My 1 mile walk most definitely was not a 49 calorie burn. I usually just knock 75-100 calories off whatever the machines say and go with that. Treadmill said closer to 300, MFP said something different. The formula says I burned 49 calories from a 1 mile walk. My Garmin knows my weight, age, estimated VO2max, estimated MaxHR and estimated LTHR. MFP's diary entry knows my age and weight. I don't remember what the treadmill display said, I usually don't pay much attention to it - it was somewhere in the 300s. MFP's exercise entry says it was 363 calories. My Garmin 935 (paired to a Scosche Rhythm+ HRM strap) said it was 360 calories, the formula above says it was 303 calories. I did a 2.4 mile run on the treadmill yesterday. It is 228 reading from the treadmill screen, and 347 by simply entering the minutes in MFP. Now this gives me 84 calories using your formula: 170x0.31x1.593 = 84 calories burnt. Walking: body weight (in pounds) X 0.31 X miles Running: body weight (in pounds) X 0.63 X miles You can use these formulae to sanity check the numbers: Running? Walking? How far did you go in the 30 minutes? In the past I've always changed it to whatever the machine said, but I'm not sure why so big a difference, or which one is actually correct. Typing 30 minutes in the MFP Diary automatically gives me 342 calories.

Today I found that after 30 minutes on the treadmill, the display showed 209.1 calories.

Treadmill calorie calculator