do you have to write out numbers in an essay

When to Spell Out Numbers in Writing: Guide and Examples

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The Rules for Writing Numbers in English 

You may have noticed a theme when it comes to the English language: most rules are not standardized. This (somewhat frustrating) fact is especially true when it comes to spelling out numbers. Should you write them out in words or leave them as numerals? To write numbers properly, you will also need to identify potential differences between major style guides (such as MLA , APA , and Chicago , to name a few) because these guides often outline different rules for using numbers in writing.

To make it easier, let's use an example. Say you're working on a paper evaluating the importance of the local public library in your community. The document will make use of small numbers, large numbers, decades, and statistics. Each type of number may follow a different rule.

Thankfully, when using numbers in writing, you can count on a few conventions that apply to most situations; just be sure to consult your specific style guide if one has been assigned. If you don't have time to review each number yourself, a professional editor or proofreader can ensure that your numbers are written correctly.

Writing Small and Large Numbers

A simple rule for using numbers in writing is that small numbers ranging from one to ten (or one to nine, depending on the style guide) should generally be spelled out. Larger numbers (i.e., above ten) are written as numerals.

For example, instead of writing "It cost ten-thousand four-hundred and sixteen dollars to renovate the local library," you would write, "It cost $10,416 to renovate the local library."

The reason for this is relatively intuitive. Writing out large numbers not only wastes space but could also be a major distraction to your readers.

Beginning a Sentence with a Number

Here is a rule that you can truly rely on: always spell out numbers when they begin a sentence, no matter how large or small they may be.

Incorrect: 15 new fiction novels were on display.

Correct: Fifteen new fiction novels were on display.

If the number is large and you want to avoid writing it all out, rearrange the sentence so that the number no longer comes first.

Revised: There were 15 new fiction novels on display.

Whole Numbers vs. Decimals

Another important factor to consider is whether you are working with a whole number or a decimal. Decimals are always written as numerals for clarity and accuracy.

To revisit our library example, perhaps circulation statistics improved in 2015. If a number falls in the range of one to ten and is not a whole number, it should be written as a numeral.

Incorrect: The circulation of library materials increased by four point five percent in 2015.

Correct: The circulation of library materials increased by 4.5% in 2015.

Paired Numbers (Two Numbers in a Row)

When two numbers come next to each other in a sentence, be sure to spell out one of these numbers. The main purpose of this rule is to avoid confusing the reader.

Incorrect: There were 12 4-year-old children waiting for the librarian to begin story time.

Correct: There were 12 four-year-old children waiting for the librarian to begin story time.

Correct: There were twelve 4-year-old children waiting for the librarian to begin story time.

Decades and Centuries

Decades or centuries are usually spelled out, especially if the writing is formal.

Incorrect: The library was built in the '50s.

Correct: The library was built in the fifties.

If you are referring to a specific year (e.g., 1955), use the numeral.

Consistency Is Key When Using Numbers in Your Writing

Always strive for consistency, even if it overrides a previous rule. For example, if your document uses numbers frequently, it is more appropriate for all numbers to remain as numerals to ensure that usage is uniform throughout. Similarly, if a single sentence combines small and large numbers, make sure that all the numbers are either spelled out or written as numerals.

Incorrect: The library acquired five new mystery novels, 12 new desktop computers, and 17 new periodicals.

Correct: The library acquired 5 new mystery novels, 12 new desktop computers, and 17 new periodicals.

Style Guides May Have Slightly Different Rules for Writing Numbers in Words

Let's complicate things a bit, shall we?

If your work must follow the rules of a specific style guide, understand that various guides all have rules for spelling out numbers that may differ slightly from the rules listed above. For example, MLA style indicates that writers may spell out numbers if they are not used too frequently in the document and can be represented with one or two words (e.g., twenty-four, one hundred, three thousand ). APA style advises that common fractions (e.g., two-thirds ) be expressed as words. A number of specific rules for spelling out numbers are outlined in Section 9.1 of the Chicago Manual of Style.

Your ultimate authority will always be a style guide, but in the absence of one, following the rules outlined above will help you stay consistent in your use of numbers in writing.

