There are calories in 1 slice of Cheddar Cheese. Get full nutrition facts and other common serving sizes of Cheddar Cheese including 1 cubic inch and 1 oz. View calories and nutrition info per 1 Slice/10g of Cathedral City Mature Cheddar Cheese and see how many calories are in g of Cathedral City Mature. Depends on the brand/type of cheddar, and the size of the slice. Pre-sliced cheddar typically runs about calories per slice.