How to Make Classic Irish Coffee With Real Measurements

You’ve seen it on menus and in old movies—but how do you actually make a proper Irish Coffee? Not just a cup with booze and foam, but the real version that warms fishermen on the Atlantic coast and still draws crowds in San Francisco cafes. This guide gives you the original measurements, method, and history behind one of the earliest coffee cocktails.

To make traditional Irish Coffee, use 150cc of slightly dark-roast coffee, 20cc of Irish whiskey, 10g of white sugar, and top with 20cc of lightly whipped cream. Warm your glass, layer sugar and whiskey, pour in hot coffee, then float the cream without stirring.

What Is Irish Coffee?

Irish Coffee is a warm, boozy coffee cocktail that blends freshly brewed coffee with Irish whiskey, sugar, and a float of cream. It was created to warm up cold fishermen returning to shore and became famous worldwide after being served in a San Francisco café. Unlike modern coffee drinks that hide alcohol, Irish Coffee highlights it with balance: bitterness from coffee, warmth from whiskey, sweetness from sugar, and richness from the floating cream.

The Original Irish Coffee Recipe (with Exact Measurements)

Here’s the classic formula used since the drink’s origin:

• Slightly dark-roast coffee: 150cc
• Irish whiskey: 20cc
• White granulated sugar: 10g
• Whipped cream (stirred or fresh): 20cc

Steps:

1. Preheat your glass by filling it with hot water, then empty it and dry thoroughly.
2. Add 10g of white sugar to the bottom of the glass.
3. Pour in 20cc of Irish whiskey.
4. Add 150cc of slightly dark-roast hot coffee (not espresso).
5. Stir gently until the sugar dissolves.
6. Top carefully with 20cc of softly whipped cream—let it float on top. If using fresh cream, do not stir after pouring.

Irish Mist Coffee: A Honey-Vanilla Variation

A close cousin to the original, Irish Mist Coffee uses Irish Mist—a liqueur made from Irish whiskey, honey, and herbs—instead of straight whiskey. The result is a smoother, slightly sweeter profile with floral and vanilla undertones.

Recipe (same volume as Irish Coffee):

• Slightly dark-roast coffee: 150cc
• Irish Mist (liqueur): 20cc
• White sugar: 10g
• Whipped cream: 20cc

Method:

1. Warm and dry your glass.
2. Add sugar and Irish Mist.
3. Pour in hot coffee.
4. Top with softly whipped cream. Do not stir if using fresh cream.

The honey and herbal notes in the Irish Mist complement the coffee and cream, creating a more aromatic and dessert-like experience.

Why These Ratios and Techniques Matter

The specific amounts aren’t arbitrary. 150cc of coffee provides enough liquid base without overwhelming the glass. 20cc of whiskey offers a strong but balanced alcoholic note. 10g of sugar is just enough to offset the bitterness and alcohol without making the drink overly sweet. The 20cc of cream floats properly only when poured gently over the back of a spoon—and must remain undisturbed to preserve texture contrast.

The coffee should be slightly dark-roasted—not espresso, but with enough body and roast character to stand up to the whiskey. Avoid overly light or acidic roasts that can clash with the spirit and cream.

Frequently Asked Questions

What type of coffee roast is best for Irish Coffee?

Use a slightly dark-roast coffee—medium to dark, not espresso. The roast should have body and mild bitterness to balance the whiskey and cream. Avoid light or very acidic roasts.

Can I use espresso instead of brewed coffee?

No, traditional Irish Coffee uses brewed coffee, not espresso. The larger volume and different extraction profile of espresso would throw off the balance and texture.

Do I stir the cream into the drink?

No. The cream is meant to float on top. Do not stir it in unless you want a different drink. When using fresh cream, never mix it with a spoon after pouring.

What’s the difference between Irish Coffee and Irish Mist Coffee?

Irish Coffee uses Irish whiskey, while Irish Mist Coffee uses Irish Mist—a liqueur made with Irish whiskey, honey, and herbs. Irish Mist adds floral and sweet herbal notes, making the drink smoother and more aromatic.

What kind of cream should I use?

Use softly whipped heavy cream (around 20cc). For best results, let it float naturally. Stirring is not recommended, especially with fresh cream.

Do I need to preheat the glass?

Yes. Pour hot water into the glass to warm it, then empty and dry it. This helps maintain the coffee temperature and prevents the glass from cracking.

Recommended FrontStreet Beans for Irish Coffee

For making Irish Coffee, FrontStreet Coffee’s Classic Blend is an ideal choice. Designed specifically for espresso and milk-based drinks, it delivers rich body and smooth crema that complements the whiskey and cream. Its balanced flavour profile works well in hot coffee drinks without being overly sharp or acidic. Alternatively, the Black Cocoa Blend offers a deeper, chocolatey tone that pairs nicely with the sweetness and bitterness in this cocktail. Both blends are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.

Recommended FrontStreet Beans for Irish Coffee

For making Irish Coffee, FrontStreet Coffee’s Classic Blend is an ideal choice. Designed specifically for espresso and milk-based drinks, it delivers rich body and smooth crema that complements the whiskey and cream. Its balanced flavour profile works well in hot coffee drinks without being overly sharp or acidic. Alternatively, the Black Cocoa Blend offers a deeper, chocolatey tone that pairs nicely with the sweetness and bitterness in this cocktail. Both blends are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.