How many calories are in a rum?
A 25 ml (0.9 fl oz) measure of 40% rum is about 55 kcal, and a 50 ml double about 110. That holds for white, dark and spiced alike. The spread between rum drinks comes almost entirely from what is poured in after the rum.
Per portion
| Portion | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Single white rum, 25 ml, 40% | ~55 kcal | 0 g | 0 g | 0 g |
| Single spiced rum, 25 ml, 35% | ~50 kcal | 0 g | 0.5 g | 0 g |
| Double dark rum, 50 ml, 40% | ~110 kcal | 0 g | 1 g | 0 g |
| Double overproof rum, 50 ml, 57% | ~160 kcal | 0 g | 0 g | 0 g |
| Rum cream liqueur, 25 ml, 17% | ~80 kcal | 0.5 g | 6 g | 4 g |
What changes the number
White, dark or spiced — less than the labels suggest. White rum is spirit with nothing added. Many dark and most spiced rums do carry added sugar, and some spiced products are sold as “spirit drinks” at 35% rather than as rum. But even a generous 20 g of sugar per litre is half a gram in a 25 ml measure: two calories. The sugar in dark rum is not what makes a rum drink expensive.
Strength, which matters more. Overproof rums at 57–63% put 80–85 kcal into a 25 ml measure, half again as much as 40%. Spiced rums bottled at 35% go the other way.
Mixers and syrups, which matter most. Cola at 200 ml (7 fl oz) is about 85 kcal, ginger beer 90, pineapple juice 90, and coconut cream 200 kcal for 60 ml. Soda water, lime juice and diet mixers are 0–10. One tablespoon of sugar syrup is 45 kcal and most rum cocktails contain one.
Liqueurs wearing the word rum. Cream and coconut versions are bottled at 17–21% with sugar and fat added: about 80 kcal per 25 ml, a different panel entirely.
Where it fits in a deficit
Plain rum carries no protein, fibre or satiety, so its calories do nothing for appetite — the weakness of any drink that does not eat like food. What makes rum interesting is the range: the same 50 ml ends up in a 115 kcal drink or a 500 kcal one, and the glasses look alike.
Alcohol also changes which fuel the body burns first, separately from the calorie total — the beer page has it. Guidance on low-risk drinking limits is national and varies, so follow yours; this page covers energy content only.
The mixer is therefore the decision to make before the bar rather than at it — ordinary meal planning applied to a glass. Two rum and colas is 390 kcal against a calorie deficit of perhaps 500 a day.
The cocktail spread
| Drink | Calories | Where the extra sits |
|---|---|---|
| Rum, soda and lime, 50 ml | ~115 kcal | nothing added |
| Daiquiri | ~160 kcal | 45 in sugar syrup |
| Mojito | ~170 kcal | 50 in sugar; soda is free |
| Rum and cola, 50 ml + 200 ml | ~195 kcal | 85 in the cola |
| Piña colada, 250 ml | 400–550 kcal | 200–300 in coconut cream |
Every row above contains the same 50 ml of rum, worth 110 kcal. The top and bottom of the table differ by a factor of four, and none of that is the spirit.
A mojito is moderate not because it is pale and full of mint but because the sugar is measured and the soda is free. A piña colada is heavy because coconut cream is 20% fat, not because of the rum. Choosing a plain spirit over another changes nothing here. Choosing the mixer changes everything.
Figures are typical values and vary by variety, size and preparation. General information, not medical advice.