How Many Calories Are Actually in a Glass of Port?

A small glass of Port at the end of a meal feels like a modest thing, so it's easy to assume the calorie count is modest too. Ounce for ounce, it isn't, though the full picture is more forgiving than that first fact suggests.

The actual number

A standard 60ml serving of Port comes in at roughly 130 to 150 calories, depending on the style and residual sugar. That's higher, ounce for ounce, than a glass of table wine, which sits around 120 to 125 calories for a much larger 150ml pour. The reason is straightforward: Port carries both more alcohol and more sugar per ounce than a standard wine, and both of those contribute calories.

Why the comparison isn't as bad as it first looks

Here's the part that changes the maths. A standard glass of wine is roughly 150ml. A standard serving of Port is 60 to 90ml, closer to a third of that. So while Port is denser in calories per ounce, a proper Port serving actually contains fewer total calories than a full glass of table wine, not more. The small glass isn't just about strength and tradition; it happens to work in your favour here too.

Does the style make a difference?

Slightly. Tawny and Vintage Ports tend to sit at the higher end of that range, given their sugar content, while drier White Port served as an aperitif can come in a touch lower. None of the differences between styles are large enough to change how you'd think about a single glass.

The number that actually matters isn't the calorie count in isolation. It's the serving size that Port has quietly enforced for centuries, long before anyone was counting: small, slow, and meant to be the last thing in the glass rather than the first of several.