Unit Converter
Convert units easily with our free online unit converter. Perfect for unit converter, online unit converter, and measurement converter needs.
Length Converter | Weight Converter | Volume Converter | Temperature Converter
Our unit converter supports multiple measurement types including length, weight, volume, and temperature conversions.
How to Use the Unit Converter
- Select the conversion category — length, weight, volume, or temperature.
- Choose the units to convert from and to (e.g., kilometers to miles).
- Enter your value and the conversion happens instantly.
Understanding Unit Conversions
The world uses two primary measurement systems: the metric system (used by most countries) and the imperial system (used primarily in the United States). Converting between these systems is a daily need for international trade, travel, cooking, and science.
Common Length Conversions
1 mile = 1.609 kilometers. 1 foot = 30.48 centimeters. 1 inch = 2.54 centimeters. 1 meter = 3.281 feet. These conversions are essential for understanding distances, heights, and dimensions across measurement systems.
Common Weight Conversions
1 pound = 0.4536 kilograms. 1 kilogram = 2.205 pounds. 1 ounce = 28.35 grams. These are frequently needed for cooking recipes, shipping packages, and understanding body weight across countries that use different systems.
Temperature Conversions
Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Key reference points: water freezes at 0°C (32°F) and boils at 100°C (212°F). Normal body temperature is 37°C (98.6°F).
Volume Conversions
1 gallon = 3.785 liters. 1 liter = 0.264 gallons. 1 cup = 236.6 milliliters. Volume conversions are especially important in cooking, where recipes from different countries use different measurement systems.
Frequently Asked Questions
How do I convert kilometers to miles?
Multiply kilometers by 0.6214 to get miles, or divide by 1.609. For a quick estimate, multiply by 0.6. For example, 100 km ≈ 62 miles. Our converter handles this and many other conversions instantly.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 72°F: (72 − 32) × 5/9 = 22.2°C. For a rough estimate, subtract 30 and divide by 2.
Why does the US use a different measurement system?
The US inherited the imperial system from Britain and never fully adopted the metric system, despite Congress authorizing its use in 1866. While science and military use metric, everyday American life uses imperial units for temperature (°F), distance (miles), and weight (pounds).