Popular Conversions
The most-searched single conversions — cm to inches, kg to pounds and more — each with its full table.
About these popular conversions
The conversions in this category are the single pairs people search for most: centimetres to inches, metres to feet, kilometres to miles, kilograms to pounds, and their reverses. Each one gets a full page rather than a single-answer box, for a practical reason. A search widget returns one number for one value and stops; real work arrives as a height that must be split into feet and inches, a cut list of twenty lengths, a training log in kilometres that a plan expects in miles, or a fraction of an inch that a workshop chart expresses in sixteenths. A full page can carry all of that, and these do.
Every page is built to the same standard. The exact factor comes first, stated as a definition: 1 inch equals 2.54 centimetres exactly, 1 foot equals 0.3048 metres exactly, 1 mile equals 1,609.344 metres exactly, and 1 pound equals 0.45359237 kilograms exactly. Then comes the formula, a full conversion table generated from that factor, a batch mode that converts a pasted list in one pass, worked examples with the substitution shown, and answers to the questions that pair actually raises, from why a marathon is not exactly 26.2 miles in kilometres to why 25 millimetres is only approximately one inch.
Use these pages when you know the exact pair you need, and the broader category converters when you do not, or when the quantity has more than two units in play. Heights have their own page, Centimeters to Feet and Inches, because the answer there is two units spoken together and a decimal-feet result misleads anyone who reads its digits as inches. Weight pages show the stone-and-pounds split alongside plain pounds, because that is how the figure is spoken in the countries that use it. Whichever page you land on, the rule is the same: convert at full precision, and round only the final figure you display.
Frequently asked questions
Why does a single conversion need a whole page?
Because the single number is usually the start of the task, not the end of it. A full page adds the exact factor and formula, a conversion table covering the range people actually use, a batch mode for lists, worked examples and the pair-specific pitfalls — such as reading decimal feet as feet and inches. If you only need one number, it is here; if you need twenty, they are here too.
Are the tables on these pages exact?
The tables are generated from the same exact defined factors as the converters themselves — 2.54 cm per inch, 0.3048 m per foot, 1,609.344 m per mile, 0.45359237 kg per pound — and rounded only for display. Where a value is an approximation, such as a millimetre size matched to its nearest sixteenth of an inch, the page labels it as nearest rather than exact.
Can I convert a list of values instead of one at a time?
Yes. Every pair page includes batch mode: paste one value per line and each line is converted with the page's exact factor. That covers the common real-world cases — a column of heights, a set of parcel weights, a list of race distances — that a one-answer search widget handles one slow query at a time.