Why are there Lines on Starbucks Cups?

The lines on Starbucks cups are measurements

The lines on Starbucks cups are measurements

They help baristas make drinks by measuring ingredients

They help baristas make drinks by measuring ingredients

The bottom line marks 8 fluid ounces

The bottom line marks 8 fluid ounces

The middle line marks an additional 4 fluid ounces

The middle line marks an additional 4 fluid ounces

The top line marks an additional 4 fluid ounces

The top line marks an additional 4 fluid ounces

The extra space at the top is to make room for ice

The extra space at the top is to make room for ice