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Polynomial Calculator

Evaluate a polynomial at any value and expand brackets into standard form.

Polynomial calculator

Expanded: —
Value at x: —
Degree: —
Write terms like x^2, 3x or -4, and multiply brackets with an asterisk.

How to use the Polynomial Calculator

  1. Type the polynomial using terms such as x^2, 3x or -4.
  2. Use an asterisk between brackets to multiply them together.
  3. Enter a value of x to evaluate the expanded polynomial at that point.

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Frequently Asked Questions

Common questions about the free online polynomial calculator.

Type terms such as x^2, 3x or -4, and use an asterisk between brackets that you want multiplied.
Write them with an asterisk as (x+1)*(x-2). The expanded form is shown in the result panel.
It means replacing x with a number and working out the value of the whole expression.
It is the highest power of x with a non-zero coefficient, shown in the result panel.
Yes. Coefficients such as -3.5 and constants such as -4 are both accepted.
No. Terms with a coefficient of zero are left out so the expanded answer stays readable.
No. Parsing and evaluation happen locally in your browser and nothing is sent anywhere.
The tool shows a short check message instead of a wrong answer, so you can correct the input.
Yes. The calculator is fully responsive and works on phone, tablet and desktop.
Yes. It is completely free and unlimited, with no account or sign-up required.

Last updated: October 10, 2026