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Inequality Solver

Solve a linear inequality and see the solution as an inequality and as an interval.

Solve an inequality

Solution: —
Interval: —
The input form is a times x plus b compared with c. Graph the interval on a number line.

How to use the Inequality Solver

  1. Enter the coefficient of x and the constant term on the left.
  2. Choose the comparison sign from less than to greater than or equal to.
  3. Enter the value on the right to see the solution and its interval.

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Frequently Asked Questions

Common questions about the free online inequality solver.

Enter the coefficient of x, the constant term and the right hand side, then pick the comparison sign.
It flips whenever you multiply or divide both sides by a negative number, which the tool does for you.
It shows the same solution on a number line, with a closed dot for inclusive bounds and an open dot otherwise.
The inequality then no longer contains x, so it is either true for every value or false for every value.
No. A strict less than sign excludes the boundary, while less than or equal to includes it.
Yes. Negative and decimal values work in every box, including the coefficient of x.
It means the solution continues without bound in that direction, so there is no endpoint there.
No. Solving happens locally in your browser and nothing you type is ever sent anywhere.
Yes. The solver 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