Math calculators

Everyday arithmetic, algebra, and geometry — worked out clearly.

Percentages, fractions, ratios, geometry, and the little calculations that come up all the time — with formulas you can reuse anywhere.

Calculators
244
Topics: All Percentage (75) Fractions (4) Geometry (63)
244 results
Math / Percentage

Percentage Calculator

Solve every common percentage question — "what is X% of Y", "X is what percent of Y", and percentage change.

Featured Trending basic
23,355 4.6 1 min
Math / Fractions

Fraction Calculator

Add, subtract, multiply, and divide fractions — with automatic simplification.

basic
20,434 5.0 1 min
Math / Geometry

Right Triangle Calculator

From the two legs (a, b) of a right triangle, compute the hypotenuse, both acute angles, the area, and the perimeter.

basic
10,132 4.5 1 min
Math / Geometry

Ellipse Perimeter Calculator

Compute the perimeter of an ellipse from its semi-major (a) and semi-minor (b) axes using Ramanujan's second approximati...

basic
18,175 4.8 1 min
Math / Percentage

Mean Calculator

Compute the arithmetic mean (average), along with the median, mode, sum, and range, of any comma-separated list of numbe...

basic
14,774 4.7 1 min
Math / Percentage

Linear Equation Solver

Solve a single linear equation of the form ax + b = c for the unknown x, including a clear "no solution / infinite solut...

basic
11,368 4.3 1 min
Math / Percentage

Prime Number Checker

Check whether any positive integer up to a trillion is prime, and if not, the smallest factor that proves it composite.

basic
6,496 4.6 1 min
Math / Percentage

Prime Factorization Calculator

Factor any positive integer into its prime components and list every divisor and the count of distinct prime factors.

basic
23,376 4.4 1 min
Math / Geometry

Pythagorean Theorem Calculator

Find the hypotenuse from two legs, or recover a missing leg from the hypotenuse and the other leg, using the Pythagorean...

Featured basic
7,325 4.0 1 min
Math / Percentage

Significant Figures Calculator

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientifi...

basic
1,613 4.4 1 min
Math / Geometry

Cross Product Calculator

Compute the cross product (vector product) of two 3-dimensional vectors, plus its magnitude — useful for torque, angular...

basic
1,411 4.8 1 min
Math / Geometry

Distance Between Two Points (2D)

Compute the straight-line distance between two points (x₁, y₁) and (x₂, y₂) in the plane, plus the slope of the line thr...

basic
22,061 4.5 1 min
Math / Percentage

Scientific Notation Converter

Convert numbers between standard decimal form and normalized scientific notation (a × 10ⁿ with 1 ≤ |a| < 10).

basic
5,330 4.1 1 min
Math / Percentage

Percentage Change Calculator

Compute the percentage change from an original value to a new value — positive for an increase, negative for a decrease.

basic
23,602 4.3 1 min
Math / Geometry

Midpoint Calculator

Find the coordinates of the midpoint of the segment connecting two points in the plane.

basic
9,510 3.8 1 min
Math / Geometry

Trigonometry Calculator

Compute sine, cosine, tangent, secant, cosecant, and cotangent of any angle in degrees or radians.

basic
5,200 3.9 1 min
Math / Percentage

Percentage Difference Calculator

Compute the percentage difference between two values using the absolute difference divided by their average — useful whe...

basic
20,766 4.6 1 min