Math & statistics
Scientific calculator, fractions, percentages, rule of three, equations, geometry and statistics.
x = (−b ± √(b² − 4ac))/2aQuadratic Equation Solvera² + b² = c²Pythagorean Theorem CalculatorA = π · r²Circle Area & Circumference CalculatorV = ⁴⁄₃ · π · r³Sphere Volume Calculatorp = part/whole · 100 %Percentage Calculatorδ = (|xmeasured − xtrue|)/|xtrue| · 100 %Percent Error Calculators = √(Σ(xi − x̄)²)/(n − 1)Standard Deviation & Statistics Calculator0.00450 → 3Significant Figures CalculatorΔ% = (Vnew − Vold)/VoldPercentage Change CalculatorA/B = C/XRule of Three Calculator (Proportions)a/b ± c/d = (ad ± bc)/bdFraction Calculatorsin · cos · tan · log · ln · √ · xʸ · n!Scientific CalculatorA = (b · h)/2Triangle Area CalculatorA = l · wRectangle Area & Perimeter CalculatorA = ((a + b) · h)/2Trapezoid Area CalculatorV = π · r² · hCylinder Volume CalculatorV = ⅓ · π · r² · hCone Volume CalculatorV = l · w · hBox Volume Calculator (Rectangular Prism)V = ⅓ · a² · hSquare Pyramid Volume Calculatory = n√xRoot Calculator (Square, Cube, nth Root)y = anExponent Calculator (Powers)y = logb xLogarithm Calculator (Any Base)c² = a² + b² − 2ab · cos γLaw of Cosines Calculatorz = (x − μ)/σZ-Score Calculator (with Percentile)E = z · √(p(1 − p) / n)Margin of Error Calculatorn = n0/(1 + (n0 − 1)/N) · n0 = (z² p(1 − p))/E²Sample Size Calculatormcm(a, b) = |a · b| / mcd(a, b)GCD & LCM Calculatorn = p1a · p2b · …Prime Factorization CalculatorMMXXVI = 2026Roman Numeral Converter25510 = FF16 = 111111112Number Base Converter (Binary, Hex, Octal)0.000123 = 1.23 × 10−4Scientific Notation ConverterC(n, r) = n!/(r! (n − r)!)Permutation & Combination Calculator (nPr, nCr)A = √(s(s − a)(s − b)(s − c))Triangle Calculator from Three Sides (Heron)m = (y2 − y1)/(x2 − x1)Slope, Distance & Midpoint Calculatorx̄ = (Σ wi xi)/(Σ wi)Weighted Average Calculator (Grades)x ∈ [min, max]Random Number Generator