Don't really like dissing Apps but
I calibrated it and at the end of my day at work it said I had covered .53 miles which I thought wasn't very much as I work in an airport and it takes me 10 minutes to get from one end to the other and I do it many times. I checked what the app said for me walking 50 counted steps and it told me I had walked 33! Tried re-calibrating but it is the same, inaccurate.