I would also caution about believing calorie burn calculators. Without measuring heart rate at least, or power output at best, calorie counters give very high estimates. If I run my Garmin without the heart rate strap, it estimates double the calories compared to with the strap. Programs like Map My Fitness also seem to be about double. This can lead to the trap of believing you burned 1000 calories so can splurge, when you really only burned 500.