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meat weight how accurate

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i got a nice sirloin tip roast marked 3.70 lbs. several days later i sliced it in 2 for a couple different recipes. one piece was 1 lb 8.8 oz and the other was 1 lb 15.5 oz for a total of 3 lb 8.3 oz, there was also 1 soaker pad and a little loose juice that i didn't weigh because at the time i was not interested. i used a digital kitchen scale that could be off but i never have noticed, when i use it it is for baking.
do you know if that weight discrepancy is typical (3.70 lb or 3 lb 11.2 oz vs my measure of 3 lb 8.3 oz)? only 3 oz difference, when figuring in my head it seemed more.

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  1. ALL the packaging and bloody serum is included in the 3.70#. Not having weighed all of it, you can't be sure there's a discrepancy. Since commercial scales are subject to periodic certification, if there's an inaccurate scale, it's almost certainly yours.

      1. When meats are weighed for sale, they have to deduct what they call a "tare weight" which takes into account the packaging. It is usually a standard amount of ounces (or portions of an ounce), so might not be 100% accurate.

        1. I weigh nearly everything and it's usually accurate to within a few 10s of grams. The biggest difference in weight between product and package label is anything that's been frozen and defrosted loses 30-50ish grams. Otherwise, it's been spot on for me.