Power Calculators

x= Axis of Symmetry Calculator

Calculate the axis of symmetry of a quadratic y = ax² + bx + c.

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Enter details

Axis of symmetry x
2

Also available in our Android app, with charts and full breakdown tables.

📘 About the Axis of Symmetry

Calculate the vertical symmetry line of a parabola.

🧮 Formula

Where

  • a,b = quadratic coefficients
x = -b/(2a).

✏️ Worked example

2x² - 8x + 3

You enter
a2
b-8
You get
Axis of symmetry x2

The axis is x = 2.

Try this example →

🧭 How to use this calculator

What you enter

  • a
  • b

What you get

  • Axis of symmetry x

💡 Use

  • The axis passes through the vertex.
  • a must be non-zero.

❓ Frequently asked questions

Does c affect the axis?

No. The axis depends on a and b only.