Vertex Form Calculator

Choose the equation form and enter the values of a, b, and c in the vertex form calculator to find vertex and y-intercept.


Vertex form

a(x - h)² + k

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Vertex Form Calculator 

The vertex form calculator is used to find the vertex and y-intercept for a parabola. You can find the vertex for a standard quadratic form and vertex form of a parabola.

What is a vertex?

A vertex is the intersection point of the x and y coordinates of a parabola. It is the extremal point on its graph. It can be a minimum or maximum point.

The point is generally written as p(h,k). Here h is the x-coordinate and k is the y-coordinate.

Vertex formula:

Vertex is calculated from two types of equations: standard and vertex form. 

For standard form (y = ax2 + bx + c):

h = -2b/a

k = c - b2/(4a)

(Alternatively, you can convert standard form into vertex form to identify the values.)

For vertex form (y = a*(x-h)2 + k) :

Simply identify h and k

How to calculate the vertex of a parabola?


Find the vertex for the equation:

y = 3x2 + 2x + 5


Step 1: Complete the square:

y = x2 + 2x + 5

y - 5 + 1 = x2 + 2x +1 (Adding 1 to the both sides)

y - 4 = (x + 1)2

y = (x + 1)2 + 4

Now it is in vertex form.

Step 2: Identify h and k: