I only guesstimated it to be 200. I think that is not accurate, but I feel like the burn varies a lot between days so I think it balances out.

I added CrossFit as a workout and I log 60 minutes / 350 cals no matter what the workout is. I know there are times that I burn more but there are also times that I burn less and I figure it evens out in the end. I have worn a HRM a couple of times and I feel that this is a pretty estimation. I do not want to always wear one though.

Using a Polar HRM too here for the workouts...I find I can burn 650 calories + in a 60 minutes workout when it's really hard (since I'm new to crossfit, everything is kind of pretty hard hehe) but my burn varies between 500 to 600 +...Really interesting to know.

I have a Garmin 310XT and you put in your level of fitness (from 1-10 on with 10 being someone who works out at high intensity 7 days a week). I rank myself as a 7. I average about 200-250 cal a workout with the workouts that involve long runs getting up to a max of 450 (ie 4x 800mrun plus 50 box jumps). A lot of this depends on your weight and level of fitness. I like that my watch accounts for your level of fitness. i just switched from my old garmin 350 and it didn't base its calculations on HR or fitness level and my runs were being calculated at almost 30 calories per mile higher on that watch than my new one. Honestly, the most important thing is that you put a ton of effort into it. You aren't necessarily going to burn a lot of calories in the moment with xfit but the muscles you grow will make you burn more calories in the long term.

I use an HRM every time I crossfit and I range from 600-1000 calories burned. I've been using the same HRM for a year and I think it's as accurate as these devices can be, which is debatable. Take it with a big grain of salt, but I know I'm getting a great workout regardless of what it says on my wrist.

I'm 37 years old and weigh about 205.