Unit Conversion
Tool for Free
Measure and convert units online! 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
Popular Conversions
Quickly jump to the most frequently used unit conversions.
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.