Trigonometry Calculator

  • Degrees Minutes Seconds Calculator
    Convert degrees, minutes and seconds (DMS) to decimal degrees and radians instantly. Free online angle/coordinate converter with worked examples.
  • Oblique Triangle Calculator
    Solve any oblique (non-right) triangle from 3 known parts using the law of sines and law of cosines. Find missing sides, angles, perimeter and area.
  • Obtuse Triangle Calculator
    Solve a triangle from two sides and the included angle. Find the third side, area, perimeter, all angles, and whether the triangle is obtuse.
  • Pythagoras Triangle Calculator
    Calculate the hypotenuse of a right triangle from its two legs using the Pythagorean theorem c = √(a² + b²). Also shows area and perimeter.
  • Polygon Interior Angle Calculator
    Calculate the sum of interior angles and each interior/exterior angle of any polygon by entering the number of sides. Free, instant, and accurate.
  • Polar to Rectangular Coordinates Calculator
    Convert polar coordinates (r, θ) to rectangular (x, y) instantly. Supports degrees or radians using x = r·cos θ and y = r·sin θ.
  • Polar Form Calculator
    Convert a complex number a + bi to polar form. Get magnitude r and angle θ in degrees and radians instantly with this free calculator.
  • Missing Side of a Right Triangle Calculator
    Find the missing side of a right triangle using the Pythagorean theorem. Solve for the hypotenuse or a leg from any two known sides instantly.
  • Sine Calculator
    Calculate sine values effortlessly with this sine calculator. Input angle in degrees or radians and get precise results. Essential tool for trigonometry and mathematics.
  • Isosceles Triangle Angles Calculator
    Find the missing angles of an isosceles triangle. Enter a base angle or the vertex angle and instantly get the remaining angles.
  • Inverse Sine Calculator
    Enter a sine value between −1 and 1 to compute its inverse sine (arcsin). Choose degrees or radians and get the angle instantly.
  • Triangle Interior and Exterior Angles Calculator
    Find the third interior angle and all three exterior angles of any triangle from two known interior angles. Uses the 180° angle-sum rule.
  • Inscribed Angle Calculator
    Calculate the inscribed angle of a circle from its central angle. The inscribed angle equals half the central angle subtending the same arc.
  • Tangent Calculator
    Enter an angle in degrees or radians to get its tangent instantly. See tan(θ) plus the angle shown in both degrees and radians for quick reference.
  • Spherical to Cylindrical Coordinates Converter
    Convert spherical coordinates (r, theta, phi) to cylindrical coordinates (rho, theta, z) using the physics/ISO convention. Supports degrees or radians.
  • Cylindrical to Spherical Coordinates Converter
    Convert 3D cylindrical coordinates (rho, theta, z) to spherical coordinates (r, theta, phi) instantly, in degrees or radians, with the exact formulas shown.
  • Spherical to Cartesian Coordinates Converter
    Convert 3D spherical coordinates (r, theta, phi) to Cartesian (x, y, z). Theta is azimuth, phi is polar. Choose degrees or radians.
  • Cartesian to Cylindrical Coordinates Converter
    Convert 3D Cartesian coordinates (x, y, z) to cylindrical coordinates (rho, theta, z). Choose degrees or radians for the angle. Uses atan2 for correct quadrant.
  • Cylindrical to Cartesian Coordinates Converter
    Convert 3D cylindrical coordinates (rho, theta, z) to Cartesian (x, y, z) instantly. Supports degrees or radians. Free online coordinate converter.
  • Double Angle Identities Calculator
    Compute sin(2θ), cos(2θ) and tan(2θ) from any angle in degrees or radians using the trigonometric double angle identities. Free and instant.
  • Cartesian to Spherical Coordinates Converter
    Convert 3D Cartesian coordinates (x, y, z) to spherical coordinates (r, theta, phi). Output angles in degrees or radians. Free online math tool.
  • Double Angle Calculator
    Compute sin(2x), cos(2x) and tan(2x) instantly with the double-angle formulas. Enter any angle in degrees or radians and get exact decimal values.
  • Cosine Rule Triangle Calculator
    Solve a triangle with the law of cosines. Enter two sides and the included angle to find the third side, remaining angles, perimeter, and area.
  • Cosh (Hyperbolic Cosine) Calculator
    Compute the hyperbolic cosine cosh(x) = (e^x + e^-x)/2 for any real number x instantly with this free online cosh calculator.

Categories