Every font is different, some have thinner lines or taller lines, etc. You may need to look at the actual thickness of the smallest point of the letter to get a good sense of the size. Check out how different these fonts look even though they're printed at the same size.
Real World Examples of Different Size Fonts
You can always try printing your font out to see what it looks like in real life. We've put a few different sizes to the test and put them on a shirt so you don't have to! Check out the sizes below - but remember different fonts may print at different sizes, the photos below are only to give you a point of reference.
The fonts start at 8pt, 10pt, 12pt, 14pt, 16pt, 18pt, 24pt, and 36pt. See the detail below.
Here is what 72 pt and 100 pt look like on a standard tshirt.
More Tips & Tricks - The Smaller You Go, The More Space Between
Character spacing is also crucial to how legible your font will be in your artwork. The smaller the font, adding more space between each letter will allow the reader to see each letter more clearly.
See how it is easier to read the font on the right which has more space between each letter? Even though it is smaller, the space allows the eyes to focus on the words and more easily process the information.
Now you know how a few best practices to keep in mind when creating artwork using fonts.
Go forth and conquer!