do you have to type 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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• Writing numbers: words and numerals

APA Style Guidelines for Numbers | Words or Numerals?

Published on August 7, 2015 by Sarah Vinz . Revised on July 23, 2023.

Numbers can be written either as words (e.g., one hundred) or numerals (e.g., 100). In this article we follow the guidelines of APA Style , one of the most common style guides used in academic writing .

In general, words should be used for numbers from zero through nine, and numerals should be used from 10 onwards. This is true for both cardinal numbers (e.g., two, 11) and ordinal numbers (e.g., second, 11 th ). However, there are some important exceptions to this rule.

Note that other style guides, such as Chicago Style,  address numbers differently (for example, in Chicago, you use words for numbers up to 100). Regardless of what style guide you follow, the most important thing is to be consistent in how you treat numbers throughout your document.

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Table of contents

Writing percentages, reporting statistical results that include numbers, writing numbers that are accompanied by measurements, writing long numbers, consistency may not be obvious, other interesting articles.

Use numerals for numbers from zero to nine that are followed by a precise unit of measurement.

The samples measured 7 cm in diameter. (“cm” is a unit of measurement)

But: These three samples were subjected to further testing.

Use words for any number that is used to start a sentence, with the exception of years.

Seventy-two thousand ink cartridges are sold every day.

Nineteenth-century novels often feature complicated plot lines.

But: 2008 saw record olive crops throughout the Mediterranean.

Use words for common fractions and set expressions.

According to the survey, two thirds of the employees are dissatisfied.

Understanding the Five Pillars of Islam is a critical first step.

The Fourth of July is traditionally marked by a firework display.

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With percentages, the standard is to use numerals and “%” (not “percent”).

According to the report, 45% of the workforce is employed in the service sector. Only 6% currently work in agriculture.

The main exception is if you are using a percentage to begin a sentence. In this case, use words to express the entire percentage.

Thirteen percent of the patients reported that their symptoms improved after taking the experimental drug.

If your paper includes quantitative research, you probably have data to report. Statistics, mathematical functions, ratios, and percentages are all written using numerals. This is true regardless of whether they are included within a table or as part of the actual text. Keep the following guidelines in mind:

• Report most statistics to two decimal places (such as M = 5.44).
• Report statistics that could never exceed 1.0 to three decimal places (such as p < .001).
• If a value has the potential to exceed 1.0, use the leading zero. If a value can never exceed 1.0, do not use the leading zero.
• Italicize values that are not Greek letters (such as M , SD , p , and F ).
• Include spaces before and after =, >, and <.

The average IQ of the participants was relatively high ( M = 137.33, SD = 4.54).

The results of the second test were statistically significant, t (12) = 4.11, p < .05.

There are further detailed guidelines about reporting statistics in APA .

If a number comes immediately before a unit of measurement, use numerals.

Each patient received  5 mg  of the experimental drug.

The tallest participant was 2.03 m .

Also use numerals for precise ages, times, dates, scores, points on a scale, and amounts of money.

The final score of Ghana 2, Brazil 1 did not represent a decisive victory.

Children under 8 years receive a $50 discount.

But: Most girls start reading when they are about five years old. (“about” makes the number imprecise)

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Longer numbers follow specific rules:

• Use a period to indicate a decimal point.
• Starting with 1,000, use commas to separate every three digits.

The region has an average of 43.75 doctors for every 10,000 people.

Some predict that the number of users will reach 2 billion by 2020.

One of the main reasons why writing numbers is complicated is that consistently applying the rules may lead to a text that actually seems very in consistent. Consider the following paragraphs:

At about the age of seven , the girl’s height was 1.47 m. This placed her in the fifth percentile, although her weight placed her in the top 7% of her class. By the time she was 9 years old, she was taller than half of the boys in her year. Five years later, she was still ranked 15 th .

Thirteen thousand viewers watched the performance of Shakespeare’s Twelfth Night from the park, while another 2,000 watched from the surrounding buildings and 1.2 million watched it on television. As one  out of every 11 residents saw at least part of the play, this one event can definitely be considered a success.

These texts may look awkward because so many different number formats have been used, but don’t be deceived – the above guidelines have all been followed.

If you are not required to strictly follow a particular style (such as APA format ), you may have some flexibility to modify the guidelines presented in this article. Just be sure to apply any modifications you make throughout your entire document.

If you want to know more about AI for academic writing, AI tools, or fallacies make sure to check out some of our other articles with explanations and examples or go directly to our tools!

