Calories burned weight lifting?

From the HELP section:

Doesn't strength training burn calories? Why don't you show any calories burned for strength training?
Estimating the calories burned from strength training is very difficult because it depends on a variety of factors: how much weight you lifted per repetition, how vigorously you performed that exercise, how much rest you took between sets, etc. Because of this, we do not automatically calculate how many calories you burned from strength training exercises.

However, if you'd like, you can add "Strength training" as a cardio exercise to get a rough estimate of how many calories you burned. Please be aware though that this is definitely a rough estimate and can be fairly inaccurate.

Why doesn't MFP post calories burned for strength training? I know I'm burning a lot of calories when I'm lifting. Shouldn't this be considered also instead of just the aerobic portion of your workout?

I was thinking the same thing when I began using MFP, but then I began to understand it.

Strength training using something such as resistance bands could possibly be computed based on for example using HEAVY bands, MEDIUM bands or LIGHT bands, or all bands at once. Obviously that would depend on the exercise(s) conducted and the amount of reps and sets completed.

Using free weights I think is impossible to compute because the calorie burn will be based on exercise conducted, amount of weight used, reps completed, sets completed, and speed of the lift (lifting aerobically or anaerobically). I believe that may be to many variables to compute.

I do wish like you one of their programmers could figure out at least a rudimentary way of computing strength training.

The only way to know how many calories you burn is with a HRM. The settings on MFP are so inaccurate anyway.