Exact Units | The free online unit converter

Welcome to the most comprehensive and easy-to-use online unit converter available today. Whether you're a student working on science homework, a professional in engineering, construction, or data science, or simply someone needing quick and accurate unit conversions for daily life, our tool is built to serve you. This all-in-one conversion platform allows you to instantly convert between a wide variety of measurement units across all major categories: length, weight (mass), temperature, volume, area, time, and more. From converting kilometers to miles, kilograms to pounds, liters to gallons, Celsius to Fahrenheit, square meters to square feet, or nanoseconds to minutes — we've got you covered. Our converter supports both metric and imperial systems, along with US customary units and scientific units. You can easily switch between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles — perfect for international travel, technical documents, or schoolwork. Convert weight units like grams, kilograms, ounces, pounds, metric tons, and atomic mass units with precision. Volume conversions include milliliters, liters, cubic meters, and cubic kilometers as well as fluid ounces, pints, quarts, and gallons. Temperature conversions are seamless between Celsius, Fahrenheit, and Kelvin. Our area converter handles everything from square millimeters and hectares to acres and square miles, while the time converter allows conversion between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months (30-day), and years (365-day). Unlike bulky apps or ad-heavy calculators, our tool is clean, fast, mobile-friendly, and completely free. You don't need to download anything, and there’s no account required. Just enter your value, pick your units, and get instant, accurate results. Whether you're on a desktop, laptop, tablet, or smartphone, our responsive design ensures a smooth experience across all devices. This unit conversion site is optimized for performance and accuracy and trusted by users worldwide. It's ideal for scientists, engineers, students, educators, researchers, and anyone who needs reliable, real-time unit conversions. Save time, reduce error, and eliminate guesswork with one of the web’s best online unit converters. Bookmark us for everyday use — the easiest way to convert units anytime, anywhere.