Hundredweights (UK) to tonnes conversion calculator above calculates how many tonnes are in 'X' hundredweights (UK) (where 'X' is the number of hundredweights (UK) to convert to tonnes). In order to convert a value from hundredweights (UK) to tonnes (from cwt to t) just type the number of cwt to be converted to t and then click on the 'convert' button.