FormulaCalcKit - Free Online Math, Science & Geometry Calculators (公式工具箱)

FormulaCalcKit provides high-precision mathematical, geometric, and physics calculators with step-by-step solutions, exact radical forms, and interactive visualization tools.

Featured Calculators & Tools / 精选公式计算器矩阵

Quadratic Equation Solver | 一元二次方程求根计算器 - Solve ax² + bx + c = 0 with discriminant Δ, factoring, and parabola graphing.
Pythagorean Theorem Calculator | 勾股定理计算器 - Solve right triangle hypotenuse a² + b² = c² with simplified radicals.
Sector Area & Arc Length Calculator | 扇形面积与弧长计算器 - Compute sector area S=(n/360)πr², arc length l=(n/180)πr, and central angle.
Linear Function & Line Equation Calculator | 一次函数解析式生成器 - Two points line equation y=kx+b and interactive graph.
Linear System Solver (2x2) | 二元一次方程组求解器 - Step-by-step 2x2 linear system solver with substitution & elimination methods.