Math Calculators

Free online math calculators for the problems students, engineers, and professionals actually encounter. Every tool shows the work, not just the answer. If you need to check a calculation, learn a method, or run the same operation a hundred times fast, these are built for that.

What you can do here

Everyday math

The Fraction Calculator adds, subtracts, multiplies, and divides fractions, returning both simplified fraction and decimal equivalent. The Percentage Calculator handles every common question in one tool: “what is X% of Y”, “X is what % of Y”, and before-and-after. The Percentage Change Calculator specializes in the before-and-after case with signed output so increase versus decrease is unambiguous.

Roots, powers, and averages

The Square Root Calculator handles any real number to multiple decimal precision, including non-perfect squares. The Exponent Calculator raises any base to any power, including negative and fractional exponents. The Average/Mean Calculator takes a list of numbers and returns arithmetic mean, median, and mode in one pass.

Statistics and algebra

The Standard Deviation Calculator returns both population and sample SD, variance, and the step-by-step calculation for verification. The Quadratic Equation Solver solves ax² + bx + c = 0 for real and complex roots, and shows the discriminant so you understand why an equation has one, two, or no real solutions.

Geometry and scientific

The Triangle Calculator solves any triangle given three pieces of information using the law of sines and law of cosines. The Scientific Calculator is a full-featured calculator with trig (degrees or radians), logarithms, exponentials, parentheses, memory, and history of the last five operations. Works on mobile and keyboard.

Why show the working

Most calculator sites give you the answer and stop. Ours show the formula, the substituted values, and the step-by-step simplification. If you are a student, this is how you learn. If you are a professional, this is how you verify the tool agrees with the textbook before you trust the answer.

Frequently asked questions

Which calculator handles mixed numbers?

The Fraction Calculator accepts mixed number input (like “2 1/3”) and returns mixed number output when the result is greater than one.

Can the Scientific Calculator be used on mobile?

Yes. The buttons are sized for touch input and the layout reflows to a single column on narrow screens.