Choosing between “different from” and “different than” trips up writers, editors, and nonnative speakers alike. A small preposition can change tone, formality, and clarity-so it matters when you have to match a style guide, write for an academic audience, or simply want a sentence that reads smoothly.
Quick answer (TL;DR): Which is correct – “different from” or “different than”?
Default to “different from” in formal writing. It’s the safest, most widely accepted choice for academic, legal, and editorial prose. In informal contexts, “different than” is common and often clears up awkward clauses (for example, “different than I expected”).
Practical takeaway: if a following clause makes “from” awkward, either use “different than” for concision or rephrase the clause (e.g., convert it into a noun phrase). When unsure, prefer “different from”; it’s the least likely to raise style objections.
Grammar basics: why the confusion exists
The heart of the issue is grammar roles. “From” is primarily a preposition that links nouns and noun phrases; “than” is usually a conjunction introducing the second element in a comparison (and sometimes behaves like a preposition).
People expect a comparison after “different,” so “than” feels natural. But “different” isn’t a comparative adjective like “smaller” that requires “than.” That mismatch produces conflicting instincts: one to use a preposition with a noun phrase, another to use a conjunction for comparisons.
Whether a clause or a noun phrase follows “different” often determines which form reads better. Clauses (“different than I expected”) can make “than” look cleaner; noun phrases (“different from the others”) usually call for “from.”
Practical rules and clear examples
Follow these simple, usable rules when deciding which form to use:
- Default rule: use “different from” before a noun or noun phrase. Example: “Mandarin oranges are different from clementines.”
- Clause handling: when a full clause follows, “different than” is often shorter and less clunky. Example: “The result was different than I expected.”
- Rephrase to avoid the choice: convert the clause into a noun phrase so “from” works naturally. Example: “The result was different from what I expected” or “different from my expectation.”
- Both can be acceptable in everyday writing; prefer “from” for formality and “than” when it improves flow or readability.
Side-by-side examples:
- Preferred (formal): “Her approach is different from mine.” – Alternative (informal): “Her approach is different than mine.”
- Clause concise: “The test was different than I thought.” – Clause formal: “The test was different from what I thought.”
- Rephrase to avoid awkwardness: “Different from my expectation” instead of “different than what I expected.”
Style guides, regional usage, and authority
Traditional style manuals and many editorial authorities recommend “different from” as the default. For formal and academic writing, that guidance is safest.
Usage varies by region: American English increasingly accepts “different than” in informal contexts and before clauses; British English commonly uses “different to” and rarely “different than.” Published writing contains examples of all three, so consider audience and house style when choosing.
Common mistakes and how to fix them
These are frequent errors and simple corrections you can apply during editing.
- Mistake: “different as” – incorrect. Fix: use “different from” or “unlike.” Example: Instead of “He is different as his brother,” write “He is different from his brother.”
- Mistake: using “different than” in very formal prose where “from” reads better. Fix: switch to “different from” or rephrase. Example: “This study is different from previous ones.”
- Mistake: confusing exceptions. Use “other than” for exceptions, not “different from.” Example: “No one other than you can help.”
- Mistake: awkward clause with “from.” Fix: turn the clause into a noun phrase. Example: “The outcome was different from what I expected.”
Decision framework and copy-edit checklist
- Identify what follows “different”: noun phrase or full clause? If noun phrase → prefer “from”. If clause → consider “than” or rephrase.
- Assess audience and formality: default to “from” for academic, legal, or formal texts; allow “than” in conversational or tightly edited copy where it improves flow.
- Check regional and house-style preferences: use “different to” for UK-focused audiences if your style guide calls for it.
- If clarity is unclear, rephrase the sentence to a noun phrase or choose a different construction.
Quick proofreading checklist:
- Are usages consistent across the document?
- Would a following clause make “than” noticeably preferable for readability?
- Can the clause be converted into a noun phrase so “from” can be used?
- Does the choice match your style guide and audience expectations?
- Avoid “different as”; read sentences aloud to spot awkward phrasing.
Mini examples transformed with the checklist:
- Original: “The findings were different than I predicted.” → Formal: “The findings were different from what I predicted.”
- Original: “This method is different as previous ones.” → Fix: “This method is different from previous ones.”
- Original: “Her reaction was different than expected.” → Rephrased: “Her reaction differed from expectations.”
Conclusion
When in doubt, use “different from”-it’s the safest choice for formal and neutral writing. Use “different than” sparingly in informal contexts or when it makes a clause read naturally, and prefer rephrasing when either option would feel awkward.
Match your choice to audience, region, and house style, and keep usage consistent across a document to preserve clarity and tone.