# Quadratic Formula Calculator

> Quadratic formula calculator: solve ax^2+bx+c=0 for real and complex roots plus discriminant and vertex, with worked steps. Free, runs locally, no signup.

- **Canonical URL:** https://boringtoolskit.com/quadratic-formula-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** August 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Roots = (−b ± √(b² − 4ac)) / 2a.

## Sources

- [Calculation methodology and verification standard](/methodology/)

---

*Local planning estimate. Verify current terms, rates, and policies before acting.*