16 tablespoons (in US currency)
1 cups (US) = 15.9999 tbl.sp. (US) Source: metric conversions.org
One tablespoon (tbsp.) equals three teaspoons (tsp.)
1 oz equals 2 tablespoons.
The answer here is valid for the USA / USA measurements. Two tablespoons = 1/8 cup = traditional "scoop of coffee" for brewing one cup. Therefore, 16 US tablespoons = 1 US cup.