Online Math Tools

BrushCue offers a growing set of free math and calculation tools that run entirely in your browser.

Geometry

These tools solve common geometry calculations.

Calculate the length of a right triangle's hypotenuse from its two other side lengths using the Pythagorean theorem.

Calculate the area of a square from its side length with this free online calculator. Enter one side to get the area using side², useful for tiling, flooring, and geometry homework.

Rectangle Area

Calculate the area of a rectangle from its width and height with this free online calculator. Enter both sides to get the area instantly, useful for rooms, walls, paint estimates, and geometry homework.

Triangle Area

Calculate the area of a triangle from its base and height with this free online calculator. Enter both values to get the area using ½ × base × height, useful for gables, sails, and geometry homework.

Parallelogram Area

Calculate the area of a parallelogram from its base and height with this free online calculator. Enter the base and vertical height to get the area using base × height for geometry and drafting.

Trapezoid Area

Calculate the area of a trapezoid from its two parallel bases and height with this free online calculator. Uses (a + b) / 2 × height, useful for land plots, roof sections, and geometry homework.

Circle Area

Calculate the area of a circle from its radius with this free online calculator. Enter the radius to get the area using π × r², useful for geometry homework, garden beds, and round tables.

Ellipse Area

Calculate the area of an ellipse from its semi-major and semi-minor axes with this free online calculator. Enter both axes to get the area using π × a × b for oval rugs, tables, and orbits.

Arithmetic

These tools perform common arithmetic and number theory calculations.

Factorial

Calculate the factorial of a non-negative integer — the product of all positive integers up to that number.

Trigonometry

These tools convert between angle units and solve common trigonometry calculations.

Degrees to Radians

Convert degrees to radians instantly with this free online converter. Enter an angle in degrees to get radians using degrees × π / 180, handy for trigonometry, programming, and physics.

Radians to Degrees

Convert radians to degrees instantly with this free online converter. Enter an angle in radians to get degrees using radians × 180 / π, handy for reading results from code, calculus, and physics.

Sine (Degrees)

Calculate the sine of an angle in degrees with this free online sine calculator. Enter an angle like 30° to get its sine instantly, useful for right-triangle problems, trigonometry homework, and checking work.

Sine (Radians)

Calculate the sine of an angle in radians with this free online sine calculator. Enter an angle like π/6 to get its sine instantly, useful for calculus, wave and physics problems, and programming.

Cosine (Degrees)

Calculate the cosine of an angle in degrees with this free online cosine calculator. Enter an angle like 60° to get its cosine instantly, useful for right-triangle problems, vectors, and trigonometry homework.

Cosine (Radians)

Calculate the cosine of an angle in radians with this free online cosine calculator. Enter an angle like π/3 to get its cosine instantly, useful for calculus, rotations, oscillation problems, and programming.