Just tried that site (for S&G's)... Only got Glucose, Sucrose and three DME versions when plugging in parameters...
You can also try the
Bottle Priming Widget site...
The tasteybrew also has far different CO2 volumes for things than I've seen other places. Especially for an Extra Special Bitter... The site lists .75-1.3 CO2 volumes, where I've seen 1.5-2.4 listed in other locations (the site I have linked to above, plus Beer Smith)... Some of the styles are listed with the correct range, but there are others that are off. It might not matter to most people, but it makes me wonder what else is off... Not to mention the shift for the calculation results between that site and two other tools (the other two match)...
I would make sure you know what CO2 volume you want, since the tastey brew site doesn't seem to have the correct ones listed, by default... If you enter in the information manually, then you get a close enough result (within .05oz)...
So, just know what you want, and use whichever tool you like/trust more...