weight traning

To many factors to even make a guess. That is why MFP does not calculate it for you. Under Cardio there is a generic strength training entry but don't expect it to even be close. You can use a HRM but even that doesn't give a very good estimate because HRM's are designed to measure constant cardio activity.

Depends

agreed

Best guess would be using a Heart rate monitor...

How to Calculate Calories Burned Weight Lifting
Comments Dec 19, 2010 | By Stacey Anderson Stacey Anderson began writing in 1989. She published articles in “Teratology,” “Canadian Journal of Public Health” and the "Canadian Medical Association Journal” during her time in medical genetics studying birth defects. She has an interest in psychology, senior health and maternal and child health. Anderson holds a Bachelor of Science in psychology with a minor in biology from the University of Calgary.
Photo Credit Jupiterimages/Goodshoot/Getty Images Weight lifting is a great exercise to not only build strength and tone muscles but to increase your metabolic rate and burn even more calories. For every 3 lbs. of muscle you build, your metabolic rate increases by 7 percent, according to West Valley College. This in turn increases the number of calories you need to maintain your weight by 15 percent. As an added bonus, after a weight training session you continue to burn calories at a higher rate for up to 24 hours. The number of calories you burn during the weight lifting session itself depends on your body weight and the type and intensity of the weight training. Consult your doctor before beginning any new exercise program.

Step 1
Weigh yourself before each weight lifting session. The number of calories you burn partially depends on your weight.

Step 2
Time the number of minutes you lifted weights. This includes the time spent resting between repetitions.

Step 3
Determine the intensity value of your weight training. A bodybuilding level of effort is vigorous and burns 0.055 calories per pound per minute. Circuit training with weights burns 0.042 calories per pound per minute. Strength training with free weights burns 0.039 calories per pound per minute. Lighter weight lifting with moderate effort burns 0.028 calories per pound per minute.

Step 4
Calculate the number of calories burned. First, multiply your weight by the number of minutes you exercised. For example, if you weigh 140 lbs. and lifted weights for 35 minutes, the formula would be 140 x 35 = 4900. Then multiply this number by the intensity value to get the number of calories burned. If you were circuit training, the formula would be 4900 x 0.042 = 206 calories burned.

Read more: http://www.livestrong.com/article/338469-how-to-calculate-calories-burned-weight-lifting/#ixzz1wOwzsG3V

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Formulas available from the Journal of Sports Sciences provide the calorie expenditure calculations for both genders. Men use the equation Calories = [(0.6309 x average heart rate) -- (0.09036 x weight) + (0.2017 x age) -- 55.0969] x time / 4.184.


NOTE: Heart rate monitors are GOOD for counting cardio calories NOT GOOD for counting weight lifting calories.