Math calculators
Algebra Calculators
11 tools
Quadratic formula, linear ax + b = rhs, inequalities, and polynomial roots. Equation Workspace composes those engines with one nonlinear root and small Ax=b. Matrix tools live on Linear Algebra. Tools may appear in more than one topic.
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All Algebra & Equations
Every live calculator in this family. URLs stay /calc/math/…
- Absolute Value Calculator Solve |ax + b| = rhs. Same engine as Linear Equation. Two solutions when rhs > 0; empty when rhs < 0. Not quadratic. Not a second engine. Not CAS. Runs locally.
- Absolute Value Inequality Calculator Solve |ax + b| ○ rhs for ○ in {<, ≤, >, ≥}. Same engine as Linear Equation. Inside the branches is an interval; outside is a union. Not quadratic. Not a second engine. Not CAS. Runs locally.
- Cubic Equation Calculator Cardano / trigonometric closed form for a real cubic. Same engine as Polynomial Roots. Three real roots or one real plus a conjugate pair. Not Ferrari. Not a second cubic engine. Runs locally.
- Linear Equation Calculator Solve ax + b = rhs for x. Identity and inconsistent cases when a = 0. Inequality /linear-inequality. Absolute value /absolute-value. Not the quadratic formula. Runs locally.
- Linear Inequality Calculator Solve ax + b ○ rhs for ○ in {<, ≤, >, ≥}. Same engine as Linear Equation. Negative a flips the inequality. Not quadratic. Not a second engine. Runs locally.
- Polynomial Evaluate Calculator Horner nested multiplication for a real polynomial at a real x. Same engine as Polynomial Roots. Not factoring. Not a second engine. Not CAS. Runs locally.
- Polynomial Roots Calculator Find all roots of a real polynomial of degree 1–8. Closed form for linear, quadratic, and cubic (Cardano); Durand–Kerner otherwise. Cubic discovery /cubic-equation. Horner evaluation /polynomial-evaluate. Not the quadratic formula page. Runs locally.
- Quadratic Formula Calculator Solve ax² + bx + c = 0 with the quadratic formula. Inequality discovery /quadratic-inequality. Free online tool — no sign-up. Clear formulas and worked examples. Runs locally in your browser.
- Quadratic Inequality Calculator Solve ax² + bx + c ○ rhs for ○ in {<, ≤, >, ≥}. Same engine as Quadratic. Sign of a is the outside of the roots. Not cubic. Not a second engine. Not CAS. Runs locally.
- Rational Equation Calculator Solve (ax + b)/(cx + d) = rhs. Same engine as Linear Equation. Clears to linear; the pole x = −d/c is excluded. Not quadratic. Not a second engine. Not CAS. Runs locally.
- Rational Inequality Calculator Solve (ax + b)/(cx + d) ○ rhs for ○ in {<, ≤, >, ≥}. Same engine as Linear Equation. Sign chart of N·D; the pole is excluded. Not quadratic. Not a second engine. Not CAS. Runs locally.