No. An average cup of coffee holds 8 ounces and a tea cup holds 6. For you Canadians out there a large double double holds 12 ounces Imperial An extra large take out cup holds 16 ounces.
Let's see......18 cup with a cup being 8 ounces. 18 x 8=154. So you are starting with 154 ounces of water. Divide that by 6. 154/6=25.6 rounded up to 26.If your brand of coffee calls for one...