Different calories burnt on MFP stepper

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Some days I'll walk thousands more steps but would have burned less calories than other days when I don't walk as much but burn more. Why?
The only thing I can think of it walking up and down hills but surely it's not that accurate?

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  • lemonsurprise
    lemonsurprise Posts: 255 Member
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  • Sued0nim
    Sued0nim Posts: 17,456 Member
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    Calories burned is about intensity not just distance ..so speed and gradient and heart rate matter

    That said I don't know what MFP stepper is ...I have a fitbit and get different calories for the same distances regularly