How many ounces of beef is 60 calores?

It depends whether you mean cooked beef or raw beef. Here are some examples:

In cooked roast beef there are:

• approx 46 calories in each ounce of lean roast beef
• approx 69 calories in a 1½ ounces of lean roast beef.

In raw ground beef there are:

• approx 54 calories in 1 ounce, or 28g, of lean, grass-fed, raw, ground beef.