How Many ML Is One Serving of Whiskey?

November 14, 2025 •

4 min read

A standard shot of whiskey in the United States is 1.5 fluid ounces, which translates to approximately 44 milliliters. Knowing how many ml is one serving of whiskey is essential for mixing cocktails, managing your intake, and appreciating the nuance of your dram.

Quick Summary

The standard serving size for whiskey varies widely depending on your location, ranging from 25ml in the UK to 44ml in the US. The type of drink, whether a cocktail or neat pour, and alcohol content also dictate the volume.

Key Points

US Standard: A standard single serving or shot of whiskey in the US is 1.5 fluid ounces, equivalent to approximately 44ml.
UK Standard: In the UK, a single measure of spirits is typically 25ml, with a double being 50ml, though some pubs serve larger 35ml or 50ml singles.
International Differences: Standard serving sizes are not universal, with variations like Ireland's 35.5ml single shot, influenced by local laws and customs.
Neat vs. Shot: A neat pour meant for sipping is often a more generous 2 ounces (approx. 59ml) to enhance flavor, while a shot is a specific, smaller measure for quick consumption.
Use Measuring Tools: For accuracy and consistency at home, use proper measuring tools like a jigger to avoid over-pouring, which is especially important for cocktails.
Responsible Consumption: Regardless of the serving size, it's crucial to be aware of alcohol content (ABV) and recommended weekly intake guidelines, as measures can differ unexpectedly.

Standard Serving Sizes: A Global Perspective

While the concept of a "standard serving" seems straightforward, the actual measurement for how many ml is one serving of whiskey is far from universal. Legal regulations, cultural norms, and even the type of drink can all influence the volume. This section breaks down the most common standards you'll encounter.

United States vs. United Kingdom Standards

In the United States, a standard single shot, or jigger, is typically 1.5 fluid ounces, which equates to approximately 44 milliliters. For a double, this measurement is typically doubled to around 88 milliliters. This standard is widely used in bars and for cocktail recipes, making it a familiar starting point for many drinkers. However, it's important to note that individual establishments may have slight variations, with some pouring a larger or smaller shot.

In contrast, the United Kingdom operates on a different system. Here, a standard single measure of spirits is 25 milliliters. A double measure is therefore 50 milliliters. This metric-based system is mandated by UK law and makes calculating units of alcohol quite precise, as one 25ml measure of 40% ABV spirit contains exactly one unit of alcohol. Some UK pubs have started using larger 35ml or 50ml single measures, which can alter unit counts and may catch some consumers by surprise.

Other International Variations

Beyond the US and UK, other countries have their own norms. In Ireland, for instance, a single whiskey shot is slightly larger than the UK's standard at 35.5ml. A double in Ireland comes in at 71ml. These differences highlight the importance of being aware of local pouring traditions, especially when traveling. The European Union has also influenced bottle sizes, leading to the common 700ml standard in Europe compared to the 750ml standard often found in the US. This reflects the global lack of complete standardization, which has historical and regulatory roots.

The Difference Between a Shot and a Neat Pour

How the whiskey is served also dictates the quantity. A shot, which is meant for quick consumption, adheres to the established standards of 25ml to 44ml, depending on the country. However, a neat pour, which is meant to be savored slowly, is often a more generous serving. For whiskey neat or on the rocks (over ice), a typical serving might be 2 fluid ounces, or roughly 59ml. Bartenders and whiskey connoisseurs often pour this larger amount to allow the spirit's aroma and flavors to open up properly in the glass.

Tools for Measuring the Perfect Pour

For those pouring at home, using the right tools can ensure you consistently measure the correct amount. This prevents both over-pouring and under-pouring, which is crucial for both responsible drinking and for maintaining a consistent taste in cocktails.

Jiggers: These hourglass-shaped measuring cups are a bartender's best friend. The standard size typically has a 1.5oz (44ml) side and a 0.75oz (22ml) side, though other variations exist.
Shot Glasses: While commonly used, shot glasses are not always a precise measuring tool as their volume can vary. If you rely on one, it is wise to verify its specific capacity with a jigger first.
Free Pour Spouts: Experienced bartenders can free-pour a consistent amount by using a pour spout and counting. For beginners, however, this technique can be unreliable and lead to incorrect servings.
Measuring Cups: Small liquid measuring cups, like those used for baking, can offer another reliable way to measure precise amounts in milliliters at home.

International Whiskey Serving Size Comparison

To better illustrate the differences, here is a comparison table of standard single whiskey measures in different regions:


Region	Standard Single Pour	Approx. Milliliters (ml)
United States	1.5 fluid ounces	44 ml
United Kingdom	25 milliliters	25 ml
Ireland	35.5 milliliters	35.5 ml
European Bartender School	25 milliliters	25 ml

Conclusion

The question of "how many ml is one serving of whiskey?" has no single, universal answer. From the 44ml single shot in the US to the 25ml measure in the UK, standards differ significantly across the globe due to varied regulations and traditions. Furthermore, the serving style, whether a quick shot or a leisurely neat pour, also impacts the volume. For anyone looking to mix a perfect cocktail or simply enjoy a dram responsibly, the key is to be aware of the local standards and use proper measuring tools. This attention to detail will ensure a more consistent and enjoyable whiskey experience, no matter where you are in the world. Being mindful of these nuances allows for better control over your consumption and a deeper appreciation for the spirit. An excellent resource for more information on responsible drinking is the Drinkaware website, available here.

This article is for informational purposes only and is not intended to promote excessive alcohol consumption. Please drink responsibly.

Frequently Asked Questions

A shot is a specific, smaller serving (e.g., 44ml in the US) intended for quick consumption, often in a shot glass. A neat pour, on the other hand, is usually a more generous serving (often 59ml in the US) poured into a larger rocks glass for slow, thoughtful sipping.

In countries following the UK standard, yes, a double measure of whiskey is 50ml, as a single is 25ml. However, in the US, a double would be 3 fluid ounces, or roughly 88ml, based on the standard 1.5oz shot.

The definition of a 'standard drink' varies. For example, in the US, it is considered 1.5 fl oz (44ml) of 40% ABV hard liquor, while in Canada, it's a 43ml (1.5oz) shot.

A jigger is an hourglass-shaped measuring tool used in bartending to ensure precise pours. Using a jigger, which often has different measurements on each side (e.g., 1.5oz and 0.75oz), guarantees consistent serving sizes for cocktails and responsible pouring.

If you don't have a jigger, you can use a small kitchen measuring cup that has metric markings. Alternatively, a standardized shot glass can work, but it's best to verify its volume first, as capacities can differ.

Yes, alcohol by volume (ABV) is a crucial factor, especially for countries that use a 'unit' system. For instance, a 25ml single measure of 48% ABV whiskey in the UK contains more units of alcohol than a 25ml measure of 40% ABV whiskey.

Historically, regulations and market preferences dictated different sizes. Since 1990, EU regulations mandated 700ml bottles for spirits, whereas the US standardized on 750ml, a size close to the historic 'fifth' of a gallon.