Than vs. Then: The Difference, Examples, and a Quick Quiz

Use than to introduce a comparison. Use then for a time, a sequence, or the result in an if–then statement. The words differ by one letter, but they perform different grammatical jobs: than connects compared elements, while then usually acts as an adverb.

What Is the Difference Between Than and Then?

Than marks the second part of a comparison. It follows comparative words such as better, faster, older, more, and less.^[1][2]

• This route is shorter than the coastal road.
• Mina reads more quickly than I do.
• The repair cost less than we expected.
• I would rather walk than wait for another bus.

Then most often refers to a time or shows what happens next.^[1][3]

• I lived near the station back then.
• Read the instructions, then begin the test.
• We ate dinner and then watched a film.
• The office was closed by then.

Meaning or function	Correct word	Example
comparison	than	The blue box is heavier than the red one.
preference	than	I would rather revise than start again.
point in time	then	We did not know the answer then.
next event	then	Check the total, then submit the form.
conditional result	then	If the alarm sounds, then leave the building.

The quickest test is to identify the relationship. A comparison needs than. A time or next step needs then. Do not choose by sound alone.

Consider “The new model is quieter than the old model.” The sentence measures one model against another, so than is correct. In “We tested the old model, then ordered the new one,” the word describes sequence, so then is correct.

The distinction also explains why swapping the words changes or breaks the meaning:

• Incorrect: The train arrived later then expected.
• Correct: The train arrived later than expected.
• Incorrect: Finish the first section, than check your answers.
• Correct: Finish the first section, then check your answers.

In the first pair, later than expected compares the actual arrival time with the expected time. In the second pair, checking follows finishing.

How Do Than and Then Work in Tricky Sentences?

The same two tests still work in longer sentences: identify a comparison, or identify a time and sequence. A reference source gives both “younger than I am” and “taller than me” as comparison examples.^[1] It also uses then in “back then” and “until then” to refer to time.^[1]

• Kai is taller than me.
• Kai is taller than I am.

Both examples compare Kai’s height with another person’s height. That comparison is enough to choose than. You do not need a separate spelling rule for the pronoun that follows it.

Long comparisons may contain more than one verb. Find the two elements being compared before choosing the word.

• The revised guide is shorter than the original guide was.
• The final route took longer than we expected.
• Maya reads more quickly than her partner does.
• The blue sample is less flexible than the green sample.

Each sentence compares a quality, duration, speed, or degree. Replacing than with then would incorrectly turn that relationship into a time or sequence.

Time references may point backward or forward. Sequence references show which action follows another. In both cases, use then.

• The office used paper records back then.
• We can discuss the final figures before then.
• Measure the opening; then cut the panel.
• The alarm sounded, and then everyone left.

The first two examples identify a time. The final two order actions. None compares one person, object, amount, or action with another.

Some sentences contain comparison vocabulary and time vocabulary together. Classify the blank itself, not the whole sentence.

• The second draft was clearer than the draft we reviewed then.
• Prices were lower then than they are today.
• Finish sooner than yesterday’s team did; then record the time.
• The room felt warmer then than it had in the morning.

In each pair, than introduces compared elements. Then locates an event in time or moves the procedure to its next step. Reading the entire clause makes each role visible.

Use a substitution check when the sound is distracting. Substitute “compared with” for a comparison blank. Substitute “at that time” or “next” for a time or sequence blank. The substitute may make the sentence less elegant, but it should preserve the relationship.

• Lina arrived earlier than Omar. → Lina arrived earlier compared with Omar.
• The policy was different then. → The policy was different at that time.
• Read the prompt; then outline the answer. → Read the prompt; next outline the answer.
• This version costs less than that one. → This version costs less compared with that one.

The substitution is a diagnostic, not a rewrite for publication. Its purpose is to expose comparison, time, or order before you restore the correct word.

Editing becomes faster when each choice has a stated reason. Compare these corrections:

• Incorrect: The oak is taller then the fence. Correct: The oak is taller than the fence. The sentence compares heights.
• Incorrect: Save the file, than close the program. Correct: Save the file, then close the program. Closing follows saving.
• Incorrect: We had fewer orders then last week. Correct: We had fewer orders than last week. The sentence compares order counts.
• Incorrect: The road was quiet back than. Correct: The road was quiet back then. The phrase identifies a past time.
• Incorrect: Check the total; than send the invoice. Correct: Check the total; then send the invoice. Sending is the next action.
• Incorrect: Her explanation was more precise then mine. Correct: Her explanation was more precise than mine. The explanations are compared.

This method avoids guessing from pronunciation. It also explains the correction in terms that another editor can verify.

Can You Choose Than or Then in These Examples?

Complete each sentence with than or then. Identify comparison, time, sequence, exclusion, or result before checking the key.

1. The revised introduction is clearer _____ the original.
2. We reviewed the evidence and _____ updated the chart.
3. I would rather ask a question _____ guess.
4. If the figures agree, _____ publish the report.
5. The room seemed larger _____ it appeared in the photograph.
6. Other _____ two missing labels, the diagram was complete.
7. Life in the village was quieter back _____.
8. Finish the calculation; _____ check the units.
9. Priya arrived earlier _____ I did.
10. The _____ chairperson opened the archive in 1998.
11. The software uses less memory _____ the previous version.
12. We can discuss the final section after lunch; I will know more by _____.

Answer key

1. than — clearer establishes a comparison.
2. then — updating follows reviewing.
3. than — rather than compares two choices.
4. then — the word introduces the result of the condition. It may also be omitted.
5. than — the actual impression is compared with the photographic impression.
6. than — other than means “except for.”
7. then — the sentence points to a past time.
8. then — checking is the next action.
9. than — the sentence compares arrival times. The clause “than I did” makes the comparison explicit.
10. then — the then chairperson means the person holding that role at the time.
11. than — memory use is being compared.
12. then — the word refers to the future time after lunch.

Correct the word choice in each sentence:

1. The second explanation is more precise then the first.
2. Save the document, than close the program.
3. Other then the cover, the books are identical.
4. If the door is locked, than use the side entrance.

Corrections

1. The second explanation is more precise than the first. The sentence compares explanations.
2. Save the document, then close the program. The sentence gives a sequence.
3. Other than the cover, the books are identical. The phrase marks an exception.
4. If the door is locked, then use the side entrance. The word introduces the conditional result and could also be omitted.