How Many Calories Does a HIIT Class Actually Burn?

Ask ten people what a HIIT class burns and you'll get ten different numbers. Here's what the research — and our members' trackers — actually say.

In a 60-minute PITFIT class, most members land between 500 and 900 calories. The range is wide because the biggest variables are body weight and effort. A 200-lb member sprinting hard will burn meaningfully more than a 130-lb member pacing conservatively — and both are doing it right.

The number your watch shows at the end of class isn't the whole story. High-intensity intervals trigger EPOC — excess post-exercise oxygen consumption, better known as the afterburn effect. Your body keeps working at an elevated rate for hours after class, repairing muscle and restoring oxygen debt. Studies estimate this adds 6–15% on top of the in-class burn.

That's the quiet math behind why HIIT beats steady-state cardio for fat loss per minute: you burn more during the hour, and you keep burning after it.

The practical takeaway: don't chase a calorie number in class. Chase effort. Hit your intervals honestly, scale your speeds up over weeks, and the numbers take care of themselves.