If it were water, 2 teaspoons would be close to 10 g. However, coffee grinds have a much lower bulk density than water. Peet's is likely close on 2 T = 10 g. However, the ratio also depends on how you brew the coffee (and personal preference). Most people use drip machines, and that is way too much unless you like coffee so strong that you can stand the spoon up in it. In a drip machine, as little as half that may suffice. For other ways of brewing coffee, 10 g/150 mL may be appropriate.
From: Edward Schlesinger <edws...@gmail.com> To: U.S. Metric Association <usma@colostate.edu> Sent: Monday, August 31, 2015 11:10 PM Subject: [USMA:54846] Feedback Concern: Coffee and Tea questions Hi All,I wanted to share a response my spouse and I received from Peet's Coffee and Tea.We brought a bag of ground coffee. When we were going to perculate some, we read the directions and I thought it was asking for to much ground coffee since I know 2 teaspoons are 10g. So I wrote to customer service and got this reply: Feedback Concern: Coffee and Tea questions. Feedback or question: The instructions on the label of Espresso Forte read that we should measure 2 TBSP (10 g) per 6 oz of water. However, 10 g equals 2 tsp. So, it seems to us that you're labeling instructions are incorrect. So, we measured 12 tsp for our percolator which holds 4 1/2 8 oz cups.-- Sincerely, Edward B. Stephany (Peet's Coffee and Tea)Aug 27, 8:53 AM Hi Sarah and Edward, Thanks for your email. In checking the website for "The Basics-Coffee FAQ", here is what they say about measuring coffee: A standard "cup" of coffee uses six ounces (177 ml) of water. The SCAA's standard measure of ground coffee for this quantity of wateer is 10 grams (+/- 1 gram) or slightly over a third of an ounce (or, simply, two tablespoons). I believe measurement depends on the items being weighed. We appreciate your business and your time in contacting us, and let me know what additional comments you have. Warmest regards, Stephany | Customer Service Specialist | Peet's Coffee & Tea