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Math & Conversion Calculators

Free Online Math & Conversion Tools

Explore 67 free math & conversion calculators. Accurate, fast, and mobile-friendly tools for all your calculation needs.

Available Math & Conversion Calculators

  • Percentage Calculator - A fundamental tool for solving the three most common percentage problems: finding the percentage of a number, finding what percentage one number is of another, and finding the total from a percentage.
  • Percentage Change Calculator - Calculates the percentage change (either an increase or decrease) between a starting value and a final value.
  • Percentage Increase Calculator - Specifically calculates the percentage by which a value has increased from an original amount to a new, higher amount.
  • Percentage Decrease Calculator - Specifically calculates the percentage by which a value has decreased from an original amount to a new, lower amount.
  • Percentage Difference Calculator - Calculates the percentage difference between two numbers, useful when there is no clear "original" or "new" value.
  • Fraction to Percent Calculator - Converts a given fraction (e.g., 3/4) into its equivalent percentage value (75%).
  • Decimal to Percent Converter - Converts a given decimal number (e.g., 0.75) into its equivalent percentage value (75%).
  • Average Percentage Calculator - Calculates the mathematical average (mean) of a set of different percentage values.
  • Doubling Time Calculator - Estimates the time it will take for a quantity to double given a constant percentage growth rate.
  • Percentage of a Percentage Calculator - Solves for a percentage of another percentage, useful for layered discounts or compounded effects.
  • Percentage Point Calculator - Calculates the simple arithmetic difference between two percentage values (e.g., 15% - 10% = 5 points).
  • Percent Error Calculator - Measures the difference between an observed value and a true value, expressed as a percentage.
  • Time Percentage Calculator - Calculates what percentage one period of time is of a larger period of time (e.g., 6 hours of a 24-hour day).
  • Percent to Goal Calculator - Measures progress towards a specific goal by calculating what percentage of the goal has been achieved.
  • Relative Change Calculator - Another name for a Percentage Change Calculator; it measures the size of a change in relation to the original value.
  • Slope Percentage Calculator - Converts a slope (rise/run) into a percentage grade, often used for roads, ramps, and land grading.
  • Absolute Value Equation Calculator - Solves equations that contain an absolute value expression, finding the specific value(s) of the variable that make the equation true.
  • Absolute Value Inequalities Calculator - Solves inequalities involving an absolute value expression, finding the range of values that satisfy the inequality.
  • Adding and Subtracting Polynomials Calculator - Simplifies expressions by adding or subtracting polynomials, which involves combining like terms.
  • Bessel Function Calculator - Computes the values of Bessel functions, which are special functions that arise in physics and engineering.
  • Binomial Coefficient Calculator - Calculates the "n choose k" coefficient, representing the number of ways to choose k items from a set of n items.
  • Box Method Calculator - Provides a visual, grid-based method for multiplying polynomials (especially binomials), serving as an alternative to the FOIL method.
  • Completing the Square Calculator - A tool that transforms a quadratic equation from standard form to vertex form by "completing the square".
  • Complex Conjugate Calculator - Finds the conjugate of a complex number (a + bi) by changing the sign of its imaginary part to (a - bi).
  • Complex Number Calculator - Performs basic arithmetic operations like addition, subtraction, multiplication, and division on complex numbers.
  • Complex Root Calculator - Finds the n-th roots of a given complex number using De Moivre’s theorem and lists them in both polar and rectangular form.
  • Cubic Equation Calculator - Finds the real and complex roots (solutions) for a polynomial equation of the third degree.
  • Diamond Problem Calculator - Solves a "diamond puzzle," a teaching tool used to help students practice finding two numbers that multiply and add to given values.
  • Direct Variation Calculator - Solves problems involving direct variation (y = kx), where one variable is a constant multiple of another.
  • Discriminant Calculator - Calculates the discriminant (b² - 4ac) of a quadratic equation to determine the nature of its roots.
  • Elimination Method Calculator - Solves a system of linear equations by algebraically eliminating one variable, making it possible to solve for the other.
