Fast, exact converters for temperature, length, weight, metric and imperial units, plus handy data and file format tools. Type a number and get the answer instantly.
Temperature
4 toolsConvert between Celsius, Fahrenheit and Kelvin, or open the full temperature set.
Length and Distance
12 toolsMetric and imperial length conversions, from millimetres to miles.
Weight and Mass
3 toolsConvert between grams, kilograms and specialist units, or open the full weight set.
Metric and Imperial Systems
4 toolsSwitch a value between the metric and imperial systems in one step.
Data and File Formats
6 toolsQuick format converters for documents and structured data.
One place for every conversion
A good converter should do one thing perfectly: take your number and return the exact equivalent in another unit, with no clutter and no waiting. This hub collects our most-used converters so you can jump straight to the pair you need, whether that is centimetres to inches for a measurement, Celsius to Fahrenheit for a recipe, or XML to JSON for a bit of data wrangling.
Metric and imperial in one step
If you regularly move between systems, the metric to imperial and imperial to metric tools handle whole categories at once, while the single-unit converters above are quickest when you know exactly which pair you want. For temperature and weight there are dedicated category pages that list every combination we support.
Accurate by design
Each converter uses the internationally defined factor for its units, so the result is exact rather than rounded guesswork. Everything runs in your browser, so your numbers stay on your device and nothing is stored.
Frequently asked questions
Are the conversions exact?
Yes. Each converter uses the standard, internationally defined factor for its units, so the output is mathematically exact. We only round the display for readability, and you can usually see extra decimal places.
Do I need to install anything?
No. Every converter runs in your browser, works on phone and desktop, and needs no download, plugin or sign-up.
Where are the full temperature and weight lists?
Use the All Temperature Converters and All Weight Converters cards above. They open category pages that list every unit pair we support in that group.
Can I convert data formats like XML and JSON here too?
Yes. The Data and File Formats section converts between XML, JSON, CSV, HTML and more, so you can reshape structured data without leaving the site.
Reviewed by Prof. Dr. Khalil Mudassar, PhD
Formulas and conversion factors on this page are checked for accuracy against standard references. View profile
These converters are provided for general use. Results use standard conversion factors and the value you enter. For engineering, legal, medical or trade purposes where precision is critical, confirm the figure against an authoritative reference.
Creator
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
Areas of Expertise: Editorial Leadership, Digital Publishing, Product Strategy, Online Calculators, Web Standards
