Less Then or Less Than: Which Is Correct? Meaning, Rules & Examples

Have you ever paused while writing an email or assignment because you were unsure whether to use less then or less than? These expressions look almost identical, but one small spelling difference changes their grammatical function. The correct choice depends on what you want to communicate. In American English, less than is the standard phrase for comparing amounts, prices, time, measurements, or degrees. Then usually refers to time, order, or what happens next. Once you understand the difference between than and then, you can choose the right expression more confidently and avoid a common writing mistake.

Less Then or Less Than: Quick Answer

Less than is correct when you compare an amount, number, value, measurement, or degree with another amount or standard. For example, write “The package weighs less than five pounds.” Less then is incorrect when used to make this comparison. Use then when referring to time, sequence, or a subsequent action.

Key Takeaways

• Less than is the correct expression for comparisons.
• Than connects comparative expressions, such as less than, more than, and faster than.
• Then usually refers to time, sequence, or a result.
• Write “The meeting lasted less than an hour,” not “The meeting lasted less then an hour.”
• Less then can appear when less and then perform separate grammatical jobs, but it is not the standard phrase for comparison.
• Use fewer than when you want to emphasize a count of separate items, while recognizing that less than is also common with measurements, money, and periods of time.

What Is the Difference Between Less Then and Less Than?

The difference comes down to the meanings of than and then. The word than introduces a comparison, while then commonly indicates when something happened or what happened next.

The Cambridge Dictionary defines than as a word used to connect parts of a comparison. It gives examples involving amounts and comparative statements. The word then, by contrast, commonly describes time or sequence. These functions explain why the two words cannot be freely substituted. Cambridge Dictionary: Than

What Does Less Than Mean?

Less than means a smaller amount, quantity, value, or degree than another amount or reference point. It often appears before numbers, prices, durations, measurements, and comparative expressions.

Examples:

• The book costs less than $20.
• The drive took less than two hours.
• The package weighs less than ten pounds.
• Her final score was less than mine.
• The results were less than satisfactory.

In each sentence, than introduces the value or standard used for comparison.

The expression also appears in the phrase less than ideal, which means that something is not as good as desired.

For example:

“The hotel room was less than ideal.”

This sentence suggests that the room did not meet expectations. It does not necessarily compare two specific hotel rooms.

What Does Less Then Mean?

Less then is not the standard expression for making a comparison. In a sentence such as “The ticket costs less then $50,” the word then is incorrect because the sentence compares a price with $50.

Correct:
“The ticket costs less than $50.”

Incorrect:
“The ticket costs less then $50.”

However, the words less and then can occasionally appear next to each other when they serve separate purposes.

For example:

“We had less food then because the shops were closed.”

Here, less describes the amount of food, while then refers to a particular time in the past. The sentence is possible, although a clearer version would be:

“We had less food at that time because the shops were closed.”

This distinction matters because the problem is not that the words can never appear next to each other. The problem is using then instead of than to express a comparison.

When Should You Use Than Instead of Then?

Use than when the sentence compares two things or measures one thing against a reference point. Use then when the sentence describes time, order, or a subsequent event.

1. Use Than for Comparisons

The word than commonly follows comparative expressions such as less, more, better, faster, older, and cheaper.

Examples:

• This phone costs less than the other model.
• She runs faster than I do.
• The new office is closer than the old one.
• The movie was shorter than we expected.
• We spent less than our original budget.

The word than introduces the second part of each comparison.

A simple test is to ask: Am I comparing one thing with another? If the answer is yes, than is likely the correct choice.

2. Use Then for Time or Sequence

The word then usually tells readers when something happened, what happened next, or what follows from a condition.

Examples:

• We ate dinner and then watched a movie.
• Finish the assignment, then submit it.
• Back then, I lived in another state.
• If the weather improves, then we can go outside.
• First, open the file. Then, check the spelling.

