Yup. Everyone will have approximate numbers like that, especially running, which depends on your weight and things like incline, etc. For me, 10 minutes of cardio at the gym (stationary bike) is about 120 calories. That's exactly the calories in one of those new "slim" Coke cans (the larger regular ones are 140). Puts things in perspective. 3500 is a good number to keep in mind. losing 1lb a week, if you're in weight loss mode, is 500 calorie deficit a day. Lots of things fit roughly into 500 calories. I like this YouTube video for a visual of fat: https://www.youtube.com/watch?v=UFjhmddDPRw