How many grams of pumpkin seed kernels are in 1 tablespoon? 7.48 grams of pumpkin seed kernels fit into one tablespoon. 2 tablespoons of pumpkin seed kernels = 14.96 grams of pumpkin seed kernels. 3 tablespoons of pumpkin seed kernels = 22.44 grams of pumpkin seed kernels.