Concrete
Calculator

Solve ax² + bx + c = 0 instantly. Get roots, discriminant, vertex, axis of symmetry, and a live parabola graph.

Calculate simple and compound interest on savings and investments with yearly breakdown.

Calculate speed, distance, or time given the other two values with multiple unit conversions.

Convert between binary, octal, decimal, and hex. Perform arithmetic in any base with 32-bit two's complement support.

Calculate percentages four ways: X% of Y, what percent X is of Y, X is Y% of what, and percentage change.

Generate cryptographically random numbers with custom range, count, and duplicate controls.