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In an essay, when do you spell out numbers and when do you use numerals?

According to APA Style, you should normally use numerals for the numbers 10 and above. You should use words to express numbers below 10 (one, two, three, four, five, six, seven, eight, and nine).

Note, however, that APA lists a wide variety of exceptions. For instance, numbers that appear right before a unit of measurement should be expressed as numerals, regardless of where they fall, before or after 10. Example: Give him 5 cups of soup.

The APA also addresses this question directly in this webpage .

The sections in APA that address numbers are 6.32-6.39 in the 7th edition of the Publication Manual.

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Rules for Writing out Numbers

Reviewing the Rules

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• B.A., History, Armstrong State University

Why do so many people find it difficult to remember the rules for using numbers in formal writing ? Probably because the rules seem a little fuzzy sometimes.

So what can you do? It's no mystery: as with anything, read and study the rules several times, and it will all seem natural, eventually.

Writing Numbers One through Ten

Spell out numbers one through ten, as in this example:

• My little brother ate four apples before dinner and became ill.
• Why do parents always check to see if babies have ten toes?

Writing Numbers Above Ten

Spell out numbers above ten, unless writing the number would involve using more than two words. For example:

• I have sixty-three dead bugs in my collection.
• My cousin has 207 bugs in his.
• This site has given me a thousand helpful hints for my homework.
• My grandmother is seventy-two today.
• My little sister had about 4,763 measles on her face.

Always Spell Out Numbers that Begin Sentences

It would look odd to begin a sentence with a numeral.

• Four hundred fifty people attended the birthday party.

However, you should try to avoid using long, clunky numbers at the beginning of a sentence. Instead of writing that four hundred and fifty people attended a party, you could re-write:

• There were 450 people at the party.

Dates, Phone Numbers, and Time

Use numbers for dates:

• My birthday is on March 16.
• He was born on Valentines Day, 1975.

And use numbers for phone numbers:

• The phone number for the school is 800-555-6262
• The international code for England is 44.

And use numbers for telling time if using a.m. or p.m.:

• The alarm will sound at 7 p.m.
• I make my bed at 7 a.m. each morning.

But spell out times when using "o'clock" or when the a.m. or p.m. are omitted:

• The alarm will sound at seven o'clock.
• I make my bed at seven each morning.
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Writing numbers When to use words and when to use numerals

It can be difficult to know how to write numbers in academic writing (e.g. five or 5 , 1 million or 1,000,000 ). This section gives some guidelines on when to use words to write numbers, and when to use numerals . There are also some exceptions to the rule which are considered, i.e. times when you might expect to use words but should instead use numerals. There is also a checklist at the end, that you can use to check the use of numbers in your own writing.

When to use words

In general, words should be used for zero to ten , and numerals used from 11 onwards. The same rule should be applied to ordinal numbers, i.e. use words for first, second up to tenth, and numbers plus 'th' (or 'st') from 11th onwards. However, it is always best to check what the accepted practice is at your university (or in your department/on your course), and remember that some common referencing systems have their own, different requirements, as follows.

• MLA . Use words if the number can be written using one or two words (e.g. three , twenty-seven ).
• APA . Use words for numbers zero to nine.
• Chicago . Use words for numbers zero to one hundred.

Before looking at when to use numerals (which is almost all other situations, see next), it is useful to look at important exceptions.

(1) When the number begins a sentence , you should use words , whatever the size of the number (though if possible, rewrite the sentence so the number is not at the beginning).

• Fifty respondents agreed with the statement.
• There were 50 respondents who agreed with the statement. [ rewritten sentence ]
• 50 respondents agreed with the statement.

(2) When expressing part of a very large round number , e.g. million, billion, you should use words for that large number part (it is common to use abbreviations m for million and bn billion ).

• The population of the earth is now in excess of 7 billion people.
• The population of the earth is now in excess of 7bn people.
• The population of the earth is now in excess of 7,000,000,000 people.
• The population of the UK is approximately 70 million.
• The population of the UK is approximately 70,000,000.

Conversely, numerals should be used rather than words, whatever the size of the number, when large and small numbers are combined , since this makes comparisons easier.

