Fraction Calculator
Reduce, expand, add, subtract, multiply and divide fractions.
Category
Math & School
Rule of three, percentages, grades, conversions, tip
Everyday math, grades and conversions with visible calculation steps.
Good starting point: Rule of three, percentages and fractions – everyday maths done right
GCD and LCM calculator
Calculate the greatest common divisor (GCD) and least common multiple (LCM).
Geometry calculator
Calculate area, perimeter and volume for circle, rectangle, triangle, cylinder and sphere.
Grade point average calculator
Calculate weighted grade point average from multiple subjects or exams.
High school average calculator
Convert total Abitur points into an approximate Abitur grade.
Number base converter
Convert numbers between binary, decimal, octal and hexadecimal.
Percent calculator
Calculate percentage, percentage, base value and percent change.
Prime factorization calculator
Decompose a number into its prime factors and check whether it is prime.
Pythagorean theorem calculator
Calculate the hypotenuse or a missing leg with the Pythagorean theorem.
Quadratic equation solver
Solve quadratic equations with the pq-formula or the quadratic (abc) formula.
Roman numerals converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
Rule of Three Calculator
Solve direct and reverse rule of three with step-by-step calculations.
Temperature converter
Convert Celsius, Fahrenheit and Kelvin directly.
Tip Calculator
Calculate tip, total and share per person directly.
Unit converter
Quickly convert lengths, weights, areas and volumes into each other.