THE SHORT ANSWER
There is no single caffeine number for a cup. The FDA gives a typical range of 113–247 mg for 12 US fluid ounces of regular brewed, non-specialty coffee. Size, beans, dose and recipe all matter.
First, define your cup
A tiny hotel cup and a travel tumbler are different servings. Write down the actual drink size before comparing labels. Then check whether the number refers to a single shot, a double shot, one serving or the whole container. Adding milk changes concentration but does not remove the caffeine already in your espresso.
Use numbers with context
The FDA cites 400 mg per day as an amount not generally associated with negative effects for most adults. That is not a target or a limit appropriate for everyone: sensitivity, medicines, pregnancy and health conditions can change the picture. Decaf also contains some caffeine. Ask your clinician about your own circumstances.
A better ordering habit
If caffeine content matters to you, ask for product-specific information and count the shots. Do not use bitterness, roast colour or the word strong as a caffeine meter. Those describe a sensory impression, not a laboratory result.
Change one thing, taste, and keep a short note. A recipe becomes useful when you can repeat the cup you enjoy.
Try it for yourself
Sources & further reading
Source links support the factual context. Our home recipes and tasting suggestions are identified as starting points.