Then and than look nearly identical, sound similar in rapid speech, and are among the most frequently confused word pairs in English. The difference, however, is straightforward once you understand the rule: then relates to time or sequence; than is for comparisons.
Why We Mix Them Up
Blame your ears. In casual conversation, both words get reduced to a quick "th'n" — the vowel almost disappears. "I'll see you then" and "Better than ever" come out sounding nearly identical when spoken fast. Add autocorrect to the mix (which often "fixes" the wrong one), and even careful writers end up with errors. Native speakers and English learners both trip on this pair, but for slightly different reasons: native speakers rely on sound and get sloppy, while ESL learners often never learned the distinction explicitly.
The One-Rule Summary
Then = time or sequence (what happens next). Than = comparison (comparing two things). If you can replace the word with "next" or "at that time," use then. If you can replace it with "compared to," use than.
Then: Time, Sequence, and Consequence
Sequence of events: "We reviewed the contract, then we signed it." Then marks what happened next.
Specific time reference: "I was younger then." "Back then, we didn't have smartphones." Then refers to a time already mentioned or understood.
Conditional consequence (if/then): "If you finish early, then we can grab dinner." Then introduces the result of a condition.
Addition or emphasis: "The rent, and then the utilities on top of that..." Then adds another item, often with frustration or emphasis.
Than: Comparisons Only
Comparative adjectives: "She's taller than her brother." "This route is faster than the highway." Than always follows a comparative form (taller, faster, better, more, less).
"Rather than" and "other than": "I'd rather walk than take the bus." "No one other than the manager can approve this." These fixed phrases always use than.
"More than" / "Less than": "It costs more than I expected." "The meeting lasted less than an hour." These quantity comparisons always use than.
Common Mistakes and Corrections
Wrong: I'm taller then you.
Right: I'm taller than you. (Comparison — use than.)
Wrong: First we eat, than we leave.
Right: First we eat, then we leave. (Sequence — use then.)
Wrong: It was more expensive then I thought.
Right: It was more expensive than I thought. (Comparison — use than.)
Wrong: Back than, things were different.
Right: Back then, things were different. (Time reference — use then.)
Memory Tricks That Work
Trick 1: The "E" and "A" Mnemonic. Then = Time. Both have an "e." Than = Comparison. Both have an "a." This is the simplest, most reliable trick.
Trick 2: The Alphabet Test. In the alphabet, "e" comes before "a." In a sequence of events, then (with "e") comes before than (with "a") — first something happens, then you compare it.
Trick 3: The Replacement Test. Read the sentence aloud. Replace the word with "next" — if the sentence still makes sense, use then. Replace with "compared to" — if it still works, use than. The replacement that sounds natural tells you which spelling to use.
Quick Self-Test
Fill in the blank with then or than. Answers at the bottom — no peeking.
- Mix the dry ingredients first, ___ add the eggs.
- This laptop is faster ___ my old one.
- Back ___, nobody owned a smartphone.
- If the bus is late, ___ we'll take a taxi.
- I'd rather cook at home ___ eat out tonight.
Answers: 1. then (sequence) 2. than (comparison) 3. then (past time) 4. then (conditional result) 5. than (preference, "rather than")
Then as a Noun and Adjective (The Tricky Cases)
Most guides stop at "then = time, than = comparison." But then pulls double duty in ways that can confuse even confident writers:
Then as a noun: "Since then, everything changed." Here, then means "that time" — it's a noun, the object of the preposition "since." You'll see this in phrases like "until then," "by then," and "before then."
Then as an adjective: "The then president signed the order." Then modifies "president" to mean "the president at that time." This usage is common in news and formal writing. If you can replace it with "at that time" and it still works, then is correct.
Tips for ESL Learners
If English isn't your first language, the then/than distinction can be especially tricky because many languages use a single word for both concepts. Spanish uses "entonces" for then and "que" for than — they don't sound alike at all, so the English confusion doesn't translate. Mandarin speakers may not have a direct parallel for either word. The best approach: memorize the comparison trigger. Every time you see a comparative form (more, less, -er ending, rather, other), the next word is than. No comparative = probably then.
Then/Than in Formal Writing
In academic and professional writing, then/than errors are considered basic mistakes that undermine credibility. A 2023 Grammarly analysis of 50 million documents found then/than confusion was the 8th most common writing error among native English speakers. Proofreading specifically for this pair — scanning your draft and checking every instance of then and than — catches 95% of these errors before anyone else sees them.
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