📐Unit Converter

This converter handles the three measurements people deal with most: length, weight/mass, and volume. It moves values between the metric system (centimetres, metres, kilometres, kilograms, litres) and the imperial and US customary units (inches, feet, miles, pounds, gallons).

Whether you need centimetres from inches, kilometres from miles, kilograms from pounds, or litres from gallons, you enter one number, pick your units, and read the answer. There is nothing to install and no sign-up required.

The metric system is built on units of ten, which makes scaling simple: 100 centimetres make a metre, 1,000 metres make a kilometre, and 1,000 grams make a kilogram. Most of the world uses it for everyday measurement, science, and trade.

Imperial and US customary units, common in the United States and still seen in the UK, use historical steps like 12 inches to a foot and 16 ounces to a pound. Because the two systems do not line up neatly, a converter saves you from awkward mental arithmetic.

A conversion factor is a fixed multiplier that links one unit to another. Since 1 mile is exactly 1.60934 kilometres, you turn any distance in miles into kilometres by multiplying by 1.60934, and you go back with 0.621371.

Each pairing has its own factor: 0.3048 for feet to metres, 2.20462 for kilograms to pounds, 0.453592 for pounds to kilograms, 3.78541 for US gallons to litres, and 0.264172 for litres to US gallons. The converter stores these so you do not have to remember them.

Cooking from an international recipe often means switching between litres and US gallons, or scaling ingredients listed in unfamiliar units. Travellers use it to read road signs in kilometres, estimate distances, and pack within weight limits given in kilograms or pounds.

Shipping and online shopping frequently quote sizes and weights in mixed units, so converting feet to metres or pounds to kilograms helps you compare quotes and avoid surprises. In fitness, it makes sense of body weight in kilograms versus pounds and running distances in miles versus kilometres.

Every unit conversion is just multiplication by a single fixed number called the conversion factor. For example, because 1 inch equals 2.54 centimetres, you multiply any number of inches by 2.54 to get centimetres.

To convert in the opposite direction you use the reciprocal factor. Centimetres back to inches, or kilometres back to miles (0.621371), simply uses the matching factor in the other column. The math never changes, only the factor does.