• There were 2 respondents in the first category, and 22 in the second.
• There were two respondents in the first category, and 22 in the second.

When to use numerals

Numerals are used for almost all other situations. These include the following.

• Measurements (e.g. 6 kg, 3 cm, 10 min, 2 hr, 3 days, 6 years, 5 decades )
• Currency (e.g. $10, £50, £60 billion )
• Statistical data , including survey data (e.g. A survey of participants revealed that 4 out of 5 students worked. )
• Mathematical functions (e.g. v 2 = u 2 + 2as )
• Decimals (e.g. 2.5, 4.54 )
• Percentages (e.g. 75% )
• Ratios (e.g. 3:1 )
• Percentiles/quartiles (e.g. the 95th percentile, the 1st quartile )
• Times (e.g. 12.30 a.m., 6 p.m., 16:00 )
• Dates (e.g. Wednesday 25 December 2019 )
• Scores/points on a scale (e.g. This item scored 5 on a 9-point scale )

Other important points

The following are a few other points to remember when using numbers.

• Consistency. You should be consistent in how you write numbers; for example, if write a figure like 7bn in one place, do not write a figure like 5 billion in another.
• Use of commas. When giving numerals of 1,000 or larger, use commas for each thousand, e.g. 5,500, 8,326,500 .
• Use of hyphens. When displaying a range, use a hyphen, with no space, e.g. 30%–50%
• Expressing fractions. Fractions can be written either as numerals e.g. 2/3 or words e.g. two-thirds . If using words, use a hyphen.

American Psychological Association (2019a) Numbers Expressed in Words . Available at: https://apastyle.apa.org/style-grammar-guidelines/numbers/words (Accessed: 26 December, 2019).

American Psychological Association (2019b) Numbers Expressed in Numerals . Available at: https://apastyle.apa.org/style-grammar-guidelines/numbers/numerals (Accessed: 26 December, 2019).

Harvard Wiki (2019) Numbers . Available at: https://wiki.harvard.edu/confluence/display/HSG/Numbers . (Accessed: 26 December, 2019).

University of Bristol (2015) Using numbers . Available at: http://www.bristol.ac.uk/arts/exercises/grammar/grammar_tutorial/page_33.htm (Accessed: 26 December, 2019).

University of New England (nd) Numbers in academic writing . Available at: https://aso-resources.une.edu.au/academic-writing/miscellaneous/numbers/ (Accessed: 26 December, 2019).

University of Oxford (2015) Style Guide . Available at: https://www.ox.ac.uk/sites/files/oxford/media_wysiwyg/University%20of%20Oxford%20Style%20Guide.pdf (Accessed: 26 December, 2019).

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Below is a checklist for using numbers in academic writing. Use it to check your writing, or as a peer to help.

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Author: Sheldon Smith    ‖    Last modified: 16 January 2022.

Sheldon Smith is the founder and editor of EAPFoundation.com. He has been teaching English for Academic Purposes since 2004. Find out more about him in the about section and connect with him on Twitter , Facebook and LinkedIn .

Compare & contrast essays examine the similarities of two or more objects, and the differences.

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Transition signals are useful in achieving good cohesion and coherence in your writing.

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MLA Style Guide

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• Using Numbers

Using Numbers in an Essay

Spell out numbers that can be expressed in either one or two words.  

•   one million
•   ninety-nine
•   one hundred
•   fifteen hundred

Always spell out the number if a sentence begins with a number.

Example: Two thousand twelve was an election year in the United States.

When Should I Use Numerals?

Use numerals if you are writing an essay about a scientific subject or an essay that includes frequent use of numbers, like statistical findings. 

Always use numerals:

•  in front of units of measurements. Example : 5 millimeters
•  with abbreviations such as 6 lbs., 4:20 p.m., $9, 2”, 4%.
•  in dates: Example: April 1, 2014
•  in decimal fractions: Example: 9.2

Exceptions:  

• For large numbers, you may use a combination of numerals and words. Example: 4.5 million
• In general use numerals with % signs, however, you may spell out percentages or amounts of money if you can do so in three words or less. Example: five dollars, forty-five percent, sixty-eight cents.
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A Quick Guide to Numbers in MLA Style

• Nov 05, 2020
• Academic Editing
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• Referencing and Citations

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Your client might not know all the details of MLA style. As an academic proofreader, then, your work may involve checking that documents follow MLA conventions. Thus, in this post, we’re looking at how to present numbers in academic writing according to MLA style.

