# calculus

> English word · Noun · IPA /ˈkæl.kjʊ.ləs/ · frequency rank #12,930

## Definitions
1. Calculation; computation.
2. Any formal system in which symbolic expressions are manipulated according to fixed rules.
3. Differential calculus and integral calculus considered as a single subject.
4. A stony concretion that forms in a bodily organ.
5. Deposits of calcium phosphate salts on teeth.
6. A decision-making method, especially one appropriate for a specialised realm.

## Etymology
* Borrowed from Latin calculus (“a pebble or stone used as reckoning counters in abacus”), diminutive of calx (“limestone”) + -ulus.
* Mathematical topic is from differential calculus.

## Easily confused with
- **callus** (https://plainspell.com/en/vs/calculus-vs-callus)

## Common misspellings (12)
`aclculus`, `caclulus`, `calcculus`, `calcluus`, `calcullus`, `calculsu`, `calculuss`, `calcuuls`, `callculus`, `caluclus`, `ccalculus`, `claculus`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/calculus