Many English learners and even native speakers sometimes confuse less then and less than. The two phrases look and sound very similar, but they have different uses. If you are unsure which one to use in your writing, learning the simple difference can help you avoid common grammar mistakes and make your sentences clearer.
The correct phrase for making a comparison is less than. For example, you would write “The box weighs less than five pounds,” not “The box weighs less then five pounds.” The word than is used when comparing people, things, amounts, or measurements, while then usually refers to time, order, or what happens next.
In this guide, you will learn Less Then or Less Than – Which Is Correct? (Examples), along with clear examples of both words. We will explain the difference between then and than, show common mistakes, and provide practical tips to help you choose the correct word confidently in everyday and professional writing.
Quick Answer:
The correct phrase is less than.
The phrase less then is almost always a grammatical mistake because than is the word English uses to make comparisons. On the other hand, then relates to time, order, or what happens next.
Here’s a quick overview.
| Phrase | Correct? | Meaning |
| Less than | ✅ Yes | Used to compare amounts, numbers, time, distance, or quantity |
| Less then | ❌ No | Usually a spelling or typing mistake |
Examples
- We finished the project in less than a week.
- The laptop costs less than $800.
- There were less than twenty people at the meeting.
Incorrect examples:
- ❌ Less then five minutes.
- ❌ Less then expected.
- ❌ Less then ten dollars.
What Does “Less Than” Mean?
The phrase less than means a smaller amount, degree, number, value, or quantity compared with something else. Whenever you’re comparing two things and one has a lower value, less than is the correct choice.
You’ll find this phrase everywhere—from everyday conversations to academic writing, business reports, legal documents, and mathematics.
Common Uses of “Less Than”
People commonly use less than when discussing:
- Money
- Time
- Age
- Distance
- Weight
- Height
- Quantity
- Percentage
- Measurements
- Statistics
Examples
- The flight lasted less than two hours.
- My phone weighs less than 200 grams.
- We spent less than our monthly budget.
- The package arrived in less than three days.
- Only less than one percent of applicants were rejected.
Notice how every sentence compares one amount with another.
Why “Less Then” Is Incorrect
Many English learners—and even native speakers—mistakenly write less then because than and then sound similar.
The problem is simple.
The word then has nothing to do with comparisons.
Instead, then refers to:
- Time
- Sequence
- Order of events
- What happens next
Because of that, writing less then creates a grammatical error.
Incorrect vs. Correct Examples
| Incorrect | Correct |
| Less then ten minutes | Less than ten minutes |
| Less then $50 | Less than $50 |
| Less then expected | Less than expected |
| Less then half | Less than half |
| Less then one mile | Less than one mile |
A quick proofreading check can catch this mistake before you publish or submit your writing.
Understanding the Difference Between “Than” and “Then”
Learning the difference between these two words eliminates dozens of common grammar mistakes.
What Does “Than” Mean?
Than introduces a comparison.
Whenever you compare two people, places, things, numbers, or ideas, you need than.
Examples include:
- She is taller than her sister.
- This restaurant is cheaper than the other one.
- Today feels warmer than yesterday.
- The meeting ended earlier than expected.
- I have less money than last month.
Think of than as the word that compares.
What Does “Then” Mean?
Then refers to time or sequence.
It tells readers when something happened or what happens next.
Examples:
- Finish breakfast, then leave for work.
- We visited the museum, then went shopping.
- Back then, smartphones didn’t exist.
- Read the instructions first. Then begin the test.
If you can replace then with next, afterward, or at that time, you’re probably using it correctly.
Than vs. Then Comparison Table
| Than | Then |
| Used for comparisons | Used for time and sequence |
| More than | Then we left |
| Less than | Eat, then sleep |
| Rather than | Back then |
| Better than | Then it happened |
A simple way to remember the rule is this:
- Than = Compare
- Then = Time
How “Less Than” Appears in Everyday English
One reason this phrase matters is that people use it constantly.
At Work
Businesses compare budgets, profits, deadlines, and performance.
Examples:
- Sales increased by less than five percent.
- The repair cost less than expected.
- The project took less than six weeks.
At School
Teachers and students frequently compare grades, percentages, and assignments.
Examples:
- The essay contains less than 500 words.
- Less than half the class passed the quiz.
- The presentation lasted less than ten minutes.
In Shopping
Consumers compare prices every day.
Examples:
- This jacket costs less than $100.
- We found the same product for less than the original price.
- Shipping takes less than three days.
In Science
Scientists compare measurements and data regularly.
Examples include:
- Less than one milligram
- Less than five degrees
- Less than one percent error
Accuracy matters, which makes correct grammar equally important.
“Less Than” in Mathematics
The phrase less than also appears in mathematics.
Instead of writing the words every time, mathematicians use the symbol:
<
Examples:
| Expression | Meaning |
| 4 < 9 | Four is less than nine |
| 12 < 18 | Twelve is less than eighteen |
| x < 100 | x is less than one hundred |
Students often learn this symbol before fully understanding its grammar equivalent.
Real-Life Examples of “Less Than”
Let’s look at how native speakers naturally use the phrase.
Money
- The repair cost less than $200.
- We saved less than expected this month.
- The phone sells for less than $500.
Time
- The drive took less than an hour.
