Math and Statistics

  • Linear System of 3 Unknowns Solver
    Solve a system of 3 linear equations in 3 unknowns (x, y, z) by Gauss-Jordan elimination. Shows the unique solution and the reduced row echelon form.
  • Quadratic Function Analyzer Calculator
    Analyze any quadratic ax²+bx+c: find the vertex, axis of symmetry, real roots, discriminant, and y-intercept instantly with steps.
  • Square Root of a Negative Number Calculator
    Simplify the square root of a negative number into i·√n form. Enter any number to get the imaginary coefficient instantly with steps.
  • Arctan Calculator
    Enter a tangent value and choose degrees or radians to compute the arctangent (inverse tangent). See the angle in both units with precise results.
  • Percentage Difference Calculator
    Enter two values to calculate percentage difference using the average-based formula, plus the absolute and relative differences, all in one tool.
  • Inverse Tangent Calculator
    Calculate inverse tangent (arctan) with this easy-to-use Inverse Tangent Calculator. Input any number x to find its arctangent value in radians or degrees. Fast, accurate results for trigonometry problems.
  • Slope Percentage Calculator
    Calculate slope percentage easily with this tool. Input rise (vertical distance) and run (horizontal distance) to determine the steepness of an incline. Accurate results for construction, landscaping, and engineering projects.
  • Percent Improvement Calculator
    Calculate percent improvement easily with this free online tool. Enter the original value and new value to determine the percentage of improvement or decline in various scenarios.
  • Permutations Replacement Calculator
    Enter the number of item types (n) and positions to fill (r) to get the count of ordered arrangements with repetition allowed, computed as n^r.
  • Secant Calculator
    Enter an angle in degrees to calculate its secant instantly. See sec(θ) and the angle converted to radians with precise results for trig.
  • Percentage Decrease Calculator
    Find the percent decrease between two numbers instantly. Enter the original and new values to get an exact result with the formula shown — free and easy.
  • Softmax Function Calculator
    Compute the softmax of an input vector online. Converts any list of real numbers into a probability distribution that sums to 1. Numerically stable.
  • Fraction of a Number Calculator
    Find any fraction of a number instantly. Enter the numerator, denominator and number to compute (a/b) × N with this free calculator.
  • What Number Is X% Less Than Y?
    Find what number is X percent less than Y. Enter the percent and the base number to instantly get the reduced value and the amount subtracted.
  • Quadratic Equation Calculator
    Solve any quadratic equation ax²+bx+c=0 instantly. Get real or complex roots and the discriminant using the quadratic formula. Free and accurate.
  • Power Set Calculator
    Compute the power set of any set: get the number of subsets (2^n) and a full list of every subset, including the empty set, instantly.
  • 3D Line Equation From Two Points Calculator
    Find the parametric and symmetric equation of a line in 3D from two points. Get the direction vector, components, and distance instantly.
  • Is-Of Percentage Proportion Calculator
    Solve the percentage proportion is/of = %/100 for any missing value. Enter any two of is, of, or percent and get the third instantly.
  • Binomial Probability Calculator
    Calculate binomial probability P(X=k) with the formula C(n,k)·pᵏ·(1−p)^(n−k). Get exact, cumulative probabilities, mean and standard deviation.
  • Present & Future Value Algebra Calculator
    Solve for present value or future value using FV = PV(1+r)ⁿ. Enter amount, rate per period, and number of periods to get instant results.
  • Scale Factor Calculator for Similar Figures
    Find the scale factor between similar figures, or solve for a missing dimension. Uses k = new ÷ original and new = k × original with area factor k².
  • Solve for Missing Value to Reach a Target Average
    Find the missing value(s) you need to hit a target average. Enter your known numbers, total count, and goal average to solve instantly.
  • Three Numbers in a Ratio Calculator
    Split a total into three parts using a ratio a:b:c. Free share splitter that divides any amount proportionally with a worked example and formula.

Categories