Calculators

Small, client-side tools for exploring ideas. No accounts, no server math — your browser does the work. Educational estimates only.

Estimate f′(x₀) with forward, backward, or central differences.

Solve ax²+bx+c=0 with discriminant and real or complex roots.

Determinant, inverse, and products AB / BA for two matrices.

Characteristic polynomial roots for a 2×2 matrix.

Dot product, cross product, magnitude, and unit vectors.

n choose k and P(X=k) for a binomial model.

Approximate Φ(z) or invert a percentile to a z-score.

Permutations, combinations, and factorials with overflow warnings.

Nth term and finite sum for arithmetic or geometric progressions.

Sample f(x) as x→a or ±∞ with a constrained expression parser.

Left, midpoint, or right rectangular sums on [a,b].