I don't think the pedometer measurement of calories is very accurate.
The most reliable, readily available measurement is with a heart rate monitor.
I think that's debatable also.....
"They" say that the average 150 lb woman burns about 100 calories per 15 minutes of aerobic activity. Interpret as you wish
A more recent goal that I have read is to try to get in 3000 steps in 30 minutes.