abbreviations with spaces in between (e. g.)

Putting spaces between letters in multi-letter abbreviations-e.g., writing "e. g." or "U. S."-almost always looks like a typo. Readers and style guides expect the letters to be collapsed into a single unit (e.g., e.g., i.e., U.S., Ph.D.).

Below are clear rules, practical rewrites, and many copy-paste wrong/right pairs you can use for work, school, or casual writing.

Quick answer

Do not insert internal spaces inside multi-letter abbreviations. Write e.g., i.e., U.S., Ph.D. instead of e. g., i. e., U. S., Ph. D. Choose a style for periods and capitalization (AP, Chicago, APA) and apply it consistently, but never split abbreviation letters with spaces.

e.g. not e. g.; i.e. not i. e.; U.S. not U. S.
If unsure, replace the abbreviation with the full phrase (for example, that is).
Run a grammar check or a document-wide find-and-replace for common spaced forms.

Core explanation: why internal spaces are wrong

An abbreviation functions as a single lexical unit. Inserting spaces breaks that unit's visual signal, slows reading, and can confuse punctuation and parsing tools.

Internal spaces make letters look separate instead of a compact shorthand.
They can cause software or readers to misplace commas, periods, or sentence breaks.
Style guides disagree about periods and capitalization but agree that internal spaces are errors.

Wrong: She loved fruit, e. g., apples and pears.
Right: She loved fruit, e.g., apples and pears.

Spacing rules and style-guide variations

AP, Chicago, MLA, and APA vary on whether to use periods in acronyms and initials (PhD vs. Ph.D.), but they all collapse internal spaces. Decide which guide fits your audience and be consistent about periods and capitalization.

Chicago: e.g., Ph.D., U.S.
AP: favors fewer periods in some acronyms (NASA), but still no internal spaces in initials.
APA: uses e.g., i.e.; no internal spaces.

Usage (Chicago): The survey (e.g., Table 2) shows trends.
Usage (AP-style): He works for NATO; the U.S. provided support.

Grammar: punctuation, capitalization, and how spacing breaks rules

Punctuation such as commas and semicolons follows the abbreviation: write e.g., not e. g.,. If an abbreviation ends a sentence, the abbreviation's final period also serves as the sentence-final period-don't add another.

Write: "We like citrus, e.g., oranges." NOT "e. g.,".
Sentence end: "He is a Ph.D." - no extra period after the abbreviation.
Capitalization follows the original term (Mr., Dr., U.K.).

Wrong: Bring your passport, i. e., the photo ID needed.
Right: Bring your passport, i.e., the photo ID needed.

Real usage and tone: work, school, and casual differences

Formal writing (reports, manuscripts) should use conventional collapsed forms and follow a relevant guide. Neutral writing often tolerates fewer periods (PhD). Casual writing can be looser (eg), but internal spaces still look incorrect.

When clarity matters-job applications, graded essays, submissions-prefer the full phrase instead of an abbreviation that might confuse readers.

Formal/work: e.g., i.e., Ph.D., U.S. (follow your guide)
School/academic: e.g., i.e., follow your instructor or journal style (Chicago/APA common)
Casual: eg or e.g. are common; never use e. g.

Work (wrong): "Please see metrics, e. g., conversion rates last quarter." → Right: "Please see metrics, e.g., conversion rates last quarter."
School (wrong): "Several studies (e. g., Smith 2019) support the claim." → Right: "Several studies (e.g., Smith 2019) support the claim."
Casual (wrong): "I like pizza (e. g. pepperoni)." → Right: "I like pizza (eg or e.g. pepperoni)."

Try your own sentence

Test the whole sentence rather than just replacing the short form. Context often shows whether an abbreviation belongs or whether the full phrase reads better.

Rewrite help: three quick steps to fix a spaced abbreviation

Fix a spaced abbreviation in three actions: remove internal spaces, apply your style for periods and capitalization, then fix adjacent punctuation. If uncertain, replace the abbreviation with the full phrase.

Step 1: Delete internal spaces: e. g. → e.g.
Step 2: Apply periods/capitalization: Ph. D. → Ph.D. or PhD per guide.
Step 3: Place punctuation outside the abbreviation: e.g., not e.g .

Rewrite (work): Wrong: "You should bring ID, e. g. a passport." →
Fixed: "You should bring ID (e.g., a passport)."
Rewrite (school): Wrong: "This is unclear, i. e., it needs fixing." →
Fixed: "This is unclear; it needs fixing." (avoids abbreviation)
Rewrite (casual): Wrong: "We visited U. K., France, and Spain." →
Fixed: "We visited the U.K., France, and Spain."