Numbers in MLA: Numerals or Words?

MLA style sets out two approaches to numbers. In writing that involves few numbers , the MLA Handbook advises spelling out numbers that can be written as one or two words:

o ne, thirty-six, ninety-nine, one hundred, three million

It also says that plurals of spelled-out numbers should be treated as nouns:

fives, thirties

Other numbers, however, should be presented as numerals:

5¾, 305, 643, 2,798

For writing that uses numbers frequently , meanwhile, the MLA advises:

• Using numerals with units of measurement (e.g., 55 inches , 800 grams ) and other numbers presented alongside them (e.g., comparisons or reports of experimental data).
• Expressing larger numbers as a mix of numerals and words (e.g., 7 million , 1.4 billion ).
• Other numbers should be spelled out if they can be written as one or two words.

In both approaches, the MLA also advises using numerals for:

• Numbers used with abbreviations or symbols (e.g., 8lbs. , 6:00am , $7.90 ).
• Addresses (e.g., 635 New Street , 81 5 th Street ).
• Items in a numbered series (e.g., Year 5 , chapter 3 , volume 4 ).
• Dates (e.g., September 10, 2020 , August 5, 1996 ).
• Decimal fractions (e.g., 5.6 , 3.142 ).

In addition, in both styles, numbers should be spelled out at the start of a sentence (or the sentence should be rephrased to avoid starting with a number). When proofreading, then, make sure the guidelines above are applied consistently according to the document type.

Commas in Numbers

MLA style recommends placing a comma after every third digit in large numbers. For example:

However, commas are not used in page and line numbers , addresses , or four-digit years .

Page Ranges in MLA Style

For a range of page numbers in a citation or the Works Cited list, the MLA says to write the second value in the range in full for numbers up to 99. For example:

For larger numbers, though, only the last two digits of the second number should be given. The exception is when more are necessary for clarity:

The rules for years are a little different. If a range of years begins AD 1000 or later, MLA says to omit the first two digits of the second year if they are the same as the first two digits of the first year. Otherwise, though, you should make sure both years are written in full:

If the years discussed fall between AD 1 and 999, though, follow the general rules for inclusive numbers. And make sure ranges of years that begin before AD 1 are written in full.

Punctuating Number Ranges

In published work, MLA follows the convention of using an en dash for number ranges:

She spent her most productive period (1907 –1912) in Amsterdam.

However, for simplicity, MLA also permits a hyphen for number ranges in student writing:

She spent her most productive period (1907- 1912) in Amsterdam.

If you’re proofreading student work, then, there is no need to replace hyphens in number ranges. You can simply check that ranges are punctuated consistently.

Roman Numerals

Finally, the MLA Handbook also has a few rules for using Roman numerals :

• Capitalized Roman numerals are used for the primary divisions in an essay or book outline and as suffixes for the names of persons (e.g., Part I , Henry VII ).
• Lowercase Roman numerals are only used when citing pages that are so numbered (e.g., in the preface or introduction of a book), with ranges written out in full (e.g., xxv –xxviii , iv –xii ).

If you see Roman numerals in a document, make sure they follow these conventions.

Becoming A Proofreader

Here, we’ve seen what to look out for when proofreading numbers in a document that uses MLA style. But you can learn all about style guides, formatting, and proofreading in general with our Becoming A Proofreader course! Sign up for a free trial today to find out more.

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How to Write Out Numbers in MLA Format

The Modern Language Association established their documentation format in order to create consistency among papers and publications focused on language and literature. Following those standards throughout your paper not only with citations, but also for other elements of format such as the use of numbers, constructs an easy-to-read document that shows your attention to detail.

According to the MLA Handbook for Writers of Research Papers (Seventh edition), for most MLA style papers, spell out numbers written in one or two words such as "two" or "three hundred." If you begin a sentence with a number, spell it out, even if it is a date or other number that uses more than two words. When using large numbers, as long as they do not start the sentence, you can use a combination of numerals and words, such as "3.6 billion." Write out spans of time such as "sixteenth century."

