Aqua Zumba

I have been taking an aqua zumba class for the past 8 weeks. It was a new class at my gym and the first session the instructor ever taught (she usually teaches regular zumba). I have really enjoyed it because it takes a lot of pressure off my joints and I love being in the swimming pool. I can feel it in my muscles the next day, but it's not overwhelmingly painful. Any idea of how many calories you burn doing aqua zumba? I have read a few different things on the internet. They all seem to vary greatly.