Doing yard work this morning

Doing yard work is most certainly a workout.  However I take quick breaks during all of the yard work.  I wish I had taken a pedometer which would give me an idea of the number of calories that I have burned.  I weight nearly 300 pounds, which more than likely I burned more calories than a person who weighs 150-200 pounds.  I would have lost an average of 250 calories per hour, which would be the fact that I burned nearly 500 calories doing the work that I did on my own this morning.