Use numerals for large numbers that do not allow for a smooth combination of numbers and words, such as "151." In papers that rely heavily on numbers, focusing on mathematical or scientific concepts or containing many statistics, use numerals before measurement terms, such as "3 centimeters" and data comparisons such as "the scores rose from 7 to 12." Use numbers to represent amounts of money, in addresses, with symbols such as "%" and "lb.," in decimal representations and for specific dates.

Use the same structure for all portions of ideas that demonstrate a comparative relationship, such as "4 of the 310 members." Use commas between every three digits from the right in large numerals ("1,000" and "352,000,000"). Type symbols such as "$" for money amounts and percentages in MLA. Use consistent order for information in dates: day-month-year with no punctuation (12 January 1990) or day-month-year with a comma after the day and another after the year unless the date appears at the end of a sentence (January 12, 1990).

• MLA Handbook for Writers of Research Papers (7th edition); Modern Language Association; 2009

Kristie Sweet has been writing professionally since 1982, most recently publishing for various websites on topics like health and wellness, and education. She holds a Master of Arts in English from the University of Northern Colorado.

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Numbers in APA

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Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Note:  This page reflects the 6th edition of the APA manual, which is now out of date. It will remain online until 2021, but will not be updated. There is currently no equivalent 7th edition page, but we're working on one. Thank you for your patience. Here is a link to our APA 7 "General Format" page .

In general, APA style recommends using words to express numbers below 10, and using numerals when expressing numbers 10 and above. See below for a more extensive list.

Numbers expressed as numerals

In addition to expressing numbers 10 and above, the following are other instances when you would use numerals rather than words:

Numbers mentioned in the abstract, a table, or a figure in the paper (this allows for brevity) 

This study consisted of 8 tests.

Numbers that immediately precede a unit of measurement

2.54 cm, 1.5 gal

Numbers that represent statistical or mathematical functions, fractional or decimal quantities, percentages, ratios, percentiles, and quartiles

Divided by 10

50% of the participants

a ratio of 10:1

the 10 th percentile

numbers that represent time, dates, ages, scores and point values on a scale, exact sums of money, and numerals

2 hr 30 min

50-year-olds

A 10-point scale

Exception: Use words for approximations of numbers of days, weeks, months, or years

Roughly six months ago

Numbers that denote a specific place in a numbered series, parts of books and tables, and each number in a list of four or more numbers

Illustration 1

Numbers expressed as words

In addition to using words to express numbers below 10, use words to also express:

Numbers beginning a sentence, title, or text heading

Fifteen participants were in the control group.

Common fractions

Three fourths of the population

Common phrases or groups

Seven Wonders of the World

The Three Musketeers

Other Rules Concerning Numbers

Here are a few more rules concerning numbers to adhere to as you follow APA style:

If you are using two modifiers against a noun, use a combination of both numerals and words

Three 5-point scales

If you’re unsure which modifier to write and which to express numerically, try it both ways. Be sure the way you express the numbers is in the clearest way possible.

Place a zero before a decimal fraction less than 1 if the statistic can exceed 1.

If the statistic cannot exceed 1, you do not need a zero.

For more specific guidelines, talk to your instructor or refer to the Style Manual.

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When to Use the Percent Sign in a Sentence (The Ultimate Guide)

By Erin Wright

To understand when to use the percent sign instead of the word percent , we need to look at the recommendations provided by all four of our primary style guides:

The Chicago Manual of Style (Chicago style)

The Associated Press Stylebook (AP style)

Publication Manual of the American Psychological Association (APA style)

MLA Handbook from the Modern Language Association (MLA style)

Note that The Chicago Manual of Style is the default guide for the publishing industry, so strongly consider following Chicago style if you don’t have a designated guide. For additional information about each guide, visit “ Which Style Guide Is Best for You? ”

Before we begin, here are several tips for writing the percent sign regardless of which style guide you follow.

