What does the Quadratic Formula Calculator work out?

Roots of ax^2 + bx + c = 0, including complex ones. It is one of the Math tools on Mondo Knows.

How is the Quadratic Formula Calculator calculated?

The maths is short enough to check by hand: x = (-b +/- sqrt(b^2 - 4ac)) / 2a.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Quadratic Formula Calculator

Roots of ax^2 + bx + c = 0, including complex ones. Use the free quadratic formula calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Mondo says

Root 1

2

Root 21

Discriminant1

Vertex x1.5

The formula

x = (-b +/- sqrt(b^2 - 4ac)) / 2a

Quadratic Formula Calculator: common questions

What does the Quadratic Formula Calculator work out?: Roots of ax^2 + bx + c = 0, including complex ones. It is one of the Math tools on Mondo Knows.
How is the Quadratic Formula Calculator calculated?: The maths is short enough to check by hand: x = (-b +/- sqrt(b^2 - 4ac)) / 2a.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.