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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 Numbers in an Essay

Rules for Using Numbers in APA Format

Four p.m. or 4 p.m.? 1950s or 1950’s? Writing an essay or paper can be challenging enough. Start to consider the various formatting rules that exist for including numbers in your essay, and you might find yourself overwhelmed by the conventions of writing. Fortunately, these rules are actually fairly straightforward and easy to remember. Review and practice them and they’ll soon become second nature, allowing you to spend less time thinking about guidelines and more time thinking about your writing.

Standard Numbers

When writing numbers in your essay, the general rule is that whole numbers below 10 should always be spelled out. You would assert that there are "three cars" or "eight baseballs." Numbers 10 and above should be written in numeral form: "21 bugs," "52 cards." When a number below 10 is grouped with a number above 10, the rule for the higher number takes precedence: "8 to 12 weeks."

Statistical Measures

Exact statistical measures, such as percentages, decimals, and mathematical operations, should always be written in numeral form. For example, “The success rate is 8%,” “Fill 5.5 cartons,” or “Divide the answer by 2.”

Use numerals for dates, times, and ages. For example, "October 27, 1986," "4 p.m.," or "37 years old." Spell out the number when writing out a time, such as "eleven o'clock."

Identification Numbers

Identification numbers should be written as numerals: "Room 7," District 4," "Channel 22."

Write years and decades in numeral form. Something might take place in 2005 or in the 1990s (decades do not use an apostrophe before the "s"). Centuries can be spelled out ("fifteenth century") or written in numeral form ("18th century").

Beginning of Sentence

Numbers that begin a sentence should always be spelled out: "Sixty-seven movies were released last month." However, for prose purposes, avoid using numbers at the beginning of sentences.

Inexact Numbers

Spell out rounded or inexact numbers. Also spell out common fractions. You might say there were "about a thousand" people at a gathering, or that "one-quarter of the audience found it funny."

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• Writing Rules: Spelling Out Numbers

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Numbers & Statistics 

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Writers often need to discuss numbers and statistics in their manuscripts, and it can be a challenge to determine how to represent these in the most readable way. APA 7 contains detailed guidelines for how to write numbers and statistics, and the most common are listed below. These guidelines, however, are not exhaustive and writers may need to evaluate particular instances of numbers in their own writing to determine if the guideline applies or if an exception should be made for clarity.

Numbers 

Generally, you can spell out numbers below 10 in words (seven, three), and use numerals for anything 10 and higher (10, 42). 

• You should use Arabic numerals (1, 7) instead of Roman numerals (II, XI) unless the Roman numerals are part of established terminology in your field. 
• In numbers greater than 1,000, use commas to separate groups of three digits except in page numbers, binary code, serial numbers, temperatures, acoustic frequencies, and degrees of freedom. 
• Do not add apostrophes when writing a plural of a number (the 2000s, the 70s).

Use a numeral in these cases:

• a number 10 or higher anywhere in the paper
• a number right before a unit of measurement (3 m, 24 g)
• a number denoting: mathematical functions, fractions, decimals, percentages, ratios, percentiles (2:1 ratio, 5%)
• a number denoting: time, a date, an age, a point on a scale, an exact amount of money, or a numeral (the 3 key on your keyboard, 7 years old, a 5 on the test)
• a number indicating a place in a series or a part of a book/table, if the number is after a noun (i.e., Item 4, but words are used in cases like "the fourth item")

Spell the number out in words in these cases:

• a number from 0-9 anywhere in the paper, except the specific cases above
• a number that starts a sentence, heading, or title (though this should be avoided)
• a number that is a common fraction (one half, two thirds)
• a number that is part of a common phrase (Noble Eightfold Path)

When numbers are written next to each other in a sentence, one strategy to help readers parse the sentence is to combine words and numerals (3 two-year-old owls, four 3-step plans), but rewording to separate the numbers may be the best choice for clarity in some cases. Clarity for readers is always the most important consideration.

Ordinal Numbers 

Treat ordinal numbers (3rd, fourth) the same way as other numbers, using the guidelines above. You may use a superscript or not (1 st , 1 st ), but you should maintain the same usage throughout your paper.

Decimal Fractions 

In numbers less than 1, writers may include a leading 0 before the decimal point or not. This choice is based on the maximum possible amount of the statistic:

• If the statistic can be greater than 1, use a leading 0 (0.24 in)
• If the statistic cannot be greater than 1, do not use a leading 0 (p = .042)

APA's general principle for rounding decimals in experimental results is as follows, quoted here for accuracy: "Round as much as possible while considering prospective use and statistical precision" (7th edition manual, p. 180). Readers can more easily understand numbers with fewer decimal places reported, and generally APA recommends rounding to two decimal places (and rescaling data if necessary to achieve this).

