Five or 5? Words versus numerals...

May 2016

Earnsy Liu, TechCommNZ member and GDID student, looks for evidence (not just opinions) to help you manage the daily conundrums we face in our profession. If you have a question for Earnsy to tackle, please email our Comms Coordinator.

Do you write numbers in words or numerals? I prefer numerals – for example, 5 instead of five – because I think they’re easier to read. But is that right? Let’s look at the (limited) research on words versus numerals and the pros and cons of numerals. What’s recommended, and are there exceptions to the rule?

Limited research

Usability expert Jakob Nielsen (2007) established that ‘numerals often stop the wandering eye … even when they're embedded within a mass of words that users otherwise ignore’. He explains how numbers grab attention:

How do users' eyes locate numerals while skipping past words? The shape of a group of digits is sufficiently different from that of a group of letters to stand out ... 2415 looks different than four even though both consist of 4 characters.

Digits enhance the scannability of web content. It's that simple.

To him, numbers are special:

Why do users fixate on numerals? Because numbers represent facts, which is something users typically relish. Sometimes people are looking for specific facts, such as a product's weight or size, so product pages are certainly one place where you should write numbers as numerals. But even when a number doesn't represent a product attribute, it's a more compact (and thus attractive) representation of hard information than flowery verbiage.

Nielsen doesn’t describe his methodology in the article, nor does he say when the research was conducted. It may be from the 1990s, since other articles of that time seem to link to the same research. But since his colleague re-iterated the advice to use numerals just two years ago (Loranger, 2014), they probably think it still applies.

Apparently, a 1987 study by the UK’s Department of Health and Social Security also found a preference for numerals (cited in Carr, 2010, p. 14).

These two seem to be the only studies comparing numerals and words, although some eye-tracking studies have looked at other aspects of numbers, such as how readers decide which number is larger (Merkley and Ansari, 2010). I thought a scientific experiment showed that the brain responded more to numerals than to similar stimuli (such as letters, scrambled numerals or letters, or foreign numerals). But one of the authors said I had drawn the wrong conclusion. Rats.

Pros and cons of numerals

Some advantages of numerals include:

  • easier to read (Cutts, 2009)
  • easier to scan (Nielsen, 2007)
  • more usable information (Nielsen, 2007)
  • greater credibility because the facts stand out (Nielsen, 2007)
  • easier for weak readers (personal communication from a learning difficulties teacher, January 7, 2016).

Strangely enough, there don’t seem to be many arguments for using words instead of numerals, possibly because that’s the norm. It was easier to find disadvantages of numerals, including:

  • being too informal (Michael, n.d.)
  • distracting readers from the message by being unconventional (Carr, 2010).

Do the disadvantages outweigh or equal the advantages? Perhaps. The Plain Language Commission (n.d.) previously used numerals but now write small numbers in words:

After a spell when we used figures for all numbers in text, we’ve reverted to the more conventional style of putting one to nine in words and 10+ in figures. The all-figures style seemed to have as many anomalies as the conventional approach.

What’s recommended

There’s no golden rule on using words or numerals, although most authorities recommend writing small numbers in words.

Use words or numerals? Authority Remarks
Numerals only Cutts (2009) Except 1 style guide (2015) Except 0 and 1 when appropriate
Nielsen (2007) Web writing only
Words for 1-9 BBC News style guide (n.d.)
Ministry of Health (2012)

Reuters (2016)

Words for 1-10 Carr (2010) Plain Language Commission
National Geographic
“Numbers and dates” (2012) Technical material
Words for 1-99 “Numbers and dates” (2012) Non-technical material
Words for 1-100 Chicago Manual of Style Online (n.d.) Non-technical material

Nielsen’s recommendation explicitly refers to writing for the web. He argued previously that web users prefer concise, scannable and objective writing (Morkes and Nielsen, 1998).

But surely all documents should be easy to scan and provide credible, usable information? Communications lecturer Judy Gregory (2004) has argued that similar guidelines apply to both media, and that differences may have more to do with genre: discussions about ‘print’ tended to refer to novels and newspaper articles, and ‘web’ to business and government policies.

If the Department of Health and Social Security found a preference for numerals in 1987 – before the World Wide Web was invented (“Digital revolution,” 2016) – perhaps Nielsen’s recommendations should apply to print too.