Four Tips for Writing the Percent Sign in a Sentence

1. Don’t include a space between the percent sign and the numeral.

Not-so-good: 15 %

2. When possible, rewrite sentences that start with a numeral and percent sign or add an introductory word or phrase so that the numeral–percent sign combination doesn’t appear at the beginning.

Not-so-good: 17% of the inventory was moldy.

Good: Unfortunately, 17% of the inventory was moldy.

3. Only use the percent sign with numerals, not spelled-out numbers.

Not-so-good: Over thirty-seven% of the county fair tickets were sold before opening day.

Good: Over 37% of the county fair tickets were sold before opening day.

4. Always pair the percent sign with a numeral; don’t use the percent sign as a standalone abbreviation for the noun percentage .

Not-so-good: Only a small % of voters requested mail-in ballots.

Good: Only a small percentage of voters requested mail-in ballots.

When to Use the Percent Sign according to Chicago Style

The Chicago Manual of Style (Chicago style) has separate recommendations for nontechnical and technical content.

For nontechnical content, Chicago style suggests using numerals and the word percent instead of the percent sign. However, if the number falls at the beginning of the sentence, it should be spelled out rather than written as a numeral. 1

The survey showed that only 9 percent of employees liked the company’s new cafeteria food.

Twenty-seven percent of the art students preferred pastels to colored pencils.

For technical content, Chicago style suggests using numerals with the percent sign. But, use the word percent if the number appears at the start of the sentence with a spelled-out number. 2

Of the 500 cats in the study, 17% refused to play with the research toys.

Ninety-five percent of the native trees and 75% of the feed crops survived the drought.

Nontechnical Content versus Technical Content

The line between nontechnical and technical content is sometimes blurry. For example, an article about astrophysics is most likely (very!) technical. However, simpler content, such as a marketing brochure for the general public, might still be considered technical if it includes a lot of numbers. In those borderline situations, choose the style you believe will best serve your audience.

When to Use the Percent Sign according to AP Style

The Associated Press Stylebook (AP style) recently updated its recommendations for using percent signs. Previously, AP style used the word percent with numerals. 3 Now, AP style uses the percent sign with numerals in formal content. 4

The charity drive collected 33% more donations this year.

If you are referring to a percent generically or casually, AP style suggests spelling out the number and using the word percent . 5

Bob said, “I thought I had about a one percent chance of finding my lost wedding band. But here it is.”

If a percent must appear at the beginning of a sentence, spell out the number and use the word percent . 6

Forty-seven percent of participants preferred ankle socks more than calf-length socks.

When to Use the Percent Sign according to APA Style

The Publication Manual of the American Psychological Association (APA style) recommends using numerals with the percent sign within a sentence. 7

The grocery store saw a 42% increase in ice cream sales in July.

APA style also recommends using the word percent with spelled-out numbers at the start of a sentence. 8

Fifty-three percent of the moviegoers ate popcorn; 7% ate smuggled-in candy.

When to Use the Percent Sign according to MLA Style

The MLA Handbook (MLA style) recommends spelling out numbers and the word percent when they can be written in less than three words. 9

The professor was disappointed that only seventy-five percent of the class finished the assignment.

If the numbers can’t be written in less than three words, use numerals with the percent sign. 10

Home values increased 25.2% in the last year.

In number-heavy documents, the MLA Style Center recommends using numerals with the percent sign (although presumably not at the start of a sentence). 11

After training, 83% of the shelter dogs could follow sit and stay commands.

Related Resources

Three Tips for Starting a Sentence with a Number

When to Hyphenate Numbers with Units of Time

How to Write Large Numbers

• The Chicago Manual of Style , 17th ed. (Chicago: University of Chicago Press, 2017), 9.18.
• The Associated Press Stylebook 2018 (New York: Associated Press, 2018), 221.
• The Associated Press Stylebook 2022–2024 (New York: Associated Press, 2022), 223.
• Publication Manual of the American Psychological Association , 7th ed. (Washington, DC: American Psychological Association, 2020), 6.44.
• Publication Manual of the American Psychological Association , 7th ed. (Washington, DC: American Psychological Association, 2020), 6.33.
• MLA Handbook , 9th ed. (New York: Modern Language Association of America, 2021), 2.131.

Updated June 24, 2022

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