How to track alcohol calories

To track alcohol calories, count the alcohol itself at about 7 kcal per gram, then add anything mixed in with it. A pint of lager is roughly 180 to 240 kcal, a medium glass of wine is around 150 to 200 kcal, and a single spirit on its own is about 55 to 65 kcal before you add a mixer. Log the drink when you have it, not the next morning, because these calories are the ones people forget first. That is the whole idea. The rest is just knowing where the numbers come from.

Here is how it works in plain terms.

Why alcohol has calories at all

Alcohol is the fourth thing in food and drink that carries energy, alongside protein, carbs and fat. It sits at about 7 kcal per gram, which puts it between carbs at 4 and fat at 9.

So alcohol is nearly as calorie-dense as fat. Your body cannot store it, so it burns the alcohol first and puts everything else on hold while it does. That is one reason a few drinks alongside a meal can quietly nudge the scales.

The two parts of any drink

Every alcoholic drink is really two things stacked together, and you count both.

• The alcohol. This is the pure ethanol in the drink. More units means more alcohol, which means more calories.
• The mixer or the rest of the drink. Tonic, cola, juice, the sugar in a cider, the cream in a liqueur. These carry their own calories on top.

A gin on its own is light. A gin and full-fat tonic is a different story, because the tonic can add as much again. Diet mixers cut that second part close to zero, which is the easiest single swap if you are watching the total.

Rough calories for common drinks

These are ballpark figures. The real number depends on the strength, the measure and what is mixed in, so treat them as a starting point rather than gospel.

• Pint of lager or beer (568ml): around 180 to 240 kcal, higher for stronger craft beers.
• Medium glass of wine (175ml): around 150 to 200 kcal, red or white.
• Large glass of wine (250ml): around 220 to 280 kcal.
• Single spirit (25ml), on its own: around 55 to 65 kcal.
• Pint of cider: around 200 to 250 kcal, more for the sweeter ones.

Strength drives most of the difference. A 4% lager and a 6% craft beer look identical in the glass, but the stronger one carries noticeably more. When a label gives the ABV, a higher number means more calories in the same measure.

How to log each type

The trick is to match the actual measure to the actual strength, then add the mixer separately if there is one.

A pint. Log it as a pint of that specific beer or cider if you can. If not, pick the closest match by strength: a standard 4% lager, a stronger ale, a sweet cider. The strength is what matters most.

A glass of wine. Check the pour. A pub medium is 175ml, a large is 250ml, and a generous home pour can be bigger than either. Log the size you actually drank, not the size you meant to.

A spirit and mixer. Log the spirit by its measure, single or double, then log the mixer as a separate item. A double gin is two singles. Full-fat tonic and cola carry real calories, so they earn their own line.

Fettle (stayfettle.com) has these UK drinks built in, so you can search "pint of lager" or "glass of red wine" and log it in a couple of taps. It is free and there is no account to set up.

Why drink calories are the easy ones to forget

Alcohol calories slip through for a few honest reasons. You do not chew a drink, so it never registers as food. Rounds happen fast, and by the third one the count has gone fuzzy. And the calories that come with drinking often arrive later, in the crisps, the kebab or the fry-up the next morning.

The fix is simple: log the drink as you order it, while you still remember the measure. A quick tap at the bar beats trying to reconstruct a whole evening the next day. If you know a big night is coming, you can even leave a little room in your target for it, the same way you might for a large meal.

One honest note

These figures are general guidance, not medical advice. If you drink, the NHS suggests keeping it to no more than 14 units a week spread over a few days, with some drink-free days. That is a sensible frame, not a health claim. If you have a health condition, are pregnant, take medication, or have any concerns about your drinking, speak to your GP or a registered professional. Tracking the calories is about awareness, nothing more.