Math and Statistics

  • Logarithm Calculator
    Free logarithm calculator. Compute log base 10, natural log (ln), log base 2, or any custom base using log_b(x) = ln(x)/ln(b). Instant results.
  • Compound Interest Calculator
    Compute compound interest with the formula A = P(1 + r/n)^(nt). Enter principal, rate, compounding frequency and years to find future value and interest.
  • Slope From Equation Calculator
    Find the slope of a line from its standard-form equation Ax + By = C. Enter A, B and C to get slope m = -A/B and the y-intercept instantly.
  • 3×3 System of Equations Calculator
    Solve a 3×3 system of linear equations in x, y, z using Cramer's rule. Enter all 12 coefficients and get the exact solution and determinant instantly.
  • Confidence Interval for a Mean Calculator
    Compute a confidence interval for a population mean using the Student-t distribution. Enter sample mean, standard deviation, size, and confidence level.
  • Projectile Range Calculator
    Calculate the horizontal range of a projectile from launch velocity and angle using R = v²·sin(2θ)/g. Also returns max height and flight time.
  • Speed, Distance & Time Calculator
    Free Speed, Distance & Time calculator. Solve for speed, distance, or time using d = s × t. Supports km, miles, meters, hours, minutes & seconds.
  • Lakhs & Crores to Million / Billion Converter
    Convert lakhs and crores to millions and billions instantly. 1 lakh = 0.1 million, 1 crore = 10 million. See the figure in plain numbers too.
  • Binomial Probability Calculator P(X=k)
    Calculate the exact binomial probability P(X=k) for n trials with success probability p. Free online tool using the binomial formula with worked examples.
  • 3x3 System of Equations Calculator
    Solve a 3x3 system of linear equations using Cramer's Rule. Enter coefficients to find x, y, z plus all determinants instantly.
  • Percent to Decimal & Fraction Calculator
    Convert any percentage to its decimal value and a reduced (simplified) fraction instantly. Free, accurate percent-to-decimal and percent-to-fraction tool.
  • Mixture Problem Calculator
    Solve mixture and concentration blending problems. Combine two solutions of different strengths and find the final concentration, total volume, and solute.
  • Z-Score to Percentile Rank Calculator
    Convert a z-score to a percentile rank using the standard normal distribution. Enter any z value to find the percentage of data below it.
  • Spending as Percent of Income Calculator
    Calculate what percentage of your income goes to a spending category. Enter category spending and total income to see the percent and remaining amount.
  • Independent Events Probability Calculator
    Calculate the probability of two independent events: P(A and B), P(A or B) and P(neither) using the multiplication and addition rules. Free and instant.
  • Completing the Square / Vertex Calculator
    Find the vertex, minimum or maximum of a quadratic ax^2 + bx + c. Computes vertex x = -b/(2a) and the extreme value c - b^2/(4a) instantly.
  • What Percentage Did I Tip?
    Find out what percentage you tipped. Enter your bill and tip amount to instantly calculate the tip percentage and total paid.
  • Quadratic Factoring Calculator
    Factor any quadratic ax²+bx+c into binomial form a(x−r₁)(x−r₂). Enter a, b, c to get the roots, discriminant, and factored expression instantly.
  • Solve for a Variable (Formula Rearranger)
    Solve any linear equation of the form a·x + b = c·x + d for x. Handles unique solutions, identities (all values), and no-solution cases instantly.
  • Simplify Square Root to Radical Form Calculator
    Simplify any square root into simplest radical form a√b. Enter a number to get the coefficient, radicand, and decimal value 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.
  • Linear Equation from a Table of Values Calculator
    Find the linear equation y = mx + b from two points in a table of values. Computes slope and y-intercept instantly with steps.
  • Percent Proportion Solver for X
    Solve the percent proportion part/whole = percent/100 for any unknown. Find the part, the whole, or the percent instantly with steps.
  • Completing the Square: Circle Equation Calculator
    Convert a general circle equation x²+y²+Dx+Ey+F=0 to standard form. Find the center and radius instantly by completing the square.

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