CALORIES BURNED?

I wanted to see if any of the Workout Gurus here could give me a good estimate of Calories burned on the following 3 workouts:


50 x 5 Workout

50 Burpees
50 Push-Ups
50 Sit-ups
50 Squats
50 Jumping Jacks



50/25 x 5 Workout

RD1

50 Burpees
50 Push-Ups
50 Sit-ups
50 Squats
50 Jumping Jacks

RD2

25 Burpees
25 Push-Ups
25 Sit-ups
25 Squats
25 Jumping Jacks



300 Workout

25 Burpees
25 Mountain Climbers
25 Push-Ups
25 Jump Squats

x 3 Rounds



I don't own a HRM, so I'm am seeking opinions here.

Im 29 Yrs Old, 5-8, 236, Male.


Another question:

Do you think starting the workout with the most difficult exercise (tiring your self out) increases the Calorie burn for the rest of the workout?

Thanks.