Some more specific guidelines for particular values are listed below.

One decimal place:

• standard deviations

Two decimal places:

• correlations
• proportions
• inferential statistics
• exact p values (can be reported to two or three places; when p is less than .001, write p < .001)

Statistical Copy 

These rules cover presentation of data, not accuracy of data or the best way to conduct analysis.

You can represent data in the text, in a table, or in a figure. A rule of thumb is:

• <3 numbers → try a sentence
• 4-20 numbers → try a table
• >20 numbers → try a figure

Clarity is always paramount.

When discussing statistics in common use, you do not need to provide a reference or formula.

If the statistic or expression is new, rare, integral to the paper, or used in an unconventional way, provide a reference or formula.

The purpose of reporting statistics is usually to help readers confirm your findings and analyses; as such, the degree of specificity in reporting results should follow in line with that purpose.

When your data are multilevel, you should include summary statistics for each level, depending on the kind of analysis performed. When your data are reported in a table or figure, you do not need to repeat each number in the text, but you should mention the table or figure in the text when discussing the statistics and emphasize in-text key data points that help interpret your findings. 

Use words like "respectively" or "in order" to clarify each statistic mentioned in text and their referent.

For instance:

Confidence intervals should be reported: 90% CI [ LL, UL ], with LL as the lower limit and UL as the upper limit of the interval. You do not need to repeat confidence intervals in the same paragraph or in a series when the meaning is clear and the confidence interval has not changed. When CIs follow the report of a point estimate, you do not need to repeat the unit of measurement.

Statistics uses a great deal of symbols and abbreviations (when a term can be both, the abbreviation refers to the concept and the symbol indicates a numeric value).

You do not need to define these when they represent a statistic or when they are composed of Greek letters. You do need to define any other abbreviation (such as ANOVA, CFA, SEM) in your paper. If the analysis you are performing uses multiple notation styles for symbols and abbreviations, only use one consistently throughout your paper.

Some other statistical symbol guidelines include:

• use words rather than symbols in narrative text; when you report a stats term with other mathematical symbols like = or +, use the symbol
• population parameters use Greek letters while estimators use Latin letters in italics (usually)
• uppercase, italicized N indicates the total membership of a sample; lowercase, italicized n indicates the membership of a subgroup of a sample such as a treatment group or control group
• % and currency symbols like $ should only be used with numerals (15%, $25) or in table headings and figure labels to save space
• use standard type (no italics or bold) for Greek letters, subscript and superscript identifiers, and abbreviations that are not variables such as log
• use bold type for vector and matrix symbols
• use italics for all other statistical symbols

Mathematical Copy 

For ease of reading, use spaces between elements in a mathematical expression ( a + b = c ), except in the case of a minus sign indicating a negative number which uses a space before the minus but not between the minus and the numeral.

Use subscripts first and then superscripts, except in the case of key symbols like the superscript for prime.

All equations should be punctuated to fit in the syntax of the sentence, even if they are presented on their own line.

Short, simple equations can be written in a regular line of text, with a slash (/) for fractions. Parentheses, square brackets, and braces should be used (in that order, from innermost to outermost) to indicate order of operations. Equations that do not fit vertically in the line of text should be shown on their own line. 

All displayed equations (equations on their own line) should be numbered, similarly to tables and figures, so that they can be referred to later (and simple equations may be displayed rather than written in a line of text if they will need to be referred to later by number).

In text, equations should be referred to by name (Equation 1 or the first equation are both acceptable). The equation number does not need a special label, and instead should be displayed in parentheses toward the right margin of the page:

  If a symbol in your equation cannot be entered with your word processor, use an image; otherwise, type all equations exactly as you would like them to appear in the publication.

When to Write Out Numbers: What Chicago, APA, and MLA Say About Numerals

by Kaelyn Barron | 14 comments

Wondering whether or not you should spell out the numbers in your school report, novel, or blog?

It can be difficult to keep the rules straight, especially when we see different styles used all across the internet or in our casual correspondences. But we’ve broken down the rules for you with this simplified guide so you never have to wonder again!

Spelling Out Numbers: The General Rule

The most generally accepted rules for writing out numbers in non-scientific and non-technical contexts are as follows:

• Spell out all numbers between zero and ten.
• When numbers are used to start a sentence , they should always be spelled out .