- She completed the test in less than thirty minutes.
- Dinner was ready in less than forty-five minutes.
Quantity
- Less than half the audience stayed until the end.
- There were less than twenty tickets available.
- Less than five employees were absent.
Age
- Children less than five years old enter free.
- The company is less than ten years old.
- The tree is less than a century old.
Distance
- The hotel is less than one mile away.
- The station is less than a ten-minute walk.
Common Grammar Mistakes Related to “Less Than”
Understanding related grammar rules helps you avoid several common errors.
Confusing “Than” and “Then”
This remains one of the most frequent spelling mistakes in English because both words sound similar.
Many spellcheck programs won’t catch the error since then is also a correctly spelled word.
That makes proofreading especially important.
Using “Less” Instead of “Fewer”
People also confuse less and fewer.
Here’s the traditional rule.
Use less with things you cannot easily count.
Examples:
- Less water
- Less traffic
- Less sugar
- Less information
Use fewer with countable items.
Examples:
- Fewer books
- Fewer cars
- Fewer students
- Fewer mistakes
Quick Comparison
| Less | Fewer |
| Less water | Fewer bottles |
| Less money | Fewer dollars (rare) |
| Less traffic | Fewer vehicles |
| Less time | Fewer hours (when emphasizing count) |
English does have exceptions.
For measurements, time, money, and distance, native speakers often prefer less than, even with numbers.
Examples:
- Less than ten miles
- Less than twenty dollars
- Less than five minutes
These expressions are completely standard.
Easy Tricks to Remember the Difference
Grammar doesn’t have to be difficult.
These memory tricks work well.
Think of Comparison
If you’re comparing two things, choose than.
Example:
- Less than
- More than
- Better than
Every comparison uses than.
Think of Time
If you’re talking about what happens next, use then.
Example:
- Eat dinner, then watch a movie.
Remember the Letter “A”
A useful memory aid is this:
ThAn = compArison
Both words contain the letter A.
Meanwhile:
ThEn = nExt
Both contain the letter E.
Many students remember this trick for years because it’s simple and practical.
Correct vs. Incorrect Examples
| Incorrect Sentence | Correct Sentence |
| Less then one hour | Less than one hour |
| Less then before | Less than before |
| Less then expected | Less than expected |
| Less then twenty people | Less than twenty people |
| Less then five dollars | Less than five dollars |
| Less then a minute | Less than a minute |
Reading these pairs helps train your eye to spot mistakes instantly.
Common Expressions That Use “Less Than”
Native speakers frequently use these phrases.
- Less than ideal
- Less than perfect
- Less than expected
- Less than average
- Less than half
- Less than one percent
- Less than a minute
- Less than likely
- Less than usual
- Less than nothing
Example Sentences
- The weather was less than ideal for hiking.
- Sales were less than expected this quarter.
- The repair took less than a minute.
- His performance was less than perfect, but he improved quickly.
You’ll hear these expressions in conversations, newspapers, television programs, and professional writing.
When Should You Use “Then”?
Although less then is incorrect, then itself is an important word.
Use it whenever you’re talking about sequence or time.
Examples:
- Finish your homework, then play outside.
- We ate lunch, then visited the park.
- Back then, streaming services didn’t exist.
- First save the document. Then print it.
- If you’re ready, then let’s begin.
Notice that none of these sentences compare two things.
Instead, they explain when something happens.
Read More: Indulgent vs. Sober: Deciding Between Similar Terms
A Practical Editing Case Study
Imagine you’re writing a business email.
Original sentence:
The meeting lasted less then thirty minutes.
Although the message is understandable, the grammar mistake can make your writing look less polished.
Correct version:
The meeting lasted less than thirty minutes.
This tiny correction improves accuracy and professionalism immediately.
The same principle applies to essays, blog posts, reports, emails, and social media content. One small word can make a noticeable difference.
“Good grammar isn’t about sounding formal. It’s about making your message clear and trustworthy.”
Conclusion:
The difference between less then and less than is simple once you understand how each word works. Less than is the correct phrase when you are making a comparison, such as comparing amounts, time, distance, age, or cost. Then is generally used to show time, order, or the next step. Remembering this basic rule can help you avoid common spelling and grammar mistakes.
When writing, pay attention to the meaning and context of your sentence rather than relying on how the words sound. If you are comparing two things, choose less than. With regular practice and careful proofreading, you can use the correct form confidently and make your writing clearer and more professional.
FAQs:
1. Is “less then” correct?
No. Less then is incorrect when you are making a comparison. The correct phrase is less than.
2. When should I use “less than”?
Use less than when comparing an amount, number, time, distance, age, price, or another measurable quantity. For example, “The journey took less than two hours.”
3. What is the difference between “then” and “than”?
Than is mainly used for comparisons, while then usually describes time, order, or sequence. For example, “She is younger than me” uses than, while “Finish your work, then leave” uses then.
4. Why do people confuse “less then” and “less than”?
People often confuse them because then and than look and sound similar, especially in casual speech. This can lead to accidental spelling and grammar mistakes.
5. How can I remember whether to use “then” or “than”?
A simple trick is to remember that than is connected with comparison. If your sentence compares two amounts, people, things, or measurements, than is usually the correct choice. Use then when talking about what happens next or when describing a sequence.
