The multiplier may be different, and most likely those sites count your regular exercise as part of your activity. Really, what you need to do, what we all need to do, is go with one of those reasonable numbers (sometimes just pick), find out if that's maintenance for us, and then tweak when it isn't till we find our maintenance at a given weight and activity level, and then move on from there. My real number is waaaay lower than any formula gives me.
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