📈Big O Notation Calculator

Free Big O Notation Calculator & Reference

Our free Big O notation calculator puts the answers—and the intuition behind them—in one place. Browse a searchable table of common algorithms and data structure operations with their time and space complexity, then compare growth rates visually: plot O(1), O(log n), O(n), O(n log n), O(n²), and more on the same chart to see how dramatically they diverge as input size grows.

Want a concrete number instead of an abstract symbol? Enter a complexity class and an input size, and the tool estimates roughly how many operations that algorithm would perform—making the difference between O(n) and O(n²) tangible rather than theoretical.

Built for computer science students preparing for interviews or exams. No sign-up, no downloads—just a clear reference whenever you need it.