How much spaghetti sauce for 15 pounds of spaghetti?

The recommended ratio of spaghetti to sauce is about 1:2, meaning that for every 1 pound of spaghetti, you'll need about 2 cups of sauce. For 15 pounds of spaghetti, you would therefore need about 30 cups of sauce. Since a standard jar of spaghetti sauce holds about 2 cups, you would need approximately 15 jars.