How Many Cups of Coffee Can You Brew From a 12 oz Coffee Bag? (UK / London Guide)

You are not alone when you have ever wondered how much a 12 oz bag of coffee will get you to take while you are in your cafe, in your kitchen or in your work place. The number of cups you will be able to brew using a 12 oz (about 340 g) bag depends on the method of brewing, cup size, the strength of the coffee that you prefer and the coffee to water ratio. The figure below is a simple calculation that will enable you estimate the production of coffee.

What “12 oz” Means for Coffee Brew

The weight of the coffee in the bag after it is roasted is 12 oz, which is approximately 340 g. It is one of the commonest retail sizes of specialty coffee since it is easy to brew at home and the consumer can enjoy the coffee until the bag is exhausted.

How Many Cups Can a 12 oz Coffee Bag Make?

Standard Estimate

• Using common brewing ratios, a 12 oz coffee bag typically yields about 17–24 cups of brewed coffee.

• If you use a standard coffee-to-water ratio (such as 10 g per 6-oz cup), a 12 oz bag can produce around 34 small 6-oz cups or 17 mugs of 12 oz coffee.

Common Ranges by Cup Size

• Smaller cups (~6 oz / 180 ml): ~30–35 cups per bag

• Medium mugs (~8 oz / 240 ml): ~23–26 cups per bag

• Large mugs (~12 oz / 350 ml): ~15–20 cups per bag

🔎 Note: The number above can change based on how strong you like your coffee and your chosen brewing method (Pour-Over, French Press, drip machine, etc.).

What Influences the Number of Cups?

Grinding and Brew Method

Different methods use different amounts of coffee per cup. For example:

• Espresso: Very concentrated and uses more coffee per ounce, so the same bag yields more servings, but they are smaller shots.

• French Press / Pour-Over: Uses a medium ratio and produces robust, flavourful cups.

Coffee Strength

How strong you like your coffee matters:

• Stronger brew: Requires more coffee grounds per cup → fewer total cups.

• Weaker brew: Requires less coffee → more cups per bag.

Cup Size Definitions

The definition of a cup varies in different ways, across coffee makers and cafes. An average 6 oz coffee cup is less than most domestic size mugs in the UK cafes (8 to 12 oz). The bigger the size of the cup, the more cups you will be able to brew out of that one bag.

Practical Example (UK / London Context)

If you drink your coffee from typical UK mug sizes (~8 oz/240 ml):

• A 12 oz bag is likely to make around 23–26 mugs of coffee, using a balanced coffee-to-water ratio and everyday brew methods.

• If you prefer a stronger cup, expect closer to 17–20 mugs.

For cafés serving in standard large takeaway cups (12 oz+) in London or major UK cities, a 12 oz coffee bag will stretch well for daily brewing — provided you dial in your recipe consistently.

Tips to Maximize Brew Yield

Use a kitchen scale: Weighing coffee and water gives the most accurate yield and strength.
Grind fresh: Fresh grinding just before brewing preserves flavour and ensures a consistent extraction.
Store properly: Keep your beans in an airtight container away from light and moisture to preserve freshness.

Summary

• A 12 oz coffee bag typically yields 17–24 cups of brewed coffee, depending on your cup size and strength level.

• Standard mugs (~8 oz) often yield around 23–26 cups.

• Brewing preferences and method impact the final count — stronger coffee uses more grounds, reducing total cups.

This is a guide regardless of whether you are going on to brew weekly on your own or are estimating the supply of the cafe to customers in London, Manchester, or the UK in general and are planning to make the most out of each 12 oz bag.