Examples: realistic wrong/right pairs you can copy

Use these templates. Each wrong sentence shows the spaced-abbreviation mistake; the right sentence shows the corrected form. Some rewrites avoid abbreviations for clarity.

Wrong: The budget, e. g., line items for travel must be approved. -
Right: The budget, e.g., line items for travel must be approved.
Wrong: Bring your ID, i. e., passport or driver's license. -
Right: Bring your ID, i.e., passport or driver's license.
Wrong: She earned her Ph. D. last summer. -
Right: She earned her Ph.D. last summer.
Wrong: We shipped it to the U. S. office. -
Right: We shipped it to the U.S. office.
Wrong: Please address the letter to M r. Davis. -
Right: Please address the letter to Mr. Davis.
Wrong: Cite the article with et. al. when necessary. -
Right: Cite the article with et al. when necessary.
Work - Wrong: "Please see metrics, e. g., conversion and retention." - Work -
Right: "Please see metrics, e.g., conversion and retention."
School - Wrong: "Many sources (e. g., Johnson 2018) support this." - School -
Right: "Many sources (e.g., Johnson 2018) support this."
Casual - Wrong: "I'll bring snacks (e. g. chips, fruit)." - Casual -
Right: "I'll bring snacks (eg or e.g. chips, fruit)."
Rewrite:
Original: "We need supplies, e. g., pens and paper." →
Rewrite: "We need supplies - for example, pens and paper."
Rewrite:
Original: "This is unclear, i. e., needs revision." →
Rewrite: "This is unclear and needs revision."
Rewrite:
Original: "Several countries (U. K., U. S., France) responded." →
Rewrite: "Several countries (U.K., U.S., France) responded."

Memory tricks and quick fixes

Keep two rules in mind: letters inside an abbreviation stay together, and punctuation follows the abbreviation. If you spot a space between letters, remove it and read the abbreviation aloud as one unit.

Rule: No internal spaces (e. g. → e.g.).
Trick: Substitute the full phrase if it improves clarity ("for example" instead of e.g.).
Bulk fix: search-and-replace common spaced forms (e. g. → e.g.; i. e. → i.e.) and then review each result for context.

Quick replacements: e. g. → e.g.; i. e. → i.e.; Ph. D. → Ph.D.

Similar mistakes and hyphenation/spacing pitfalls

Writers who insert internal spaces in abbreviations often make related spacing errors: extra spaces before punctuation, inconsistent initials, or confusing hyphens and dashes with abbreviation formatting.

Remember: hyphens join words (well-being), dashes set off clauses (-), and apostrophes form contractions (don't). These functions are separate from abbreviation formatting.

Avoid extra space before commas/periods ("word ,").
Initials: be consistent - J.R.R. Tolkien or J. R. R. Tolkien per your chosen style; don't mix forms like "J. R.R."
Hyphens/dashes: no internal spaces inside words; dash spacing varies by style but is not a substitute for abbreviations.

Wrong: "e. g. - the result" (splits abbreviation and misuses dash). -
Right: "e.g. - the result" or "e.g., the result" depending on emphasis.
Wrong: "J. R.R. Tolkien" (mixed spacing). -
Right: "J.R.R. Tolkien" or "J. R. R. Tolkien" per style; avoid mixing.

FAQ

Should "e.g." have spaces between the letters?

No. Standard usage is e.g. without internal spaces. When it introduces examples, follow it with a comma: e.g.,

Is "i. e." acceptable?

No. Use i.e. without internal spaces. For clarity, you can write "that is" instead of i.e.

How should I write "Mr" or "Mr." and is "M r" ever correct?

American styles typically use "Mr." with a period; some British styles use "Mr" without a period. Never write "M r" with a space.

Why does my editor flag "e. g." as an error?

Editors flag internal spacing because it breaks the abbreviation into separate tokens. They recommend collapsing letters to the conventional form (e.g.,) and adjusting punctuation.

How do I format country initials like "U.S." or "UK"?

Follow your chosen style guide. Some guides use "U.S." with periods; others prefer "US" or "UK" without periods. In all cases, avoid "U. S." with internal spaces.

Want to check a sentence now?

Paste your sentence into a grammar checker to spot spaced abbreviations and inconsistent periods. For frequent editing, run a document-wide find-and-replace for spaced forms (e. g., i. e., Ph. D.) and then skim each result to confirm context.