Percentages & Ratios13
Percentage Calculator
I want to find, Percentage (X) → Result, What this means, Working
Ratio Calculator
Part A, Part B → Simplified A/B, A ÷ B, What this means
Decimal to Fraction Calculator
Decimal, Max Denominator → Best Fraction, Check Decimal, What this means
Fraction to Decimal Calculator
Numerator, Denominator → Decimal, As Percent, What this means
Percentage Change Calculator
Original Value, New Value → Percent Change, Absolute Change, Direction
Percentage Increase Calculator
Original Value, Increase % → New Value, Amount Added, What this means
Percentage Decrease Calculator
Original Value, Decrease % → New Value, Amount Subtracted, What this means
Percentage Difference Calculator
Value A, Value B → Percent Difference, |A − B|, What this means
Percentage of Calculator
I want to find, Percentage (X) → Result, What this means, Working
What Percent Calculator
Part (X), Whole (Y) → Percent, What this means
Ratio Simplifier
Part A, Part B → Simplified A/B, A ÷ B, What this means
Proportion Calculator
A, B → D (missing term), What this means
Scale Calculator
Real Length, Scale (1 : N) → Drawing Length, What this means
Algebra & Equations14
Equation Solver
Equation Type, a (in ax + b = c) → Solution / Root 1, Root 2 (quadratic only), Discriminant b²−4ac (quadratic only)
Matrix Calculator
A₁₁, A₁₂ → A × B, What this means
Determinant Calculator
a₁₁, a₁₂ → Determinant, What this means
Factorial Calculator
n (0 to 170) → n!, What this means
Quadratic Equation Solver
a (x² coeff), b (x coeff) → Root 1, Root 2, Discriminant b²−4ac
Linear Equation Solver
a (in ax + b = c), b → x, What this means
Polynomial Calculator
Coefficients high→low (comma-separated), Evaluate at x → P(x), Degree, What this means
Exponent Calculator
Base, Exponent → Result, What this means
Root Calculator
Number, Root Degree → Root, What this means
Square Root Calculator
Number → √n, What this means
Cube Root Calculator
Number → ∛n, What this means
Power Calculator
Base, Exponent → Result, What this means
Simplify Fraction Calculator
Numerator, Denominator → Simplified, GCD Used, Decimal
Vector Calculator
Vector A: x, Vector A: y → A + B, |A|, |B|
Geometry & Trigonometry22
Area Calculator
Shape, Length → Area, Perimeter / Circumference (bonus), What this means
Perimeter Calculator
Shape, Length → Perimeter / Circumference, Area (bonus), What this means
Volume Calculator
Solid, Side → Volume, Surface Area (bonus), What this means
Surface Area Calculator
Solid, Side → Surface Area, Volume (bonus), What this means
Pythagorean Theorem Calculator
Leg a, Leg b → Hypotenuse c, What this means
Triangle Calculator
Side a, Side b → Area, Perimeter, Semi-perimeter
Circle Calculator
Radius → Area, Circumference, Diameter
Rectangle Calculator
Length, Width → Area, Perimeter, Diagonal
Square Calculator
Side → Area, Perimeter, Diagonal
Parallelogram Calculator
Base, Height → Area, Perimeter, What this means
Trapezoid Calculator
Base a, Base b → Area, What this means
Rhombus Calculator
Diagonal 1, Diagonal 2 → Area, Side, Perimeter
Ellipse Calculator
Semi-major a, Semi-minor b → Area, Perimeter (approx), What this means
Sphere Calculator
Radius → Volume, Surface Area, What this means
Cylinder Calculator
Radius, Height → Volume, Surface Area, What this means
Cone Calculator
Radius, Height → Volume, Surface Area, Slant Height
Pyramid Calculator
Base Area, Height → Volume, What this means
Cube Calculator
Side → Volume, Surface Area, What this means
Prism Calculator
Base Area, Length / Height → Volume, What this means
Angle Calculator
Angle A (°), Angle B (°) → Angle C (°), Sum Check, What this means
Trigonometry Calculator
Angle, Unit → sin, cos, tan
Inverse Trig Calculator
Value, Function → Degrees, Radians, What this means
Fractions & Arithmetic22
Fraction Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Simplified Fraction, Decimal, What this means
Mean Calculator
Numbers (comma-separated) → Mean, Sum, Count
Median Calculator
Numbers (comma-separated) → Median, What this means
Mode Calculator
Numbers (comma-separated) → Mode, What this means
Prime Number Checker
Number → Result, Number, What this means
GCD Calculator
First Number, Second Number → GCD, What this means
LCM Calculator
First Number, Second Number → LCM, What this means
Scientific Calculator
Expression (use +, -, *, /, %, ^, sqrt, sin, cos, tan, log, ln, pi, e) → Result, What this means
Modulo Calculator
Dividend, Divisor → Remainder, Quotient, What this means
Rounding Calculator
Number, Decimal Places → Rounded, Floor, Ceil
Significant Figures Calculator
Number, Significant Figures → Rounded (sig figs), What this means
Mixed Number Calculator
Whole Number, Numerator → Improper / Simplified, Decimal, What this means
