How many standard drinks in a cocktail?
Almost never just one. Most classic cocktails pack 1.5 to 2.5 standard drinks into a single glass — which is why cocktail nights are the easiest place to lose count of what you've actually had.
Beer and wine are easy: the label tells you exactly how many standard drinks are in the bottle or can — it's required on packaged alcohol in Australia. Cocktails have no label. They mix two or three alcoholic ingredients at different strengths, recipes vary from bar to bar, and the sugar, coffee or citrus on top hides how strong they really are.
This guide covers the typical standard-drink count for popular cocktails, the simple formula to work it out for any recipe, and how to keep an honest count on a night out.
First: what's a standard drink?
In Australia, one standard drink contains 10 grams of pure alcohol (about 12.5 ml), regardless of what kind of drink it's in. It's the unit the national guidelines use: the Australian guidelines recommend healthy adults have no more than 10 standard drinks a week and no more than 4 on any one day to reduce health risks.
A 30 ml pub shot of 40% spirit is just under one standard drink (about 0.9). That's the building block for everything below — and most cocktails contain two to three shots' worth of alcohol across their ingredients.
Standard drinks in popular cocktails
These estimates use classic recipes with standard 40% spirits. Your venue's version may differ — often upward.
| Cocktail | Typical recipe | Standard drinks |
|---|---|---|
| Gin & tonic (single) | 30 ml gin | ~0.9 |
| Aperol spritz | 60 ml Aperol, 90 ml prosecco | ~1.3 |
| Mojito | 45 ml white rum | ~1.4 |
| Espresso martini | 45 ml vodka, 30 ml coffee liqueur | ~1.9 |
| Negroni | 30 ml gin, 30 ml Campari, 30 ml vermouth | ~1.9 |
| Martini | 60 ml gin, 10 ml dry vermouth | ~2.0 |
| Margarita | 45 ml tequila, 30 ml triple sec | ~2.1 |
| Long Island iced tea | 60 ml mixed spirits, 15 ml triple sec | ~2.2–3+ |
Two takeaways. First, the "strong" reputation of a negroni and the dessert-like sweetness of an espresso martini hide the fact they're almost identical in alcohol — both close to two standard drinks. Second, three margaritas isn't three drinks; it's more than six standard drinks, past the daily guideline before you've thought about it.
The formula: count any cocktail yourself
The official Australian formula is simple. For each alcoholic ingredient:
volume (litres) × alcohol % (ABV) × 0.789 = standard drinks
(0.789 is the density of alcohol — it converts millilitres of alcohol into grams.) Add the ingredients together for the total. For a classic margarita:
- 45 ml tequila at 40%: 0.045 × 40 × 0.789 = 1.4
- 30 ml triple sec at 30%: 0.030 × 30 × 0.789 = 0.7
- Total: ~2.1 standard drinks
Cocktail ingredient calculator
Run each alcoholic ingredient through separately and add them up. Liqueurs typically run 15–30% ABV, vermouth ~15–18%, spirits 37–43%.
Why the same cocktail varies between venues
Unlike a stubbie of beer, a cocktail is made fresh by a human with a jigger — or without one. The count in your glass depends on the pour size (45 ml vs 60 ml of base spirit is a third more alcohol), the brand and strength of each liqueur, whether the bartender free-pours, and house recipes designed to taste generous. Jugs and fishbowls are worse: a shared cocktail jug can easily hold 8–10 standard drinks with no practical way to know how many ended up in your glass.
The fix is unglamorous but effective: ask what's in it. Any decent bar will tell you the shots and volumes, and thirty seconds with the formula above gives you a real number.
Cocktails and driving don't mix
At roughly two standard drinks each, a single cocktail can put many people at or over 0.05 — the limit for full-licence drivers in Australia, and well over the zero limit for learner and probationary drivers. Because cocktail strength is so variable, estimating your BAC after cocktails carries even more uncertainty than usual. If cocktails are on the menu, so is a ride home: don't drive.
Also worth knowing: alcohol keeps affecting you long after the glass is empty. Two espresso martinis late in the evening means both caffeine and roughly four standard drinks working against your sleep, and a longer wait until your BAC is back to zero.
How to keep count on a cocktail night
- Log the ingredients, not the glass. Count an espresso martini as two standard drinks, not one entry called "a drink".
- Alternate with water. Cocktails are often drunk faster than their strength deserves — a water between rounds slows the pace.
- Watch the jug. If you're sharing, pour into your own glass so you can at least estimate your share.
- Set a number before you go out. Decide your standard-drink limit while sober; two cocktails may be your whole budget.
Frequently asked questions
How many standard drinks are in an espresso martini?
About 1.9 — nearly two — for the classic 45 ml vodka + 30 ml coffee liqueur recipe. Venues that pour 60 ml of vodka push it to around 2.4.
Is a cocktail one standard drink?
Rarely. Most classics sit between 1.5 and 2.5 standard drinks. Counting each cocktail as "one drink" is one of the most common ways people underestimate a night out.
How do I calculate standard drinks in a cocktail?
Volume in litres × ABV × 0.789, for each alcoholic ingredient, then add them together. Or use the calculator above.
Why does the same cocktail vary between venues?
No standard recipes, no labels. Pour sizes, liqueur strengths and house styles all differ — ask the bartender what's in yours.
How many cocktails can I have and stay under the guidelines?
The Australian guidelines suggest no more than 4 standard drinks on any day — which two typical cocktails can reach. And no cocktail count makes driving safe; if you're driving, make it zero.