Spell out one through nine, except in headlines. See Headlines.
Use figures for 10 and greater, and for units of measure and ages: 3 miles; 18 years old.
For ages, percentages, temperatures and measurements, always use figures, even for numbers less than 10:
- She was 6 years old when she decided she wanted to be a Sun Devil.
- He lived just 3 miles from ASU's West campus.
- It was minus 3 degrees when she checked the thermometer. It was 3 degrees below zero at the time.
Use figures for all numbers in tabular material and statistical and sequential forms.
When writing about rankings in headers, banners and body copy, use No. and figures: U.S. News & World Report ranks ASU No. 1 for innovation. Exception: Innovation ranking lockup with U.S. News & World Report badge.
Spell out a number at the beginning of a sentence except for calendar years:
- Twenty people registered for the seminar.
- 1976 was a very good year.
A numeral-and-letter combination may start a sentence:
- 3D metal printing seminars are scheduled in July. (Note that 3D has no hyphen!)
Spell out casual references:
- ASU attracts thousands of international students each year.
- He walked a quarter of a mile.
Do not use both a word and numeric version of a number in a sentence:
- Choose one of the sessions.
- Not: Choose one (1) of the classes.
See Punctuation and symbols.
Amount refers to quantities measured in bulk or mass but considered as a whole. Number refers to things that can be counted individually:
- The amount of square feet in the classroom is enough to include a lab.
- The total number of square feet in the classroom includes a lab.
Use a decimal point and numerals. For amounts less than one, add a zero before the decimal point and use the singular form of the measurement singular:
- 0.35 meter.
- 0.55 cubic foot.
- 0.75 kilometer.
For grade point averages, include the hundredths place unless there are special circumstances:
Use lowercase for denominations: dollar, cent, euro.
Spell out euros: 1,000 euros. Do not use €.
Use the dollar sign with numerals in all cases except casual references of amounts without a numeral: about a hundred dollars.
For amounts less than $1 million, do not include decimal places:
For amounts more than $1 million, use two decimal places if available.
Do not link the numerals and the word with a hyphen:
- Professor Jones was awarded a $4.35 million grant.
- He expended exactly $4,349,242 over the course of the grant.
- They proposed a $300 billion budget.
- Not: $4.35M (except in tabular format), $300 Billion.
Spell out fractions less than one in text, using hyphens between the words: two-thirds, seven-sixteenths.
Use figures for precise amounts larger than one, converting to decimals when possible.
In tabular formats
Use figures exclusively, converting to decimals if the amounts involve extensive use of fractions that cannot be expressed as a single character.
Use the numerals with an en dash and no spaces: The program is designed for teachers in grades 7–12.
Note: To create an en dash: Mac — Option+Minus keys; PC — Ctrl+Alt+Minus keys. See en dash.
Spell out first through ninth and use figures for 10th and above, unless the nonstandard ordinal is part of an official name or title.
Do not use superscript formatting. Note: Superscript ordinals is the default in Microsoft Word. You may disable this option by following this procedure.
An AP style guidelines change in 2019, use the % sign when paired with a numeral, with no space, in most cases. Use whole figures and decimals, not fractions, for percent and percentages:
- 4 percentage points
For a range of percentages, use "to" or “and” rather than a hyphen:
- 12% to 15%
- between 12% and 15%
For amounts less than 1%, precede the decimal with a zero:
- The cost of living rose 0.6%.
In casual uses, use words rather than figures and numbers:
- The latecomer had a zero percent chance of being first in line.
For the word percent, percentages, see Word list.
Use figures and hyphens, no spaces between. Always include ratio or other noun with the figures.
- 22-to-1 student-to-faculty ratio
- a majority of 7-to-3