If recipe calls for 450 gms how many cups is this?

To convert grams to cups, you need to know the density of the ingredient you are measuring. Different ingredients have different densities, so the number of cups will vary depending on the ingredient. For example, 1 cup of all-purpose flour weighs 120 grams, while 1 cup of granulated sugar weighs 200 grams.

Without knowing the specific density of the ingredient, it's not possible to accurately determine the number of cups in 450 grams.