Guides
Practical conversion how-tos, no fluff.
Clear, step-by-step guides to the conversions people actually look up: cm to inches, kg to pounds, Celsius to Fahrenheit, MB to GB and more. Each one is backed by a free converter that runs entirely in your browser.
How to Convert Binary to Decimal (and Back)
Convert binary to decimal by hand with place values, plus the quick doubling method and the reverse.
Read guideHow to Convert Celsius to Fahrenheit (and Back)
Convert Celsius to Fahrenheit with the formula and a quick mental shortcut, plus the point where they meet.
Read guideHow to Convert cm to Inches (and Back)
Convert centimetres to inches with the exact 2.54 factor, plus a mental shortcut for quick estimates.
Read guideHow to Convert kg to Pounds (and Back)
Convert kilograms to pounds with the exact factor, plus a quick shortcut and how stone fits in.
Read guideHow to Convert MB to GB (and Why It Is Confusing)
Convert MB to GB, and learn the decimal-versus-binary difference behind 'missing' drive space.
Read guideHow to Convert ml to Cups for Cooking
Convert millilitres to cups for recipes, and learn why a cup is not the same size everywhere.
Read guideHow to Convert MPG to L/100km (and Back)
Convert MPG to L/100km, and understand why it is an inverse conversion rather than a simple multiply.
Read guideHow to Convert mph to km/h (and Back)
Convert mph to km/h with the exact factor and a fast shortcut, plus the common speed-limit equivalents.
Read guideHow to Convert psi to bar for Tyres and More
Convert psi to bar with the exact factor, plus the tyre-pressure equivalents worth knowing.
Read guideHow to Write Roman Numerals (Numbers to Roman)
Learn the seven letters and the subtraction rule, and write any number or year as a Roman numeral.
Read guideSkip the reading — just use the tools
Every guide is backed by a free, in-browser converter. Browse them all.
See all converters