60g (2 ounces) of dry pasta per person is a good rule of thumb to follow when cooking pasta.

PASTA TYPE DRY PASTA 60g(2oz) SERVING CUPS COOKED PASTA
Angel Hair 2-1/8 inches (circum) 1 cup
Fettuccine 2-1/8 inches (circum) 1 cup
Linguine 2-1/8 inches (circum) 1 cup
Spaghetti 2-1/8 inches (circum) 1 cup
Thin Spaghetti 2-1/8 inches (circum) 1 cup
Orzo 1/3 cup 4/5 cup
Medium shells 3/4 cup 1-1/8 cups
Large shells 3/4 cup 1-1/4 cups
Campanelle 3/4 cup 1-1/2 cups
Cellentani 2/3 cup 1-1/4 cups
Elbows 1/2 cup 1-1/8 cups
Farfalle 3/4 cup 1-1/4 cups
Gemelli 1/2 cup 1-1/8 cups
Mezzi Rigatoni 3/4 cup 1-1/4 cups
Mini Farfalle 3/4 cup 1 cup
Mini Penne 1/2 cup 3/4 cup
Penne 3/4 cup 1 cup
Mini Wheels> 3/4 cup 1 cup
Mostaccioli 1/2 cup 1-1/4 cups
Penne 2/3 cup 1-1/4 cups
Pipette 2/3 cup 1 cup
Rigatoni 3/4 cup 1-1/4 cups
Rotini 1/2 cup 1 cup
Tri-Color Penne 1/2 cup 1 cup
Tri-Color Rotini 2/3 cup 1 cup
Ziti 2/3 cup 1-1/4 cup