I have found it to be remarkably accurate for me. However, I do NOT add extra activities, like housekeeping, mowing lawn, etc. to my daily activities chart. Unless I do a high intensity workout (which I normally don't do) I leave the numbers as is. I have an excel spreadsheet that I input calories burned vs. eaten and divide the total number by 3500 to see the total pounds I should have lost based on the math. The scales are usually right with this number. It may take a couple of days to catch due to water retention, etc., but every week or so they should be saying the same thing. If they are not, I know that I am either not reporting my food correctly, missing some food that I actually ate, or over reporting "extra" activities. My overall experience though, is it is very accurate.
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