Same exercise, different calorie amounts

ausgirl5

So I've gone for the same walk for the last 3 days. Tuesday it credited 368 cal, yesterday high 200s and today 202 calories. Same walk, same description, same length of time. Linked via my Garmin watch. Amy ideas?

Lietchi

What are the numbers in Garmin? And are you talking about exercise calories for individual exercise sessions or the general calorie adjustment for the day?