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Note: This page reflects the 6th edition of the APA manual, which is now out of date.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.
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
Numbers that represent statistical or mathematical functions, fractional or decimal quantities, percentages, ratios, percentiles, and quartiles
50% of the participants
the 10 th percentile
numbers that represent time, dates, ages, scores and point values on a scale, exact sums of money, and numerals
A 10-point scale
Exception: Use words for approximations of numbers of days, weeks, months, or years
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
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.
Three fourths of the population
Common phrases or groups
Seven Wonders of the World
The Three Musketeers
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.