Plural of Formula
The Quick AnswerThe plural of formula is formulas or formulae.
The Plural of FormulaThe plural of formula is formulas or formulae.
- Formulas are applied to provide a mathematical solution for real world problems.
- Formulae are used to express relationships between various quantities.
The table below shows the standard rules for forming the plurals of nouns in English.
|Type||Example of Type||Forming the Plural||Plural|
|Most Nouns|| formula
|add s|| formulas
|Noun Ending s, sh, ch, x or z|| box
|add es|| boxes
|Nouns ending [consonant] o|| hero
|add either s or es
(There are no rules for this - you have to know.)
|Nouns ending [vowel] o|| patio
|add s|| patios
|Nouns ending [consonant] y|| story
|change the y to an i and add es|| stories
|Nouns ending [vowel] y|| donkey
|add s|| donkeys
|Nouns ending f or fe|| dwarf
|ves and/or s
(There are no rules - you have to know.)
hooves or hoofs
|some nouns undergo a vowel or letters change|| men
|More exceptions|| salmon
|some nouns do not change at all|| salmon
|Foreign rulings|| formula
|some nouns adopt foreign rulings|| formulae
Why Is There Confusion over the Plural of Formula?Confusion arises over the plural of formula because its original plural form (formulae) derives from Latin, and native English speakers are drawn to formulas, which adheres to the standard ruling for forming plurals.
Both formulae and formulas are acceptable, but formulas is the more common plural and the safest option. (See the evidence in Google's Ngram Viewer.)