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Making Sense of Ounces to Millilitres in Coffee

Making Sense of Ounces to Millilitres in Coffee

Apr 18, 2024 2 min(s) read

When it comes to finding the perfect reusable cup for your daily coffee – getting the ratio of coffee to milk is essential, ‘barista standard’ as we say at KeepCup.

Navigating the names given to sizes – small, medium, large, venti as well as "ounces to millilitres" can be confounding. KeepCup has you covered with a wide range of options to simplify your search and enhance your sustainable drinking experience.

Understanding Ounces to Millilitres

First question, metric of imperial ounces?

It's useful to understand the ounces to millilitres conversion. Ounces (oz) and millilitres (ml) are two common units of measurement for liquids. The conversion is: 1 fluid ounce (oz) is approximately equal to 29.57 millilitres (ml).  To complicate this further, there are Metric and Imperial ounces that deliver a different conversion.

For example – 12 Metric fluid ounces converts to 227ml and 12 Imperial fluid ounces converts to 236ml. The larger the size the greater the variation. At KeepCup we have used a metric conversion.

Exploring KeepCup's Range

Original KeepCup

The Original KeepCup is available in various sizes, including 4oz (118ml), 6oz (177ml), 8oz (227ml), and 12oz (340ml) and 16oz (454ml). These cups are perfect for coffees on the move.

Brew and Brew Cork

If you're a fan of the coffee brewing process, the Brew Series offers 6oz (177ml) and 8oz (227ml). 12oz (340ml) and 16oz (454ml) glass is awesome to enjoy the full sensory experience of your beverage. These cups come with a tempered glass body and a cork or silicone band.


For those who love hot or cold beverages on the go, KeepCup's Thermal Range offers a 6oz (177ml), 12oz (340ml) and 16oz (454ml). The insulation keeps your drink at the desired temperature.


For an insulated leakproof experience 8oz (227ml), 12oz (340ml) and 16oz (454ml) sizes with a screw fit lid for secure carry. The Traveller has an optional Bottle Lid.

Bottles and Kits

Our unique dual opening bottles come in 14oz (420ml), 18oz (530ml) and 22oz (660ml) with insulated and lightweight combinations available.


When searching for the perfect reusable cup and considering the conversion from ounces to milliliters, KeepCup's product range ensures that you'll find a cup that meets your needs and helps reduce single-use plastic waste.  

If you’ve invested in a high-quality product like a KeepCup, you’re more likely to wash your cup, remember it when you leave the house and build a reuse habit.