Improper Fraction Calculator
Numerator, Denominator → Mixed Number, Decimal, What this means
Compare Fractions Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Comparison, Fraction 1 (decimal), Fraction 2 (decimal)
Add Fractions Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Simplified Fraction, Decimal, What this means
Subtract Fractions Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Simplified Fraction, Decimal, What this means
Multiply Fractions Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Simplified Fraction, Decimal, What this means
Divide Fractions Calculator
Fraction 1: Numerator, Fraction 1: Denominator → Simplified Fraction, Decimal, What this means
Average Calculator
Numbers (comma-separated) → Mean, Sum, Count
Weighted Average Calculator
Values (comma-separated), Weights (comma-separated) → Weighted Average, What this means
Geometric Mean Calculator
Positive numbers (comma-separated) → Geometric Mean, What this means
Harmonic Mean Calculator
Non-zero numbers (comma-separated) → Harmonic Mean, What this means
Probability & Statistics16
Statistics Calculator
Numbers (comma-separated) → Mean, Median, Mode
Standard Deviation Calculator
Numbers (comma-separated) → Sample Std Dev, Sample Variance, Mean
Probability Calculator
Favorable Outcomes, Total Outcomes → Probability, Percent Chance, Odds (fav:against)
Variance Calculator
Numbers (comma-separated) → Sample Variance, Sample Std Dev, What this means
Z-Score Calculator
Value x, Mean μ → z-score, What this means
Confidence Interval Calculator
Sample Mean, Sample Std Dev → Lower Bound, Upper Bound, Margin of Error
Sample Size Calculator
z Critical, Estimated Proportion p → Sample Size (ceil), What this means
Correlation Calculator
X values (comma-separated), Y values (comma-separated) → Pearson r, What this means
Regression Calculator
X values (comma-separated), Y values (comma-separated) → Slope (m), Intercept (b), What this means
Permutation Calculator
n, r → P(n,r), What this means
Combination Calculator
n, r → C(n,r), What this means
Binomial Probability Calculator
Trials n, Successes k → P(X = k), Percent, What this means
Normal Distribution Calculator
x, Mean μ → PDF f(x), CDF P(X≤x), z
Random Number Generator
Minimum, Maximum → Random Number, What this means
Dice Probability Calculator
Sides per Die, Number of Dice → Probability, Favorable, Total Outcomes
Coin Flip Probability Calculator
Number of Flips, Desired Heads → Probability, Combinations, What this means
More math tools13
Algebra Solver
Equation Type, a (in ax + b = c) → Solution / Root 1, Root 2 (quadratic only), Discriminant b²−4ac (quadratic only)
Log Calculator
Number (argument), Base → log_base(n), ln(n), log10(n)
Absolute Value Calculator
Number → |n|, What this means
Range Calculator
Numbers (comma-separated) → Range, Min, Max
Degree to Radian Calculator
Degrees → Radians, What this means
Radian to Degree Calculator
Radians → Degrees, What this means
Sin Calculator
Angle, Unit → sin(θ), What this means
Cos Calculator
Angle, Unit → cos(θ), What this means
Tan Calculator
Angle, Unit → tan(θ), What this means
Dot Product Calculator
Aₓ, Aᵧ → Dot Product, What this means
Cross Product Calculator
Aₓ, Aᵧ → A × B, What this means
Complex Number Calculator
Real part a, Imag part b → Modulus |z|, Argument (°), Conjugate
Sequence Calculator
First Term a₁, Common Difference d → aₙ, Sum Sₙ, What this means
What the math tools cover
The math section runs from arithmetic to introductory statistics. Percentages and ratios (percentage, ratio, fractions), geometry (area, volume, triangles, circles), algebra (quadratic equations, linear equations, matrices), number theory (GCD, LCM, primes, factorials) and statistics (mean, median, standard deviation, probability).
The point of most of these pages is the working, not the answer. A quadratic solver that prints the discriminant tells you why there are two roots, one root or none. A fraction calculator that shows the common denominator is more use for homework than one that only prints the result. Where a formula has a well-known trap, such as confusing radius with diameter or adding percentages of different bases, the page says so.
Limits worth knowing
- JavaScript arithmetic is double precision, so results are exact to about 15 significant digits. Factorials stop at 170 because 171! overflows.
- Displayed values are rounded. The calculation underneath keeps full precision until the final step.
- Angle-based tools state whether they expect degrees or radians. Getting that wrong is the single most common trigonometry error.
Multi-mode tools such as the area and volume calculators reuse the formulas from the dedicated shape pages rather than reimplementing them, so a fix in one place applies everywhere.