Unit Converter
Convert between metric and imperial units for length, weight, temperature, area, and volume.
About This Tool
The Unit Converter handles conversions across length, weight, temperature, volume, area, speed, and more. Simply select the category, choose your source and target units, and get instant results. It is ideal for students, engineers, travelers, and anyone working with different measurement systems.
How to Use
- Select a category (Length, Weight, Temperature, Area, or Volume).
- Choose the unit to convert from and the unit to convert to.
- Enter a value — the result updates instantly.
- Click the swap button to reverse the conversion direction.
Frequently Asked Questions
How many kilometers are in a mile?
1 mile equals approximately 1.60934 kilometers. Conversely, 1 kilometer equals approximately 0.62137 miles. A quick mental estimate: multiply miles by 1.6 to get kilometers, or multiply kilometers by 0.6 to get miles.
How do I convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. Formula: F = C x 1.8 + 32. For example, 25°C = 25 x 1.8 + 32 = 77°F. A quick estimate: double the Celsius value and add 30.
What is the difference between metric and imperial?
The metric system (meters, kilograms, liters) is based on powers of 10 and is used by most countries worldwide. The imperial system (feet, pounds, gallons) is primarily used in the United States. Metric is simpler for calculations due to its decimal-based structure.
How many pounds are in a kilogram?
1 kilogram equals approximately 2.20462 pounds. Conversely, 1 pound equals approximately 0.45359 kilograms. A quick estimate: multiply kilograms by 2.2 to get pounds.
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How It Works
Unit conversion uses mathematical ratios between measurement standards. Linear conversions (length, weight, volume) multiply the input by a conversion factor relative to a base unit. For example, 1 mile = 1.60934 km, 1 pound = 0.453592 kg, and 1 gallon (US) = 3.78541 liters.
Temperature conversions use unique formulas because temperature scales have different zero points: °F = °C × 9/5 + 32, K = °C + 273.15, and °F = (K − 273.15) × 9/5 + 32.
The converter maintains a lookup table of precise conversion factors sourced from NIST (National Institute of Standards and Technology) and the International Bureau of Weights and Measures (BIPM). All calculations use IEEE 754 double-precision floating-point arithmetic, and results are rounded to an appropriate number of significant figures to avoid misleading precision.
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