Twenty-four thousand applications were submitted in 2018.

When dealing with technical or scientific writing , numerals can be used for all numbers above ten. 

( Numerals are symbols that are used to denote numbers, such as 1, 2, 11, 23… )

However, the most important thing to remember in any kind of writing is consistency. Even if your chosen style differs from this general rule, what matters is that you stick with that style throughout your writing.

Style Guides

Some style guides offer their own specific rules for spelling out numbers. If you have a designated style guide, be sure to always reference that when in doubt.

Chicago Manual of Style

The Chicago Manual of Style lays out the following rules for spelling out numbers:

• Spell out numbers zero through one hundred
• Use numerals for numbers over one hundred
• Spell out certain round numerals , specifically: whole numbers one through one hundred followed by hundred , thousand , or hundred thousand ), except in monetary amounts or percents
• Seventy-two
• One thousand
• Two hundred thousand
• Seventy thousand
• Two hundred

Additionally, when two numbers need to be placed next to each other, it’s best to spell out one of them (usually the smaller amount).

• 10 nine-inch boards
• three 12-foot waves

APA Style Manual

The APA Style Manual lays out the following rules for spelling out numbers:

• Spell out numbers below 10
• Use numerals for numbers 10 and greater

MLA Style Manual

The MLA Style Manual lays out the following rules for spelling out numbers:

• Spell out numbers that can be written with one or two words
• Use numerals for all other numbers

Numbers in Blogs

If you write blog posts, your company might have a preferred style for you to use. But if it’s up to you to decide, the following suggestions might help:

• Spell out numbers from zero to nine
• Use numerals for numbers ten and greater
• Don’t start sentences with numerals
• Headlines that start with numerals (such as “7 Tips…”) tend to generate more social shares and engagement

When to Hyphenate Numbers

If you do need to spell out larger numbers, a hyphen might be necessary. See the following rules:

• Always hyphenate compound numbers between twenty-one and ninety-nine (this does not include numbers ending with 0)
• If you need to write out numbers higher than ninety-nine, do not use a hyphen; use “and” instead
• Sally is thirty-three years old.
• Forty-seven candidates were accepted last year.
• Three hundred and forty-two dogs were rescued.

Numbers or Numerals?

To keep your writing clear and consistent, it’s important to know when to spell out numbers and when to use numerals.

When in doubt, always refer to your designated style guide for the most clear details and rules.

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As a blog writer for TCK Publishing, Kaelyn loves crafting fun and helpful content for writers, readers, and creative minds alike. She has a degree in International Affairs with a minor in Italian Studies, but her true passion has always been writing. Working remotely allows her to do even more of the things she loves, like traveling, cooking, and spending time with her family.

14 Comments

My former coworker started the following practice: When using a number ten and below, write the number out and then include the number in parentheses – for example, “there are ten (10) instances…”. If the number is greater than ten, use the number alone – for example, “there are 20 instances…”. Is this practice used by others?

I was hoping for an answer to Ms. Gregory’s question as well. Ms. Barron could you please reply soon as this comment was quite recent 06.30.2023.

I’m a writer and I’m thinking it might be kind of nice to see both as shown in Ms. Gregory’s comment. Maybe something I’ll have to start using.

I believe that genealogical journals use the Chicago style regarding spelling out numbers. Is that correct? Thanks.

For Chicago Style, “over 1200 reports.” Should there be a coma between the thousandth and hundredth place, 1,200?

Hi. For CMS, I would like to ask when to use “million” and “000,000,000”? Thank you.

How does one write a percentage? Example: .02.4%

Hi James! which style guide do you use? For example, Chicago requires you to use numerals and the word “percent” (as in 2 percent”), whereas for AP it would be 2%.

Thank you. The information with numbers was very helpful.

You’re very welcome, so glad you found it helpful! :)

When numbers both greater and less than 10 are used in a series, should they all be either spelled or numerals? For example “…seven bird and eleven mammal species” or “…7 bird and 11 mammal species” rather than “…seven bird and 11 mammal species”?

How do I report results from a table included in a scientific paper? For example, can I write “males accounted for 21 (70%) of respondents, and females accounted for 9 (30%)”? Thank you.

Hi Manon, yes, you can write the numbers and percentages that way for a scientific report. To be more thorough, you might write “for 21 (70%) of the 30 respondents”

Outstanding, Ms. Barron! Clear, concise… easy to understand. Thank you for including the different styles. Thank you for your article!

Thanks Marcus, I’m so glad you enjoyed the article! :)

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