How many calories does weight lifting burn?

Add "Strength training (weight lifting, weight training)" to Cardiovascular to get estimated Calories burned added to your Diary. Please note that the Calories burned for Cardiovascular exercises provided by MFP are based on published metabolic equivalent of tasks (METs), which are estimates for a general population and may differ for you as an individual. If desired, add individual strength training exercises, such as "Biceps Curl," to Strength Training to have a log of sets, reps, and weights as individual exercises.

Please see these articles, and search for other helpful articles on the MFP Help pages...

myfitnesspal.desk.com/customer/portal/articles/11170-why-don-t-you-calculate-calories-burned-for-strength-training-

myfitnesspal.desk.com/customer/portal/topics/455842-exercise-diary-and-exercise-database/articles

Calories burned for weight lifting are pretty nominal and really aren't worth counting unless you're in competition mode and you're really trying to keep an absolutely strict count on your macro counts to really dial everything in. Guaranteed, you're not going to burn more than 100 calories within an hour doing weights. That is unless you're doing a HIIT program, but that's different.