  • Error Function Calculator (erf) - Computes the value of the error function, a special function used in probability and statistics.
  • Factoring Trinomials Calculator - Breaks down a trinomial (a three-term polynomial) into the product of two binomials.
  • FOIL Calculator - Multiplies two binomials using the FOIL method, an acronym for First, Outer, Inner, Last.
  • Gamma Function Calculator - Calculates the value of the Gamma function, which extends the factorial function to real and complex numbers.
  • Generic Rectangle Calculator - Another name for the Box Method Calculator, used for visually organizing the multiplication of polynomials.
  • Graphing Inequalities on a Number Line Calculator - Creates a visual representation of the solution to a simple inequality on a number line.
  • Graphing Quadratic Inequalities Calculator - Graphs a quadratic inequality in two variables, showing the parabolic boundary and the shaded solution region.
  • Hyperbolic Functions Calculator - Calculates the values of hyperbolic functions (e.g., sinh, cosh, tanh), which are analogs of trigonometric functions.
  • Inequality to Interval Notation Calculator - Converts a mathematical inequality (e.g., -2 < x ≤ 5) into its corresponding interval notation (e.g., (-2, 5]).
  • Interval Notation Calculator - Performs operations on intervals, such as finding the union or intersection of two or more intervals.
  • Inverse Variation Calculator - Solves problems involving inverse variation (y = k/x), where the product of the two variables is a constant.
  • Multiplying Binomials Calculator - A general tool for finding the product of two binomials, often using the FOIL or Box method.
  • Multiplying Polynomials Calculator - Multiplies two or more polynomials of any degree, combining like terms to provide a simplified result.
  • Partial Fraction Decomposition Calculator - Breaks down a complex rational expression into a sum of simpler fractions, a crucial technique in integral calculus.
  • Perfect Square Trinomial Calculator - Determines if a trinomial is a "perfect square" and, if so, factors it into the square of a single binomial.
  • Polynomial Division Calculator - Divides one polynomial by another, providing the quotient and remainder, using methods like long division or synthetic division.
  • Power Set Calculator - Lists all possible subsets of a given set, including the empty set and the set itself.
  • Quadratic Formula Calculator - Solves a quadratic equation (ax² + bx + c = 0) for its roots by applying the quadratic formula.
  • Quaternion Calculator - Performs arithmetic on quaternions, a number system that extends complex numbers and is used in 3D computer graphics.
  • Rational Zeros Calculator - Applies the Rational Root Theorem to find a list of all possible rational roots for a given polynomial equation.
  • Square of a Binomial Calculator - Expands the square of a binomial, such as (x + y)², into its trinomial form, x² + 2xy + y².
  • Subset Calculator - Determines if one set is a subset of another and can also generate all subsets of a given size from a larger set.
  • Substitution Method Calculator - Solves a system of equations by solving one equation for one variable and substituting it into the other.
  • Synthetic Division Calculator - A simplified shortcut method for dividing a polynomial by a linear binomial of the form (x - c).
  • System of Equations Calculator - Solves a set of two or more equations for the values of the unknown variables that satisfy all equations simultaneously.
  • Union and Intersection Calculator - For two or more sets, this calculator finds their union (all elements combined) and their intersection (only the elements they have in common).
  • Age Calculator - Find your exact age in years, months, and days based on your date of birth.
  • Temperature Converter - Convert temperatures between Celsius (°C) and Fahrenheit (°F).
  • Length Converter - Convert between various units of length (e.g., meters, kilometers, feet, miles).
  • Weight Converter - Convert between various units of weight and mass (e.g., kilograms, pounds, ounces).
  • Volume Converter - Convert between various units of volume (e.g., liters, gallons, cups, tablespoons).
  • Area Converter - Convert between various units of area (e.g., square meters, square feet, acres).
  • Fraction Calculator - Perform addition, subtraction, multiplication, and division on fractions.
  • Random Number Generator - Generate random numbers within a specified range, with or without duplicates.
  • Speed Converter - Convert between various units of speed (e.g., km/h, mph, knots).
  • Data Storage Converter - Convert between units of digital data storage (e.g., KB, MB, GB, TB).

Why Use Our Math & Conversion Calculators?

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