Calorie burn question

deyoun

I recently stared using Fitbit and I started syncing with this App. It says I did 12,379 steps today but when synced , I have only burned 101 burned. I did intense 1 hr Zumba and I was sweating like crazy so I know I definitely burned way more than that. How do you guys count your calories and whats the most accurate way to count them ? Please help. Thanks so much !