Numbers and measurements

Style for numbers and measurements supports accessibility and readability for users.

  • Choosing numerals or words

    Numbers as numerals are generally easier for people to scan. Numbers as words remain a convention that people expect in some types of content.

  • Currency

    Use the correct numbers, words and symbols for currency so people are clear about the amount.

  • Dates and time

    Dates and times need to be readable. Write, abbreviate and punctuate dates and times consistently so people can understand your content.

  • Fractions and decimals

    Decimals are useful when people need a precise value. Fractions are useful when an exact value is not important.

  • Mathematical relationships

    Words can express mathematical relationships in most content. Code mathematical expressions in specialist content so it’s accessible.

  • Measurement and units

    Standard units of measurement support readability and accuracy. Express precise values for users by combining numerals with the correct unit symbol.

  • Ordinal numbers

    Ordinal numbers such as first, second and third show the order and importance of things.

  • Percentages

    Percentages help people compare things and understand proportions. Use numerals with the percentage sign. Be concise when you write about percentages.

  • Telephone numbers

    Write telephone numbers so people can read and use them easily. There are rules for grouping the numbers, using spacing and creating links.

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