temperature category for instant results.

What is the difference between MB and MiB?

MB (megabyte) uses the decimal system where 1 MB = 1,000 KB. MiB (mebibyte) uses the binary system where 1 MiB = 1,024 KiB. Hard drive manufacturers use decimal units, while operating systems typically use binary. This tool uses decimal units for simplicity.

How do I convert inches to centimeters?

One inch equals exactly 2.54 centimeters. To convert, multiply the number of inches by 2.54. Use the length category — select inches as the source unit and centimeters as the target unit.

Can I convert between any two units in the same category?

Yes. The tool supports conversion between any two units within the same category. For example, in the length category, you can convert from inches to kilometers, or from meters to feet. Select the source and target units from the dropdown menus.

Part of the FreeQ.One tools suite. Also try our percentage calculator.