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Convert between any units with our free online calculator. Supports length, weight, temperature, volume, area, speed, pressure, energy and 15+ measurement categories. Get instant accurate conversions between metric and imperial systems with real-time results as you type.
Convert between 500+ different units with scientific precision. Supports length, weight, temperature, volume, area, speed, energy, and 15+ specialized measurement categories.
International conversion factors with precision up to 15 decimal places. Trusted by engineers, scientists, and professionals worldwide.
Works seamlessly on desktop, mobile, and tablet. Supports metric, imperial, and international scientific unit systems.
No registration, advertisements, or usage limits. Professional-grade conversions available to everyone, forever.
Simple 4-step process for accurate unit conversions between any measurement systems
Choose from 15+ categories including length, weight, temperature, volume, area, speed, energy, pressure, and specialized scientific units.
Select source and target units from our comprehensive database. Supports metric, imperial, and international scientific unit systems.
Type any number including decimals, fractions, or scientific notation. Supports unlimited precision for professional calculations.
View precise converted values instantly with real-time updates as you type. No delays, loading times, or refresh needed.
Expert recommendations for maximum accuracy and efficiency
Use decimal notation (5.5) instead of fractions (5½) for maximum accuracy in scientific and engineering calculations.
Use the swap button to instantly reverse conversion direction without re-entering values or changing selections.
Results update automatically as you type, perfect for comparing multiple values and exploring different scenarios.
Fully responsive design works flawlessly on smartphones and tablets with touch-friendly interface and gestures.
Professional-grade converters for every measurement used in science, engineering, and daily life
Convert between all length units including meters, feet, inches, kilometers, miles, and specialized measurements like nautical miles and light-years.
Accurate weight conversions between metric (kilograms, grams), imperial (pounds, ounces, stones), and scientific units including atomic mass.
Convert between Celsius, Fahrenheit, Kelvin, and Rankine scales for weather, cooking, and scientific applications with precise formulas.
Calculate area conversions for construction, real estate, and land measurement between square meters, acres, hectares, and square feet.
Convert energy units for physics, engineering, and everyday applications including joules, calories, kilowatt-hours, and BTU.
Convert power units for electrical, mechanical, and automotive applications including watts, horsepower, BTU/hour, and kilowatts.
