Numbers and Percentages

We follow AP Style for numbers in most cases.

• Spell out numbers one through nine
• Use numerals for 10 and above

This also applies to ordinal numbers:

• first through ninth
• 10th and above

For big numbers, use a numeral and a word:

• 1.6 million people
• $2.7 million
• 5 cents

For amounts under $1 million, use the dollar sign:

• $17

Use numerals in:

• Page titles
• Subheadings
• Interface labels

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This makes content easier to scan.

Use the full four-digit year:

• 2025

For informal writing, it’s okay to shorten it:

• Web design isn’t stuck in the ’90s.

• Spell out percent in most writing:
  • Only 12 percent of users responded.
• Use the percent sign (%) in:
  • Tables
  • Technical or scientific writing
  • Headings and subheadings
  • Interface labels
  • Captions and infographics
• 60% of participants reported side effects
• Candidate Woof takes 7% lead

This helps readers scan and understand content faster.