I wore a heart rate monitor for a 90 minute hitting practice and burned over 1500 calories. Very few breaks and constant rallying.
Same monitor in the gym for a 60 min weight workout and 20 mins of intervals burned 1200.
Tough for a chart to predict the effort that goes into someone's workout. I'd say get a monitor if you really want to know. Polaris makes good ones that sync up with treadmills.