How many calories does 50 minutes of power yoga burn?

Yesterday I started practicing yoga - I did a 45 minute vinyasa class. Today, I did 50 minutes of power yoga. Mid-way through the class I really broke a sweat, and It got me wondering just how many calories does a good 50 minutes of power yoga burn???
Anybody have an idea?
I'm 5''4 and 125 pounds If that helps.