For four standard adult portions of plov, a reliable standard is between 300 and 400 grams (approximately 1.5 to 2 standard measuring cups) of dry rice.
Because authentic plov is quite rich and incorporates substantial amounts of meat, carrots, onions, and rendered fat or oil, 75 to 100 grams of dry rice per person expands into a very satisfying serving. If you are cooking for bigger appetites or want guaranteed leftovers, aiming for the full 400 grams (2 cups) is ideal.
In traditional Central Asian cooking, a common guideline is to balance the main components in roughly equal proportions. For four people, using 400 grams of dry rice alongside roughly 400 grams of meat and 400 grams of carrots will create a balanced and classic proportion for your dish.