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Formulas vs. Formulae

Formulas

Rules or methods for doing calculations or solving problems, often expressed in symbols

Examples:

Synonyms:

Antonyms:

Formulae

A set of instructions or steps to achieve a result, often in math or science

Examples:

Synonyms:

Antonyms:

Ways to tell them apart:

Both words refer to mathematical or scientific expressions or a set of symbols that express a fact, rule, or principle.
Formulas is often used in American English to refer to more than one formula, particularly in non-technical contexts.
Formulae is the classical Latin-derived plural form and is more commonly used in formal or technical contexts, especially in British English.
To differentiate, remember that formulas aligns with the typical English pluralization pattern, whereas formulae retains its classical roots in Latin.
Think about formulae as fitting in with words like alumni and cacti which maintain their Latin plural forms.

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