### formulanoun

uk /ˈfɔː.mjə.lə/ us /ˈfɔːr.mjə.lə/ (plural formulas or formulae )#### formula noun (METHOD/RULE)

C1 [C] a standard or accepted way of doing or making something : We have changed the formula of the washing powder. There's no magic formula for success.

› [C] a mathematical rule expressed in a set of numbers and letters: He developed a formula for calculating the area of a triangle.

More examples

- What's the formula for converting pounds into kilos?
- The director has found a winning formula with this film.
- The formula for calculating the cost of each carpet can be found at the back of the catalogue.
- The song-writing duo have stuck rigidly to the successful formula they established with their first hit.
- Different formulae are used to work out the efficiency of these machines.