Units of Measure Style/Notation

The following are SpecLink-E style policy, for consistency.

Inch-Pound Notation:

Fractions: Fractions like "1-3/4 inch" are preferred over decimal fractions, except for very thin dimensions like sheet metal gages. Format fractions with the hyphen.

Spell all Inch-Pound unit names out. This is the least ambiguous method and because Inch-Pound abbreviations are not standardized. Inch-pound abbreviations that may be used are:

  • Horsepower (HP)
  • British thermal unit (Btu)
  • Fahrenheit (F) - use "degree F"
  • Ampere (A)
  • Celsius (C)
  • Farad (F)
  • Giga (G)
  • Henry (H)
  • Joule (J)
  • Kelvin (K)
  • Liter (L)
  • Mega (M)

"Square", "Cubic", etc: Do not abbreviate. Do not use superscripts or symbols. Use "square feet", "cubic yard" etc.

Do not use symbols ( ' or " ) for feet or inches.

Per: Spell out "per" in Inch-Pound notation.

Metric (SI) Notation:

For units less than 1, use decimals.

Because metric unit abbreviations are standardized, abbreviate metric units as shown in the spreadsheet, with the exception given below for superscripts. Metric abbreviations are all lower case, with the following exceptions:

"Square", "Cubic", etc: Abbreviate these as "sq" and "cu" (no period) respectively; e.g., m^2 becomes "sq m".

Per: Use “ / ” for per in metric notation.