It might seem like a cup is a cup but consider the density of your ingredients.
Measuring scale for baking.
Read the markings along the side and or from above by looking straight down into the cup.
Sometimes when i m not sure about a recipe but want to try it anyway i scale down the recipe to 50 of the original.
Pohl schmitt digital food kitchen scale multifunctional weight measuring for cooking and baking in grams ounces auto shut off stainless steel batteries included by pohl schmitt 11 99 11.
A pocket scale like this might also be useful for weighing tiny amounts of ingredients like leavener for baking though in most cases a set of good measuring spoons will do fine although it.
In those circumstances i found it very difficult to calculate 50 of 3 4 cup or to measure 50 of 1 5 tablespoon etc.
A new bag of flour might be more compact than a less full aerated one.
Measuring your baking ingredients using a scale instead of the measuring cups which measure volume is the best way to ensure the perfect amount of each ingredient.