Example: a: 1 · b: -3 · c: 2 → x = 2 or 1: two real roots.
Discriminant: 1
Vertex: (1.5, -0.25)
Frequently asked questions
How do I calculate quadratic formula? Enter your numbers above and the result updates instantly. For example: a: 1 · b: -3 · c: 2 → x = 2 or 1: two real roots.
Is this Quadratic Formula Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for quadratic formula. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.