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Unit Converter - Online Unit Conversion Tool
Free unit converter for length, weight, temperature, area, volume, speed, and data units. Convert cm to inches, kg to pounds, Celsius to Fahrenheit.
Unit Converter
Convert between all types of measurement units
Result
Enter your values to see results
and click the "Calculate" button
What is a Unit Converter?
A unit converter transforms measurements between different unit systems. Convert between metric (SI) and imperial/US units, temperature scales, data sizes, and more. Essential for travel, shopping, cooking, science, and engineering.
How to Use This Converter
- Select the category (length, weight, etc.)
- Choose the source and target units
- Enter the value to convert
- Click Convert to see the result
Conversion Formulas
Result = Value × Conversion Factor
Temperature uses special formulas: °F = °C × 9/5 + 32. °C = (°F - 32) × 5/9.
Frequently Asked Questions
How many centimeters in an inch?
1 inch = 2.54 centimeters exactly. This is a universal standard conversion. Conversely, 1 cm = 0.3937 inches.
How many kilograms in a pound?
1 pound = 0.4536 kilograms (about 454 grams). Conversely, 1 kg = 2.205 pounds.
How do I convert Celsius to Fahrenheit?
Formula: °F = °C × 9/5 + 32 or °F = °C × 1.8 + 32. Example: 25°C = 25 × 1.8 + 32 = 77°F.
How many kilometers in a mile?
1 mile = 1.609 kilometers. Conversely, 1 km = 0.621 miles. Quick tip: divide km by 1.6 to get miles.
How many centimeters in a foot?
1 foot = 30.48 centimeters. 1 foot = 12 inches. For height: 5'10" = 5 feet 10 inches = 177.8 cm.
What's the difference between US and UK gallons?
US gallon = 3.785 liters, UK gallon = 4.546 liters. UK gallon is about 20% larger. Be careful with recipes and fuel economy figures.
What's the difference between KB and KiB?
KB (decimal) = 1000 bytes, KiB (binary) = 1024 bytes. Computers use binary. A '1 GB' file is actually 0.93 GiB, which is why disk space appears smaller than advertised.
What is absolute zero?
Absolute zero = 0 K = -273.15°C = -459.67°F. It's the theoretical lowest possible temperature where all atomic motion stops. It cannot be reached in practice.
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