Except …

Regardless of the size of the number (greater or less than 10, etc.), there are exceptions to the guidelines above. Here are a couple:

Beginning sentences

Most authorities recommend writing numbers at the beginning of a sentence in words rather than numerals (BBC, n.d.; Carr, 2010; National Geographic, n.d.; “Numbers and dates,” 2012). This will avoid ‘the potentially confusing sequence of a full stop, space then figure’ (Carr, 2010).

However, if that creates an awkward sentence like ‘Three hundred and twenty-seven protesters attended the rally ...’, try to re-write the sentence so it does not start with a number (National Geographic, n.d.; Reuters, 2016).

Nielsen (2007), on the other hand, still recommends using numerals at the start of a sentence on the web.

Several numbers together

If there are several numbers together, guidelines vary:

  • You could separate them (“Numbers and dates,” 2012; Reuters, 2016), such as ‘ten vans weighing two tonnes each’, rather than ‘ten two-tonne vans.’
  • You could use numerals (“Numbers and dates,” 2012; Reuters, 2016). The Chicago Manual of Style (CMOS, n.d.) suggests: ‘To avoid a thickly clustered group of spelled-out numbers, numerals may be used instead in exception to the general rule [of writing out 1-100].’ A college student asked about applying the exception to this sentence:

Of the 400 members, about 300 were over 60 years old, but at least 50 were under the age of 30.

The CMOS replied:

Your editing would make it easier for some readers to take in the numbers, while others would be distracted by a perceived inconsistency. ... You decide based on how consistent the text is to begin with, how much work it will be to carry out a change throughout a document, and how likely it is that you’ll end up introducing inconsistencies. You weigh the work and the dangers against what you think most readers will find helpful. There’s usually no “correct” winner; it’s a judgment call.

  • You could favour consistency. National Geographic urges writers to ‘avoid using figures for some and spelling out others’. To them, it’s fine to write ‘During the past five years twelve new ten-story office buildings have gone up between old structures of three or four stories’ (National Geographic, n.d.).

There are more exceptions and special cases, but too many to discuss here. To get a taste of them, check out the Chicago Manual of Style’s three pages of Q&As on numbers.


BBC. (n.d.). Numbers. Retrieved January 14, 2016, from BBC News Style Guide website:

Carr, S. (2010). Numbers. In M. Cutts (Ed.), Plain Language Commission style guide. Retrieved January 4, 2016, from Plain Language Commission website:

Chicago Manual of Style Online (n.d.). Numbers. Retrieved January 5, 2016, from

Cutts, M. (2009). Oxford guide to plain English (3rd ed.). New York, NY: Oxford University Press.

Digital revolution. (2016, January 3, 01:22). In Wikipedia. Retrieved January 16, 2016, from style guide. (2015). Grammar. Retrieved January 14, 2016, from

Gregory, J. (2004). Writing for the web versus writing for print: Are they really so different? Technical Communication, 51(2), 276-285. Retrieved from Academic OneFile.

Loranger, H. (Mar 23, 2014). Break grammar rules on websites for clarity. Retrieved January 16, 2016, from Nielsen Norman Group website:

Merkley, R. & Ansari, D. (2010). Using eye tracking to study numerical cognition: The case of the ratio effect. Experimental Brain Research, 206(4), 455-460. Retrieved from Academic OneFile.

Michael (n.d.). 10 rules for writing numbers and numerals. Retrieved January 5, 2015, from Daily Writing Tips website:

Ministry of Health (2012). Communication standards for the Ministry of Health. Retrieved January 11, 2016, from$file/communication-standards-may-2012.pdf

Morkes, J. & Nielsen J. (1998). Applying writing guidelines to web pages. Retrieved January 11, 2016, from Nielsen Norman Group website:

National Geographic. (n.d.). Numbers. Retrieved January 11, 2016, from National Geographic Style Manual:

Nielsen, J. (2007). Show numbers as numerals when writing for online readers. Retrieved from Nielsen Norman Group website:

Numbers and dates (2012). In New Oxford style manual. (pp. 179-181.) Oxford: Oxford University Press.

Plain Language Commission (n.d.). Words or figures? Retrieved January 4, 2016, from

Reuters (2016). Numbers. Retrieved January 14, 2016, from Reuters Handbook of Journalism website: