Arithmetic & Numbers
Percentage Calculator
Calculate percentages, percentage differences, and relative growth rates instantly.
Grade Calculator
Weighted course grades, the score needed on a final, and letter grades.
Average Calculator
Compute mean, median, mode, and range for any custom data series.
Fraction Calculator
Add, subtract, multiply, divide, and simplify common and mixed fractions.
Exponent Calculator
Solve powers, base exponents, negative exponents, and scientific roots.
Square Root Calculator
Calculate square roots, cube roots, and custom nth roots with high precision.
Rounding Calculator
Round numbers to tenths, hundredths, thousandths, or custom decimals.
GCF & LCM Calculator
Find greatest common factors and least common multiples for number sets.
Prime Number Checker
Test whether an integer is prime and view full prime factorization trees.
Scientific Notation
Convert between standard format, scientific notation, and engineering notation.
Random Number Generator
Generate cryptographically secure random integers or decimals across any range.
Algebra & Geometry
Quadratic Formula
Solve quadratic equations ax2 + bx + c = 0 with real and complex roots.
Pythagorean Theorem
Compute side lengths, hypotenuse, and perimeter of right-angled triangles.
Area Calculator
Calculate exact area and perimeter for circles, triangles, trapezoids, and rectangles.
Trigonometry Calculator
Evaluate sin, cos, tan, and inverse functions in degree or radian coordinates.
Statistics Calculator
Calculate sample variance, standard deviation, population dispersion, and quartiles.
Roman Numerals
Bidirectional conversion between Roman numeral numerals and standard integers (1 to 3999).