Unit Conversion
Tool for Free
Measure and convert units online for free of charge! This simple to use unit converter can handle metric and imperial conversions for length, weight, temperature, volume, shoe size and many more.
Conversion Categories
Choose from our comprehensive collection of conversion tools, organized by category for your convenience.
General Conversions
Essential everyday measurements and units
Convert meters, feet, inches, and more
Convert square meters, acres, hectares, and more
Convert kilograms, pounds, ounces, and more
Convert Celsius, Fahrenheit, Kelvin
Convert liters, gallons, cups, and more
Convert degrees, radians, gradians, and more
Convert seconds, minutes, hours, and more
Convert km/h, mph, m/s, knots, and more
Convert mAh, Ah, Wh, and more
Scientific Conversions
Advanced units for research and engineering
Convert joules, calories, BTU, and more
Convert watts, horsepower, BTU/hour
Convert pascal, bar, PSI, and more
Convert newton-meters, foot-pounds, and more
Convert W/(m⋅K), BTU/(hr⋅ft⋅°F), and more
Convert K/W, °F⋅hr/BTU, and more
Convert cd/m², nit, lambert, and more
Convert bytes, kilobytes, megabytes, and more
Everyday Conversions
Practical conversions for daily life
Convert clothing sizes worldwide
Convert cooking measurements easily
Convert shoe sizes across regions
Convert MPG, L/100km, and more
Convert A4, Letter, Legal, and more
Convert tire dimensions and specifications
Calculate the difference between two dates in days, weeks, months, or years
Understanding Unit Conversion Systems
Unit conversion is a fundamental aspect of measurement systems worldwide. The International System of Units (SI) serves as the modern form of the metric system and is the most widely used system of measurement. Understanding different measurement systems and their conversions is essential for various fields, from science and engineering to everyday life.
Key Measurement Systems
Metric System (SI)
- Base units: meter, kilogram, second, ampere, kelvin, mole, candela
- Decimal-based system
- Used in most countries worldwide
- Standard in scientific and technical fields
Imperial System
- Traditional system used in the US and UK
- Units include: inches, feet, yards, miles
- Pounds and ounces for weight
- Gallons and pints for volume
Common Conversion Categories
| Category | Common Units | Applications |
|---|---|---|
| Length | Meters, feet, inches, yards | Construction, engineering, everyday measurements |
| Weight | Kilograms, pounds, ounces | Cooking, shipping, health monitoring |
| Temperature | Celsius, Fahrenheit, Kelvin | Weather, cooking, scientific research |
Our conversion tools are designed to handle all these categories and more, providing accurate and instant conversions between different units of measurement. Whether you're working on a scientific project, planning a recipe, or simply need to convert measurements for everyday use, our tools make the process simple and reliable.
General Conversion Questions
Everything you need to know about unit conversions and measurement systems
Have more questions? Our conversion tools are designed to be accurate and user-friendly.
Further Reading & Useful Resources
Explore these trusted resources to deepen your understanding of measurement systems and unit conversions.
- NIST - International System of Units (SI)Learn more about the SI system, its base units, and global adoption from the official US National Institute of Standards and Technology.
- UK National Physical Laboratory - Measurement Units ExplainedA comprehensive guide to measurement units, conversions, and their applications in science and industry.
- Wikipedia - Conversion of UnitsGeneral overview and tables for converting between different measurement systems.