- noun a formula or figure used for conversion of units, e.g. of temperatures or distances, from one system to another
- Any factor used to change from one unit of measurement to another. For example, yards are converted to feet by multiplying by three.
- A number that is multiplied by the base currency to find the amount of counter currency that can be procured from a foreign currency exchange. For example if the conversion factor is 1.44 for a euro to dollar conversion, then a block of 10,000 EUR obtains 14,400 USD.