Free Unit Converter
Convert between metric and imperial units instantly. Support for length, weight, volume, area, speed, and time conversions.
All Length Conversions
Quick Reference
How to Use the Unit Converter
Select a Unit Category
Choose the type of unit you want to convert from the category tabs: Length, Weight, Volume, Area, Speed, or Time. Each category contains related measurement units.
Enter Your Value
Type the number you want to convert in the input field. Select the unit you are converting from using the dropdown menu next to the input.
Choose Your Target Unit
Select the unit you want to convert to from the second dropdown. The conversion result is calculated instantly and displayed below.
View All Conversions
Expand the conversion table to see your value converted to all available units in that category at once. Copy any result by clicking the copy button.
Pro tip: Your data is processed entirely in your browser. Nothing is sent to any server, ensuring complete privacy.
About Unit Conversions
Unit conversion is essential in science, engineering, cooking, travel, and everyday life. The world uses two primary measurement systems: the metric system (used by most countries) and the imperial/US customary system (used primarily in the United States). Our converter makes it easy to work with both systems.
Supported Unit Categories
- Length: Kilometers, meters, miles, feet, inches, and more
- Weight: Kilograms, pounds, ounces, stones, and more
- Volume: Liters, gallons, cups, tablespoons, and more
- Area: Square meters, acres, hectares, square feet, and more
- Speed: km/h, mph, m/s, knots, and more
- Time: Years, days, hours, minutes, seconds, and more
Frequently Asked Questions
What types of units can I convert?
Our unit converter supports six categories: Length (meters, feet, miles, etc.), Weight (kilograms, pounds, ounces, etc.), Volume (liters, gallons, cups, etc.), Area (square meters, acres, hectares, etc.), Speed (km/h, mph, knots, etc.), and Time (seconds, minutes, hours, days, etc.).
How accurate are the conversions?
Our converter uses precise conversion factors to ensure accuracy up to 6 decimal places. For scientific or engineering applications requiring higher precision, we recommend verifying critical calculations with specialized tools.
What is the difference between US and UK gallons?
A US gallon equals approximately 3.785 liters, while a UK (Imperial) gallon equals approximately 4.546 liters. The UK gallon is about 20% larger than the US gallon. Our converter supports both measurements.
How do I convert between metric and imperial units?
Simply select your starting unit (e.g., meters) and your target unit (e.g., feet). Enter the value you want to convert, and the result will be calculated automatically. You can also see all possible conversions at once in the expanded table.
Why are there different measurement systems?
The metric system was developed in France during the 1790s and is based on powers of 10. The imperial system evolved from English units. Most countries use metric, while the US primarily uses imperial/US customary units. Our converter makes it easy to work with both systems.
Can I convert compound units?
This converter handles single-dimension units. For compound conversions (like converting area or volume between different length-based units), use the appropriate category. For example, use the Area category to convert square feet to square meters.