Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
less than one
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "less than one" is correct and usable in written English.
It can be used to describe a quantity that is smaller than one, often in mathematical or statistical contexts. Example: "The survey results indicated that less than one in five participants preferred option A over option B."
✓ Grammatically correct
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
55 human-written examples
On average, survival is less than one year [ 5].
"That's less than one second.
News & Media
Even less than one second.
News & Media
Here's a clue: it's less than one.
News & Media
"Now it's less than one a day".
News & Media
Less than one percent wears the uniform.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
5 human-written examples
Less than one-third will be claimed.
News & Media
Today, less than one-fifth do.
News & Media
That is less than one-twelfth of the Quran.
News & Media
That's less than one-third of the golden ticket pool.
News & Media
Less than one-sixth of the students (13.2%) reported working.
Science
Expert writing Tips
Best practice
When using "less than one" to describe proportions or percentages, ensure the context is clear. For example, "less than one percent" is more precise than simply saying "less than one" when referring to a small percentage.
Common error
Avoid using "less than one" when you actually mean 'close to one'. For instance, if a value is 0.9, it's technically "less than one", but it's more accurate to say 'almost one' or 'close to one' to avoid misleading the reader.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "less than one" primarily functions as a quantifier, indicating that a value or quantity is smaller than the numerical value of one. Ludwig examples demonstrate its use in a variety of contexts, from scientific measurements to statistical probabilities.
Frequent in
News & Media
37%
Science
58%
Formal & Business
2%
Less common in
Encyclopedias
1%
Reference
1%
Wiki
1%
Ludwig's WRAP-UP
In summary, the phrase "less than one" is a grammatically correct and very common expression used to indicate a quantity or value smaller than one. As confirmed by Ludwig AI, it appears frequently in news, scientific, and formal contexts. When employing the phrase, ensure that it precisely reflects the intended meaning, especially when describing small quantities or proportions. For more precise expressions, consider alternatives like "smaller than one" or "below unity". Always ensure the scale and context are clear to avoid ambiguity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
smaller than one
Directly states the size comparison, suitable for various contexts where size or quantity is relevant.
under one
A more casual way of saying "less than one", appropriate for less formal settings.
less than unity
Similar to 'below unity', this phrase is often found in mathematical or scientific discourse.
below unity
Emphasizes the mathematical concept of being less than the number one, often used in technical contexts.
a fraction of one
Highlights that the quantity is only a part of a whole, specifically less than one unit.
not even one
Emphasizes the absence of a full unit, stressing how little there is.
a negligible amount
Highlights that the quantity is so small that it can be disregarded without significant impact.
approaching zero
Indicates that the value is very close to zero, implying it's significantly less than one.
virtually zero
Suggests that the quantity is so small that it's practically nonexistent.
close to nothing
Expresses that the value is insignificant and barely measurable.
FAQs
How can I use "less than one" in a sentence?
The phrase "less than one" is used to indicate a quantity or value that is smaller than one. For example, "The probability of that event occurring is "less than one" percent".
What's a more formal way to say "less than one"?
In formal contexts, consider using phrases such as "below unity" or "smaller than unity" to convey a similar meaning with increased precision.
Is it ever incorrect to use "less than one"?
While grammatically correct, using "less than one" can be misleading if a more precise term exists. For instance, instead of saying ""less than one"", you might say "almost zero" if the value is very small.
What's the difference between "less than one" and "fewer than one"?
The phrase ""less than one"" is generally used for uncountable nouns or quantities, while "fewer than one" is rarely used as it is grammatically incorrect to use 'fewer' with values that can be fractions. Stick to 'less' in such cases.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested