โ๏ธInequality Calculator
Solve linear, quadratic, and compound inequalities with steps, interval notation, and a number line.
Free Inequality Calculator
Solving inequalities is easy to get wrong โ especially remembering to flip the sign. Our free inequality calculator solves linear, quadratic, and compound inequalities and shows every step, with the sign-flip rule called out explicitly whenever you multiply or divide by a negative number.
Type in your inequality and get the solution in both inequality notation and interval notation, plus a visual number line showing exactly which values satisfy it โ with open or closed circles and shading that match the boundary conditions.
For quadratic inequalities, the calculator finds the roots, builds a sign chart across the intervals, and combines them into the correct solution set. Special cases like "no solution" or "all real numbers" are explained in plain English rather than left blank. No sign-up, no downloads, no limits.