A shot is typically measured as 1.5 oz, therefore there would be 103.5 calories in one standard shot of Patron Silver tequila. There are 69 calories per serving of Patron Silver tequila, which is 1 oz. A shot is typically measured as 1.5 oz, therefore there would be 103.5 calories in one standard shot of Patron Silver tequila. There are 69 calories per serving of Patron Silver tequila, which is 1 oz.