It depends on the steak. If its free range it will have less fat and less calories because the cow will have had a better lifestyle. It also depends how it is cooked. For more information about the calories in beef according to weight or portion size, please see the page link, further down this page, listed under Related Questions.
For the calorie content of the different types of steakaccording to weight (including 4 oz steaks) and cooking method, please see the page link, further down this page, listed under Related Questions.
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1 ounce is usually described as a "deck of cards", so I would imagine it would be the size of four decks of cards.