Two Letters, Two Different Jobs
E.g. means for example: it introduces one or more possibilities. I.e. means that is: it restates or clarifies exactly what you mean. The easiest way to choose is to replace the abbreviation with its English meaning. If “for example” fits, use e.g.; if “that is” fits, use i.e.
That sounds like a tiny distinction—until you’re writing instructions, an invitation, or a work email. “Bring a snack (e.g., fruit)” suggests that fruit is one option. “Bring a snack (i.e., fruit)” says fruit is what you mean by “a snack.” One abbreviation leaves the choice open; the other narrows it.
E.g. Opens the Door to Examples
E.g. abbreviates the Latin exempli gratia, meaning “for the sake of example.” You don’t need to remember the Latin to use it well. Think: examples given, not every example possible.
The garden attracts pollinators (e.g., bees and butterflies).
Bees and butterflies illustrate the point. The sentence doesn’t claim they’re the only pollinators in the garden. You could also write, “The garden attracts pollinators, such as bees and butterflies,” without changing the basic meaning.
E.g. is especially useful when naming a couple of items will make a broad category easier to picture:
Add a crunchy topping (e.g., toasted seeds or chopped nuts).
Try a quiet activity (e.g., reading or sketching) while you wait.
In each case, the reader can choose something else that fits the category. That flexibility is the clue. If your list is meant to suggest possibilities rather than set boundaries, e.g. is doing its job.
I.e. Pins Down Your Meaning
I.e. abbreviates the Latin id est, meaning “that is.” Use it when the words that follow explain, identify, or rephrase what came before—not when they merely offer a few examples.
The workshop begins at midday (i.e., noon).
Here, “noon” is another way to say “midday.” It isn’t one example of midday among many. Likewise:
Please use the rear entrance (i.e., the door beside the loading bay).
The phrase after i.e. tells readers which entrance you mean. It removes uncertainty rather than offering a suggestion.
Sometimes the difference comes down to what you know about the situation. Compare “Invite a team member (e.g., Priya)” with “Invite the team lead (i.e., Priya).” In the first sentence, Priya is a possible invitee. In the second, Priya is identified as the team lead. The name stays the same, but the instruction changes.
The Swap Test That Catches Mistakes
When you hesitate, read your sentence aloud with for example or that is in place of the abbreviation. Merriam-Webster recommends this substitution as a quick way to check which meaning fits.
Consider this sentence:
We’ll visit a coastal city (e.g., Portland).
“We’ll visit a coastal city—for example, Portland” leaves open the possibility of another city. If Portland is already the decided destination, write:
We’ll visit a coastal city (i.e., Portland).
Now “that is, Portland” identifies the city. Better yet, if there’s no reason to build suspense, write, “We’ll visit Portland.” An abbreviation should help the reader, not make a simple fact harder to find.
The swap test also catches a subtler problem: an explanation that doesn’t truly match the thing it explains. “Bring identification (i.e., a driver’s license)” suggests that a driver’s license is the identification required. If a passport would work too, e.g. is more accurate—or you could spell out the accepted documents.
Why the Mix-Up Matters
In casual writing, readers may work out what you intended. In instructions, though, a swapped abbreviation can change whether a list sounds optional or complete.
Imagine an event notice that says:
Guests may bring a dessert (e.g., cookies or brownies).
Cookies and brownies are suggestions. Someone might bring a pie. Change e.g. to i.e., and the notice sounds as though “a dessert” means cookies or brownies specifically. If those are the only permitted choices, say so plainly: “Guests may bring either cookies or brownies.”
This is a useful reminder that correctness isn’t only about memorizing definitions. It’s about asking what a reader will do with your sentence. Words Trivia’s guide to commonly confused words explores other small choices that can shift a message.
Punctuation Without the Fuss
In American writing, you’ll commonly see periods in both abbreviations and a comma immediately afterward: e.g., and i.e., The Chicago Manual of Style follows that pattern, though conventions can vary by style guide. If you’re writing for a publication, school, or workplace, check its preferred style.
Parentheses often give these short clarifications a comfortable home:
Pack something warm (e.g., a sweater or light jacket).
Meet at the main entrance (i.e., the doors facing the square).
You can also skip the abbreviation when the full English phrase reads more naturally. Chicago generally favors “for example” and “that is” in running text, reserving the abbreviations for places such as parentheses and notes. The MLA Style Center’s guide to e.g. and i.e. likewise generally recommends them within parentheses.
Avoid adding etc. to the end of an e.g. list. E.g. already tells readers the items are examples, so “e.g., apples, pears, etc.” usually says the same thing twice.
For more on how small marks guide a reader through a sentence, see Words Trivia’s guide to punctuation marks.
The Rule to Remember
Before you type either abbreviation, ask one question: Am I giving possibilities, or am I defining what I mean? Possibilities call for e.g.; a restatement calls for i.e. If neither feels clear, write “for example” or “that is”—or rewrite the sentence without either one.
These abbreviations may be tiny, but they carry different promises to the reader. Use the right one, and your sentence says exactly what you intended.