reckon

"Reckon" is a very common word in Australian English.

Yes, it's definitely widely used in the UK. I'm not sure if it is seen as somewhat common though, I'm trying to imagine an upper class person speaking the Queen's English using it and can't quite do so.

Its a Yorkshire word,


reckon
“to consider’ to pretend; to think”
OE recenian ‘to reckon’, ON reikana ‘to reckon, to calculate;
OE- Old English, ON - Old Norse

Check out, http://www.yorksj.ac.uk/dialect/