Find both real or complex roots of ax² + bx + c = 0.
Enable JavaScript to enter your own values and calculate in your browser. Your inputs are not sent to a server.
Uses the quadratic formula with a cancellation-resistant calculation for real roots.
Using the example inputs, first root is 3.
Uses your inputs only; results are rounded for display.
OpenStax mathematics
Polynomial evaluation
Polynomial calculus
Quadratic graph
Linear equation solver
Two-equation system
BUILT FOR CLARITY
An original collection of calculators for everyday estimates and learning.
Calculations run in your browser. This site does not send your inputs to a server or serve advertising. Optional analytics runs only after you allow it. Results are estimates within each tool’s stated scope, not professional advice.
Financial, health and building-related tools have specific limitations. Check important decisions with a qualified professional. No live currency rates, tax tables or current price feeds are connected.