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Do You Spell Out Percentages In An Essay

Q: Sometimes I see numbers spelled out (nine) and at other times I see them in numeric form (9). Which is correct? When do I spell out numbers and when do I write them out? —Kevin T.

A: Most writers—including me—took on this artistic profession for three reasons: We’re creative, we love to read and, most important, we want to avoid numbers at all costs. Yet somehow, even in writing, numbers have found a way to sneak back into our lives.

There are several rules of thought on how to handle writing numbers, but the most common is pretty simple. Spell out numbers under 10 (zero through nine), and use the numeric symbols for numbers 10 and up. I bought eight candy bars from the vending machineI average eating 29 candy bars per month.

There are some exceptions to the rule. For example, spell out all numbers that begin a sentence. Forty-seven-thousand contestants were turned down for “American Idol.”Eleven were selected. Of course, there’s an exception to the exception: Don’t spell out calendar years, even at the front end of a sentence. 1997 was the year I met my wife. And, if you don’t feel like writing those long, awkward-looking numbers, just recast the sentence. American Idol turned down 47,000 contestants.  I met my wife in the magical year of 1997.

Also, there are other instances where the under-10/over-10 rule doesn’t apply.  Always use figures for ages of people (“He’s 9 years old”), dates (February 14), monetary amounts ($8), percentages (14 percent) and ratios (2-to-1).

Again, this is a style issue and other sources may suggest different ways of handling numbers. So please, no hate mail. And let’s agree not to talk about numbers for the rest of the day—they make my head hurt.

Check out these Grammar Rules to help you write better:
Sneaked vs. Snuck
Who vs. Whom
Lay vs. Lie vs. Laid 
Which vs. That
Since vs. Because
Ensure vs. Insure
Home in vs. Hone in
Leaped vs. Leapt

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Brian A. Klems is the editor of this blog, online editor of Writer’s Digest and author of the popular gift bookOh Boy, You’re Having a Girl: A Dad’s Survival Guide to Raising Daughters.

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I’ve had a love affair with words and grammar pretty much my entire life. Math? Not so much. It’s useful, yes. Important too. But having to apply it is like going to the dentist — something I need to do even if I’m less than thrilled about it. So it’s with the greater good in mind that I tackle the use of percent, percentage, percentage points and related questions. You’re welcome.

Percent vs. Percentage

Although some sources (the mercurial Merriam-Webster’s being one of them) suggest that percent and percentage are interchangeable, the more traditional approach is to use percent with a number and percentage with no number:

A surprisingly high percentage of college freshmen drop out.

More than 25 percent of college freshmen drop out.

No style guide that we know of supports using numerals with percentage. For that reason, the following construction is incorrect:

The percentage of college freshman who drop out is higher than 25.

You’d either need to add “percent” at the end of the sentence or rewrite to avoid using “percentage/percent” in the same sentence. The latter approach is preferable but not always possible, as in sports stories. For example:

Tater and Tot had the highest field goal percentages for the night, shooting 63 and 68 percent, respectively.

Percent vs. Percentage Points

Suppose you encounter the following news item:

Interest rates jumped from 6 to 9 percent.

Would you say interest rates increased by 3 percent or by 3 percentage points? The latter is correct. Here’s why …

Percent change is the ratio of two values (the difference between the new value and the old value, divided by the old value). Using the above example, (9-6)/6 = .50. So you could correctly say either of the following:

Interest rates increased by 50 percent.

Interest rates increased by 3 percentage points.

The easy way to remember which term to use is this: If you’re just subtracting one percentage from another (9% – 6%), use percentage points to talk about the difference.

Words vs. Symbols

Whether to spell out percent or use the % symbol is largely a matter of style, as is using numerals versus spelling out the numerical values.

The Chicago Manual of Style, for instance, says that percent is usually used in nontechnical contexts, while % is more common in scientific and statistical copy. Numerals are used in all instances with percent except at the beginning of a sentence.

The AP Stylebook always spells out percent because the symbol doesn’t translate between AP and newspaper computers. It also always uses numerals with percent except at the beginning of a sentence.

Both the AMA and APA style guides say to use % with numerals in all cases except at the beginning of a sentence.

Some clients have their own style. The important point is to apply whatever style you choose consistently.


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