Math and Statistics

  • Effective Annual Rate (APY) Calculator
    Convert a nominal annual interest rate into the effective annual rate (APY) using the compounding formula APY = (1 + r/n)^n − 1.
  • Round to Nearest 10/100/1000 Calculator
    Round any number to the nearest 10, 100, 1000 or decimal place. Free rounding calculator showing the result and how far it shifted from the original.
  • Argument of a Complex Number Calculator
    Find the argument (phase angle) of a complex number a+bi in radians and degrees using arg(z)=atan2(b,a). Also returns the modulus |z|.
  • Sales Tax Calculator
    Calculate sales tax and total price instantly. Enter a price and tax rate (%) to get the tax amount and final total. Free, fast, and accurate.
  • Slant (Oblique) Asymptote Calculator
    Find the slant (oblique) asymptote y = mx + c of a rational function by polynomial long division. Enter quadratic numerator and linear denominator coefficients.
  • Even or Odd Function Calculator
    Determine whether a power function f(x) = a·x^p is even, odd, or neither by comparing f(-x) with f(x) and -f(x). Free symmetry checker.
  • Logistic Growth Model Calculator
    Compute logistic population growth P(t) = K / (1 + A e^-rt) from carrying capacity, initial size, growth rate and time. Free, instant, with formula.
  • Complex Fraction Simplifier Calculator
    Simplify a complex fraction (a fraction divided by a fraction) instantly. Enter a/b over c/d to get the reduced fraction and decimal value.
  • Multiplying and Dividing Fractions with Variables Calculator
    Multiply or divide two fractions (rational expressions) by their coefficients and get the simplified, reduced result plus a decimal value instantly.
  • Add & Subtract Rational Expressions Calculator
    Add or subtract two fractions a/b ± c/d, get the combined fraction, simplify it by the greatest common factor, and see the decimal value instantly.
  • Three Variable Percent Equation Solver
    Solve the percent proportion part/whole = percent/100 for any unknown. Enter two values, pick what to solve for, and get the part, whole, or percent instantly.
  • Point-Slope Form Calculator
    Build the equation of a line from a slope and a point. Get point-slope form y − y₁ = m(x − x₁) and convert to slope-intercept y = mx + b instantly.
  • Percent of Increase or Decrease Calculator
    Find the percent of increase or decrease between two values. Enter the original and new amount to get the percent change instantly with steps.
  • Summation (Sigma) Notation Evaluator
    Evaluate sigma (Σ) summation notation online. Enter f(i), lower and upper limits, and get the exact termwise sum plus first and last terms.
  • Compound Annual Growth Rate (Algebraic) Calculator
    Calculate Compound Annual Growth Rate (CAGR) from a beginning value, ending value, and number of years using the algebraic CAGR formula.
  • Complete the Square to Find Circle Center & Radius
    Convert the general circle equation x²+y²+Dx+Ey+F=0 to standard form. Instantly find the center (−D/2, −E/2) and radius by completing the square.
  • Unit Vector (Normalize) Calculator
    Normalize a 2D or 3D vector to a unit vector. Enter X, Y, and optional Z components to get the magnitude and the unit vector û = a / |a|.
  • Solve for Needed Score Calculator
    Find the exact score you need on a remaining assignment or final exam to reach your target weighted overall grade. Solve for the required grade fast.
  • Unit Rate Calculator
    Find the unit rate fast: divide a total quantity by the number of units. Get price per item, miles per hour, cost per kg and more instantly.
  • Ratio Sharing Calculator
    Split any total amount into three shares using a ratio a:b:c. Free ratio sharing calculator with instant results and a worked formula example.
  • Quadratic Vertex Coordinates Calculator
    Find the vertex (h, k) of any quadratic y = ax^2 + bx + c instantly. Uses h = -b/(2a) and k = c - b^2/(4a) with worked examples.
  • Common Difference Calculator
    Find the common difference d of an arithmetic sequence from any two terms. Enter the first term, a later term, and its position to compute d instantly.
  • Convert Between Radical and Exponential Form
    Convert exponential form to radical form (and back) and evaluate x^(m/n). Enter base, numerator and denominator to get the nth root of x^m instantly.
  • Reduced Row Echelon Form (RREF) Calculator
    Free RREF calculator. Reduce any matrix (up to 6x6) to reduced row echelon form using Gauss-Jordan elimination and find the matrix rank instantly.

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