Habdlebar advice

Currently I have the Boardman Pro 29er 2016 and I want to change the bars for a higher rise as I feel it would be more comfortable for my style of riding. I can't find the size of the bar without visiting the shop to ask, I was wondering if anybody could help me with this?
Also I'm thinking of buying renthal bars but I'm looking to keep the weight kind of similar.
Also I'm thinking of buying renthal bars but I'm looking to keep the weight kind of similar.
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http://www.boardmanbikes.com/products/913-mtb-pro-29er.html
I have had many BMX's in the past and the bar size is usually measured in fractions.