Calories - Fitbit vs Garmin 610 vs Garmin FR70 vs MyFitnessPal

Having written about Fitbit vs Garmin in terms of distance and speed, I was interested recently in the calories burnt numbers. First comparison shows up big differences; some research shows there is a fairly wide variation and many calculations and methods in use.  Here are the results from the same walk;

	Garmin 610	Garmin  FR70	Fitbit	MyFitnessPal
Distance	2.87		3.26
Average HR	94	94	N/A
Calories	194	211	385	215

The surpirse result is the Fitbit at 386 calories.   I have posted before about the calibration I have done with the fitbit and distance and all settings are the same across all these option in terms of age/weight/height.

I also used myfitnesspal to calculate a calories burn number, using 18min/mile = 3.3 mph which gives between 200 and 230 to try and understand the big difference on the Fitbit number but the MyFitNessPal number is more like the Garmin.

Garmin 610

Garmin FR70

Fitbit

Heart Rate.  Both Garmins were paired to the same strap;  happily, both show record exactly the same results.

Garmin 610

Garmin FR70

Garmin 610

Garmin FR70