Free Unit Converter Online
Convert between different units of measurement quickly and accurately. Whether you need to convert meters to feet, kilograms to pounds, or Celsius to Fahrenheit, this free tool makes it simple.
✅ 7 Conversion Types
⚡ Instant Results
🔄 Bidirectional
📱 Mobile Friendly
How to use: Select the type of conversion you need, enter a value, choose your units, and see the result instantly. Click the swap button to reverse the conversion.
Unit Converter
🔥 Common Conversions
📊 Quick Reference Guide
Length Conversions:
- 1 meter = 3.28084 feet = 39.3701 inches
- 1 kilometer = 0.621371 miles = 1,000 meters
- 1 mile = 1.60934 kilometers = 5,280 feet
- 1 foot = 0.3048 meters = 12 inches
- 1 inch = 2.54 centimeters
Weight/Mass Conversions:
- 1 kilogram = 2.20462 pounds = 1,000 grams
- 1 pound = 0.453592 kilograms = 16 ounces
- 1 ounce = 28.3495 grams
- 1 ton (metric) = 1,000 kilograms = 2,204.62 pounds
Temperature Conversions:
- Celsius to Fahrenheit: (°C × 9/5) + 32
- Fahrenheit to Celsius: (°F - 32) × 5/9
- Celsius to Kelvin: °C + 273.15
- Water freezes at 0°C = 32°F = 273.15K
- Water boils at 100°C = 212°F = 373.15K
Volume Conversions:
- 1 liter = 0.264172 gallons (US) = 1,000 milliliters
- 1 gallon (US) = 3.78541 liters = 4 quarts
- 1 cup = 236.588 milliliters = 8 fluid ounces
Note: These are approximate conversions. The calculator provides more precise results.
📚 Understanding Unit Conversions
Why Do We Need Unit Converters?
Different countries and industries use different measurement systems. The United States primarily uses the Imperial system (feet, pounds, Fahrenheit), while most of the world uses the Metric system (meters, kilograms, Celsius). A unit converter helps bridge this gap.
Metric vs Imperial System:
- Metric System: Based on powers of 10, making it easier to convert (e.g., 1 km = 1,000 m). Used by most countries worldwide.
- Imperial System: Based on historical measurements (feet, inches, pounds). Primarily used in the United States.
Common Use Cases:
- Travel: Converting miles to kilometers for road trips abroad
- Cooking: Converting cups to milliliters for international recipes
- Science: Converting between Celsius and Fahrenheit for experiments
- Construction: Converting feet to meters for building plans
- Fitness: Converting pounds to kilograms for weight tracking
Tips for Accurate Conversions:
- Always double-check which unit system you're starting with
- Be aware of rounding - more decimal places = more precision
- For cooking, slight variations usually don't matter much
- For science or engineering, use precise conversions
❓ Frequently Asked Questions
Yes, completely free. No registration required, no hidden fees, no limits on how many conversions you can do. We built this tool to help people convert units quickly without any barriers.
The converter uses standard conversion factors and formulas. Results are accurate to several decimal places. For most everyday purposes (cooking, travel, general use), the accuracy is more than sufficient. For scientific or engineering work requiring extreme precision, always verify with your specific requirements.
The metric system (meters, kilograms, liters) is based on powers of 10 and used by most countries worldwide. The imperial system (feet, pounds, gallons) is primarily used in the United States and is based on historical measurements. The metric system is generally easier to work with because of its decimal-based structure.
You can convert between any units within the same category (e.g., all length units, all weight units). You cannot convert between different categories (e.g., you can't convert meters to kilograms) because they measure different things.
Yes! The unit converter is fully responsive and works on smartphones, tablets, and desktop computers. All conversions happen in your browser, so it works even with a slow internet connection once the page loads.