In these sentences, then does not introduce a comparison. It helps organize events or ideas.

3. Compare the Two Words Side by Side

Remember that than and then are different words with different grammatical functions. Their similar spelling does not make them interchangeable.

How to Use Less Than in Everyday Situations

The phrase less than works in many everyday contexts. The important thing is to make sure the sentence compares an amount or degree with another amount or standard.

Money and Prices

Use less than when describing a price below a specific amount.

Examples:

• I bought the shirt for less than $25.
• The repair cost less than the estimate.
• We need to keep the expense below $500.
• The monthly fee is less than I expected.

Practical example: Imagine you are comparing two internet plans. Plan A costs $45 per month, while Plan B costs $60. You could write, “Plan A costs $15 less than Plan B each month.”

The comparison is clear because than introduces the second plan.

Time and Duration

Use less than to compare a period of time with a specified duration.

Examples:

• The meeting lasted less than thirty minutes.
• We finished the project in less than a week.
• The package arrived in less than two days.
• The flight took less than three hours.

Practical example: If a task takes 40 minutes and your target is one hour, you could say, “I completed the task in less than an hour.”

Do not write “I completed the task in less then an hour.” The sentence compares the duration with one hour, so than is required.

Distance and Measurements

The phrase also works with distances, weights, lengths, temperatures expressed as values, and other measurements when the comparison is appropriate.

Examples:

• The store is less than a mile away.
• The suitcase weighs less than 20 pounds.
• The board is less than six feet long.
• The container holds less than one gallon.

These examples show how less than helps communicate a measurement below a stated limit.

Numbers and Quantities

Use less than with quantities or values when that is the natural expression.

Examples:

• The answer is less than 100.
• The temperature stayed below the expected level.
• The project took less than five days.
• The final amount was less than the original estimate.

When counting separate people or objects, fewer than may be more appropriate. The distinction is explained in the next section.

Should You Use Less Than or Fewer Than?

Both expressions can be correct, but they do not always fit the same nouns. Traditional grammar guidance generally uses less for amounts and uncountable nouns and fewer for countable plural nouns.

The Cambridge Dictionary explains that less commonly refers to quantities and degrees, while fewer is generally used for countable plural nouns. Cambridge Dictionary: Less and Fewer

Why Is Less Than Ten People Sometimes Questioned?

Traditional formal grammar usually recommends fewer than ten people because people can be counted individually. However, less than also appears naturally in some contexts where a group or number is treated as a measured amount.

Merriam-Webster notes that the distinction is not absolute and recognizes established uses such as less than $20, less than three miles, and certain expressions involving counted amounts. Merriam-Webster: Fewer vs. Less

For formal writing, a useful approach is to choose fewer than when counting separate items and less than when discussing amounts, time, money, distance, or degree.

Most importantly, this is a separate question from than versus then. Both less than and fewer than use than to introduce a comparison.

Common Mistakes With Less Than and Less Then

Most errors happen when writers select then because it looks or sounds similar to than. Other mistakes involve sentence structure or confusion about less and fewer.

Why Do People Confuse Than and Then?

There are several possible reasons:

• Similar spelling: The words differ by only one letter.
• Similar pronunciation: In some accents and unstressed positions, their vowel sounds can be similar.
• Fast typing: Writers may choose the wrong word without noticing.
• Autocorrect: A typing tool may not identify every error when the result is a valid word.
• Unclear sentence structure: Writers may focus on the individual words instead of the relationship between ideas.

The best correction method is to examine the meaning of the entire sentence rather than relying only on how the phrase sounds.

A Simple Three-Step Method to Choose the Right Word

Use this process whenever you hesitate between than and then.

Step 1: Identify the purpose of the sentence.

Ask whether you are comparing two amounts, values, people, or qualities. If you are, you probably need than.

Step 2: Check whether the sentence describes a sequence.

If you are explaining what happened next or referring to a past time, then may be correct.

