There is one rule, and it covers nearly every cocktail you'll ever make:
Shake when the drink has citrus, dairy, or egg. Stir when it's all spirits, sugar, and bitters or vermouth.
That's it. Memorize that and you'll be right 95% of the time. The rest of this guide is why the rule exists, how long to do each, and how to handle the edge cases.
Why the rule exists
Shaking and stirring aren't two ways of doing the same thing. They're solving different problems.
Shaking does four things at once: chills hard and fast, dilutes a lot, aerates the drink (introduces tiny air bubbles), and emulsifies anything thick — citrus, syrup, cream, egg white. The result is cold, frothy, slightly cloudy, and lighter on the palate. That's exactly what a Daiquiri or a Whiskey Sour needs. Bright, lifted, foamy.
Stirring chills and dilutes with almost zero aeration. The drink stays clear, dense, glossy, and full-textured. That's exactly what a Manhattan or Martini needs — you want the spirit's weight and clarity, not a foam.
Use the wrong technique and you fight the drink. A shaken Manhattan looks like dirty pond water and tastes thin. A stirred Daiquiri is flat, warm, and undiluted because you can't move enough heat through citrus and syrup with a spoon.
Dilution targets
Both techniques have a goal beyond "cold." They're adding a specific amount of water to the drink. That water is part of the recipe — classic ratios assume a certain dilution. Under-dilute and the drink is hot and harsh. Over-dilute and it's washed out.
Technique
Target dilution
Why
Stirred
~20-25%
Spirit-forward drinks need just enough water to soften the alcohol burn without losing weight
Shaken
~25-30%
Citrus and sugar can absorb more water; the aeration also makes a slightly wetter drink feel right
You can't measure dilution in real time. You're hitting it by feel and time. Which is why time matters.
How long to shake
8 to 12 seconds. Hard.
The tin should be painfully cold and frosted on the outside by the time you stop. Your goal is to break up the ice, not just rattle it. A short, vigorous shake beats a long, gentle one — the more ice fragments you create, the faster the drink chills and dilutes.
You don't need a special technique. You don't need the "Hard Shake" — the famous Kazuo Uyeda move with the figure-8 wrist motion. It's a great party trick that does basically nothing different from a normal vigorous shake, despite what bartender forums claim. Shake hard, hold the tins firmly, and stop when it hurts your hands.
The Whip Shake
When a recipe has citrus or dairy but you're going to top with soda or carbonation later (a Tom Collins or a fizz), do a whip shake — shake with just two or three small ice pebbles for 4-5 seconds. You're emulsifying and chilling lightly without over-diluting, because the soda will dilute further. Then strain over fresh ice and top.
Dry shake (egg white)
For sours with egg white — Whiskey Sour with a foam, Pisco Sour, Amaretto Sour — shake without ice first (the "dry shake") for 10 seconds to whip the egg, then add ice and shake again for another 10. The egg foam needs the no-ice shake to set up properly. With ice from the start it'll never get fluffy.
How long to stir
20 to 30 seconds.
Counterintuitively this is longer than a shake. Stirring transfers heat much less efficiently — you're moving ice around, not breaking it. That's the point. You want slow, controlled chilling without the violent dilution of a shake.
A 20-second stir on a Martini gets you cold, glossy, and around 22% diluted. 30 seconds for a heavier drink like a Negroni or Old Fashioned built with a sugar cube. Past 30 seconds you're just watering it down.
The motion: let the spoon ride against the inside wall of the mixing glass. Spin the shaft between your fingers without flexing your wrist. The ice should rotate as one column. If it's clattering chaotically, you're moving the spoon, not the ice.
The Bond exception (he's wrong)
James Bond orders his Martini "shaken, not stirred." It's a brand line. It's also bad cocktail advice.
A shaken Martini is cloudy, frothy, over-diluted, and slightly bruised — the gin's botanicals get beaten up by the aeration. You lose the silky, glassy texture that's the entire reason to drink one. Bond is ordering a worse drink on purpose.
The one situation where shaken-Martini logic kind of works: if the spirit is room-temperature and you need a fast chill at the cost of texture. But if your gin is in the freezer (it should be), there's no excuse.
The decision flowchart
When in doubt, walk through this:
Does it contain citrus juice (lime, lemon, grapefruit, orange)? → Shake.
Does it contain cream, coconut cream, or any dairy? → Shake.
Does it contain egg white or whole egg? → Dry shake, then shake with ice.
Does it contain a syrup as a major component (orgeat, honey, simple at >½ oz)? → Usually shake, especially if there's also citrus.
Is everything clear and alcoholic, plus maybe a dash of bitters or a splash of vermouth? → Stir.
Are you topping with soda or sparkling wine? → Build the base in the glass (or whip-shake) and pour the bubbles last. Never shake carbonation.
A few honest exceptions
Espresso Martini — has no citrus or dairy in the strictest sense, but you absolutely shake it. The whole point is the foam from the espresso, which needs aeration to develop.
Gimlet — a gin-and-lime drink. Shake. The original Royal Navy version was sometimes stirred with cordial, but that's a historical curiosity.
Bloody Mary — roll it (pour back and forth between two tins) instead of shaking. A hard shake foams up the tomato juice and makes it weirdly thin. Roll for 10 seconds, you're done.
Next: if you don't have a proper mixing glass or shaker yet, start with Your First 5 Bar Tools. Once your technique is sorted, the right glass is what makes the drink look — and taste — like it should.