Complete the Square
Calculate Complete the Square instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Complete the Square
a
b
c
Vertex (x₀)
2
More about: Complete the Square
What it calculates
The “Complete the Square” calculator computes Vertex (x₀) from 3 parameters: a, b, c.
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters a = 1, b = -4, c = 3 the result is 2 (y₀ = -1).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.