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I just bought a fancy Cuisinart 12 cup machine and some fairly pricey freshly ground coffee.

The machine came with a scoop that is equal to 5 g (1 tsp). The machine advises not to use more than 15 scoops. 75 g (2 ⅔ oz) is a dangerous amount for some reason, probably overflowing or clogging the filter basket.

Anyway, how many scoops of coffee would you recommend to make a full 12 pot?

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Your machine's instructions call for 15 TABLESPOONS (see bottom-right corner note at page 3). 15 tbsp = 225 g. –  J.A.I.L. Nov 23 '12 at 10:05
    
Are you sure the scoop measures 5 g? All the coffee scoops I've ever seen (from different makers) are 7~8 g (½ tbsp). –  J.A.I.L. Nov 23 '12 at 10:14
    
The fineness of the grind will affect how the coffee maker deals with the grounds. My experience is that if I use the "normal" full-pot amount of a finer ground, my basket will overflow. –  Kristina Lopez Nov 23 '12 at 16:58
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2 Answers

Normally retailers estimate between 7g and 8g per cup for normal coffee. Try 8g and work your way up. So 12*8=96g for starters.

You might find this article by Harold McGee interesting.

When I dropped the strength close to Mr. Hoffmann’s preferred 1.5 percent by using a third less ground coffee (about 12 grams of coffee to 180 grams, or 6 fluid ounces, of water), the fruity aroma was much more evident, and the flavor generally brighter and more lively. Clarity is a good word for the overall impression.

Edit: Note that I'm talking about espresso cups that are 60ml as opposed to McGee's 180ml cups. Multiply the amount of coffee for the amount of water you are actually using.

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I worked as a coffee roaster for a number of years and met a lot of people. There is a lot of variation to this answer.

What I found works the best is 10-11 g of coffee per 6 oz cup, or 180 mL, so 12 cup maker would be 120 g. Also, the coffee should always be ground to suit the particulars of the brewing method.

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You bring up a very important point -- many coffee & tea devices measure in 'teacups' (6 fl.oz), not the standard american measuring cup (8 fl.oz). So a '12 cup' coffee maker might be 72 oz (~2.1L) or 96 oz (~2.8L) –  Joe Nov 24 '12 at 17:52
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