Step 3: Read the sentence with the intended meaning in mind.

Check that the chosen word connects the ideas correctly.

Consider these examples:

• “The drive took less than an hour.” The sentence compares the duration with one hour, so use than.
• “We drove to the store, then returned home.” The sentence describes a sequence, so use then.

Quick Memory Trick

Remember these two formulas:

Comparison = than

Time or sequence = then

For example, “This costs less than that” is a comparison. “Buy this, then go home” describes the order of actions.

This method is not a replacement for understanding the sentence, but it is a useful proofreading shortcut.

Practice Exercise: Than or Then?

Choose the correct word in each sentence.

1. The meeting lasted less ___ an hour.
2. We finished lunch and ___ went back to work.
3. This laptop costs less ___ $700.
4. Back ___, I worked in a small office.
5. The new route is shorter ___ the old one.
6. Read the instructions first, ___ start the program.
7. The package weighs less ___ five pounds.
8. She is more experienced ___ her colleague.

Answers and Explanations

1. Than — It compares the meeting’s duration with one hour.
2. Then — It describes the next action.
3. Than — It compares the price with $700.
4. Then — The expression back then refers to a time in the past.
5. Than — It compares the lengths of two routes.
6. Then — It shows the order of actions.
7. Than — It compares the package’s weight with five pounds.
8. Than — It compares two people’s experience.

If you missed any answers, review the sentence’s purpose. Is it making a comparison, or is it describing time or sequence?

Frequently Asked Questions

1. Is it less then or less than?

Less than is correct when comparing amounts, numbers, values, measurements, or degrees. For example, “The ticket costs less than $40.” Less then is incorrect for this comparison because then refers to time, sequence, or a result rather than introducing the comparison.

2. Is less then ever grammatically correct?

The words less and then can appear next to each other when they serve separate purposes. For example, “We had less food then because the stores were closed” uses less for quantity and then for a past time. However, use less than whenever you intend to make a comparison.

3. What is the difference between than and then?

Than introduces a comparison, as in “This route is shorter than the other one.” Then commonly refers to time or sequence, as in “We finished dinner and then left.” The words look similar, but they perform different grammatical jobs and cannot be freely substituted.

4. What does less than mean?

Less than means a smaller amount, lower value, or reduced degree compared with another amount or standard. It appears in sentences about money, time, distance, weight, and other measurements. For example, “The journey took less than two hours” means the journey lasted under two hours.

5. Should I use less than or fewer than?

Use fewer than when counting separate items, such as people, books, or cars. Use less than for amounts, time, money, distance, and degree. For example, “Fewer than ten students attended,” but “The class lasted less than an hour.” Actual usage varies by context, so consider the noun and the sentence.

6. Is less than an hour correct?

Yes. Less than an hour is a standard expression because it compares a duration with one hour. For example, “The meeting ended in less than an hour.” Do not write less then an hour when you mean that the meeting lasted under sixty minutes.

7. Why do people confuse than and then?

People may confuse the words because their spelling is similar and their pronunciation can sound similar in casual speech. Fast typing and reliance on autocorrect can also contribute. Checking the sentence’s meaning is more reliable than choosing the word based only on sound.

8. How can I remember when to use than or then?

Use than for comparisons and then for time or sequence. Ask yourself what the sentence is doing. If you are comparing a price, duration, measurement, or quality, use than. If you are describing what happened next or referring to a time, use then.

Conclusion: Always Use Less Than for Comparisons

When choosing between less then or less than, use less than to compare amounts, prices, time, distances, measurements, and degrees. Use then when referring to time, sequence, or what happens next. The words are similar in appearance, but their grammatical functions are different.

Before submitting an email, school assignment, business document, or website article, read the complete sentence and identify its purpose. If it makes a comparison, choose than. If it describes a sequence or time, choose then. This simple habit can help you avoid a common grammar mistake and write more clearly.