Main journals = 2.4996 to 2.5001 in.
Rod journals = 2.0934 to 2.0955 in.
If your rod journals have worn to below 2 inches you don't need to worry about measuring it. The journal will have lost over 3/32" and the crankshaft will have destroyed itself and taken the block along with it.
Keep in mind that free advice can frequently be worth less than you pay for it.