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Completing the Square Calculator

Free Online Tool

Use this calculator to complete the square for any quadratic expression. Enter any valid number, including fractions into the text boxes and our calculator will perform all work, while you type! If you are interested in learning more about completing the square or in practicing common problem types for completing the square, please check out our lesson on this topic.

$ \red{A}x^2 + \blue{b}x + \blacksquare $

Enter only numbers, decimal or "/" for fractions into the calculator.
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How To Use: Just enter any numbers for A and for B. You can write fractions with slashes such as '1/3' or '1/6'


$ \color{red}{A}x^2 + \color{red}{b}x + \blacksquare $

$$ $$
Back to All Calculated Problems Next to Completing Square Lesson