You can use the calculators for cloud mining, it just requires a little math.
To figure out cloud hashing for CEX.IO on CoinWarz you look up CEX.IO's numbers which are 1.5 watts per GHz and $0.30 per KW. So if you buy 100 GHz, that's 150 watts and 30 cents per KW. Plug those numbers into CoinWars and you get your profit.
I personally like PBMining (see my link in sig). Where I just buy a 5 year GHz contract and don't have to worry about electricity and such. Then I can see my profit on
https://bitcoinwisdom.com/bitcoin/difficulty by just typing in my number of GHz.