A very rough rule of thumb is that you burn about 100 calories per mile walked (slightly more for heavier people, slightly less for lighter people). If you walked 1 mile or so, then the 140 is more likely to be right. If it was 2 miles, 240 is more likely to be right.
Spark doesn't take vertical gain into account, but it would take a gain of several hundred vertical feet to burn 240 calories in 1 mile plus.
I'm using an app that tracks my distance, elevation and weight during a walk and that showed as an example that I burned 240 calories for my walk this morning. I put the same information on SparkPeople (no elevation) and it said 140 calories burned instead. How do I know what is accurate?
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