Toolbox
Every calculator, grouped by what you are trying to do
Pick a topic, then a tool. Each one shows the method, not just the answer.
Arithmetic & Numbers
Fractions, percentages, factors and primes.
Fraction Calculator
Add, subtract, multiply and divide with simplified steps.
Simplify Fractions Calculator
Reduce any fraction to lowest terms with the GCF shown.
Percentage Calculator
% of a number, what percent, original value and % change.
LCM & GCF Calculator
LCM and GCF of any numbers, by prime factorization.
Prime Factorization Calculator
Factor any number, test for primes and count divisors.
Percentage Change Calculator
Percent increase or decrease between two values.
Times Tables Generator
Any multiplication table, up to 30 lines.
Factorial Calculator
Exact n! up to 1000, with trailing zeros.
Ratio Calculator
Simplify ratios and solve proportions.
Rounding Calculator
Decimal places, significant figures, nearest multiple.
Divisibility Rules Calculator
Test any number against the rules for 2–10.
Factors Calculator
All factors, factor pairs and number type.
Place Value Calculator
Place values and expanded form for any number.
Algebra & Functions
Equations, quadratics and a full scientific calculator.
Scientific Calculator
Brackets, powers, trig and logs — reduced one step at a time.
Quadratic Equation Solver
Discriminant, roots, vertex and factored form with a check.
Linear Equation Solver
Solve for x with variables on both sides, then check it.
Exponent Calculator
Whole, negative and fractional exponents.
Logarithm Calculator
Any base, with change-of-base steps.
Graphing Calculator
Plot y = f(x), find roots and read values.
Statistics & Data
Mean, median, mode, range and standard deviation.
Geometry & Measurement
Right triangles, circles, triangles and solids.
Pythagorean Theorem Calculator
Find a missing side or test for a right angle.
Circle Calculator
Radius, diameter, circumference and area from any one.
Triangle Calculator (Three Sides)
Area, angles and type from three side lengths.
Volume & Surface Area Calculator
Cube, cuboid, cylinder, sphere and cone.
Area Calculator
Rectangle, triangle, parallelogram, trapezoid, ellipse.
Probability & Counting
Permutations, combinations and event probability.
Converters & Notation
Units, number bases, Roman numerals and scientific notation.
Everyday & School Calculators
Discounts, tips, grades, GPA, age, BMI and speed.
Discount Calculator
Sale price, savings, stacked discounts and tax.
Tip Calculator
Tip, total and per-person split.
Speed, Distance & Time Calculator
Solve for speed, distance or time.
Age Calculator
Exact age, total days and next birthday.
BMI Calculator
BMI in metric or imperial units, with the ranges.
GPA Calculator
Weighted GPA from letter grades and credits.
Weighted Grade Calculator
Current weighted grade and score needed on the final.