I recently purchased a 12oz bag from Counter Culture. As I distribute the beans into vacuum seal container, I weight on the total beans and its turn out the weight was short about 18grams.

I'm not sure if that is typical. I also tried to weight in the empty bag and it turns out to be around 22grams. So, I'm not sure if the weight of the 12oz beans including the bag itself or just a fluke that I got a smaller size. Mind you it is not much but just enough for one more shot perhaps.

Since I'm rather new at this, I would like to ask the forums to seek advise on what is the proper etiquette from purchase online roaster?

Thanks.

I buy most of my espresso from Birds and Beans, where a 10 pound bag is usually correct to within a few grams (extra). My greens come from Sweet Maria's, where it's usually to the gram. 5% under in the era of easy electronic gram weighing is a bit much. Are you sure your own scale is accurate? The bag should have been tared before weighing your coffee, but perhaps someone forgot?

I checked my scale with other known weight for test and verified.
I re-scale the beans twice and still register the same number.
Unless I'm off on my calculation ...12oz = 360grams, right?
I got total weight of 342gr on my beans. NOTE: I even went did it again just now with separate contianers. Of course, I tared each container before record the weight.

JUST FOR FUN: Perhaps, I got a little less b/c I used the promotion code to save me a $1 on the purchase. go figure

Actually, 12 oz = 340.2 g, a handy trick is to type in your conversion in a Google search bar and let them do the work, ie. "12 oz in g" or click here (http://www.google.com).

Sounds like you got the right amount of beans after all.

Edit: You may have mixed up volumetric with mass measurements, there's 354 ml (g water) in 12 fluid ounces, but 340.2 g in 12 avoirdupois ounces. There's even other ounces (http://www.wikipedia.org). This is one reason that I've now forced myself to switch over to metric for both roasting and weighing my doses so I'm getting a better feel for grams, and how many shots I have left.

The cup (www.wikipedia.org) is equally messy so I stick to ml now.

Simon? Chris is correct: according to http://www.worldwidemetric.com/Measurements.html, 12 ounces by weight is equivalent to 340.19 grams (rounded to 340.2g, or 340g). By volume, 12 fluid ounces is equivalent to 354.88 ml . . . .

Duh, Thanks for the clarification. I don't know why my iphone mislead me to believe that 1oz=30g
such an embarrassment.
sorry.

SimonSoCal wrote:Duh, Thanks for the clarification. I don't know why my iphone mislead me to believe that 1oz=30g
such an embarrassment.
sorry.

At first thought the confusion/error might have been caused by converting troy oz to grams instead of avoirdupois oz (troy units generally used for precious metals), but the iphone would have still been wrong. 1oz troy = 31.10g. Which leads me to believe it's an error in iphone programming using not nearly enough significant digits resulting in too much rounding, ie. 2.834952300 rounded up to 3 somewhere in its software innards programming calculations. Iphone gets an F on its math test!