The average volume of a coffee mug is between 8 to 15 oz. Coffee mugs hold more liquid than a typical cup or a more formal teacup. Striped coffee mugs are a flashy addition to your kitchen and come in multiple sizes, sometimes capable of holding 20 to 25 oz. of liquid which is closer to the volume of a standard latte mug.
If you decide to take your morning coffee on the road after a few sips, you’ll notice that you have room to add more liquid when you transfer it from the mug to a travel mug. A standard travel mug or tumbler can hold 15 to 20 oz. of liquid.