Trigonometry Calculator

  • Trig Ratio from Sides Calculator
    Find sin, cos, tan, csc, sec and cot of an angle from right-triangle side lengths. Hypotenuse auto-computed from the two legs via Pythagoras.
  • Diagonal of a Rectangle Calculator
    Find the diagonal of a rectangle from its length and width. Also computes the diagonal angle, perimeter, and area instantly using the Pythagorean theorem.
  • Distance from Point to Line Calculator
    Calculate the perpendicular distance from a point (x₀, y₀) to a line ax + by + c = 0 using d = |ax₀+by₀+c|/√(a²+b²). Free and instant.
  • Degrees to Radians Calculator
    Convert angles from degrees to radians instantly. Enter any degree value to get the exact radian measure plus its multiple of pi.
  • Radians to Degrees Calculator
    Convert radians to degrees instantly. Enter any angle in radians and get the exact degree value using deg = rad × 180/π. Free online angle converter.
  • Triangle Side from Two Sides & Included Angle (Law of Cosines)
    Find the third side of a triangle from two sides and the included angle using the Law of Cosines: c = √(a² + b² − 2ab·cosC). Free, instant.
  • Right Triangle Legs from Hypotenuse and Angle Calculator
    Find both legs of a right triangle from the hypotenuse and an acute angle. Computes opposite = c·sinθ and adjacent = c·cosθ instantly.
  • Six Trigonometric Functions and Their Inverses Calculator
    Compute sine, cosine, tangent, cotangent, secant and cosecant of any angle, or find the angle from an inverse trig function. Degrees, radians or gradians.
  • Trigonometric Functions Calculator (Pi Radians)
    Evaluate sin, cos, tan, cot, sec or csc for an angle given as a multiple of pi radians. Enter n and get the exact function value at theta = n times pi.
  • Inverse Trigonometric Function Calculator
    Compute arcsin, arccos, arctan, arccot, arcsec or arccsc of a value. Get the principal-value angle in degrees or radians, plus domain and range.
  • Trigonometric Function Evaluator (Angle in Multiples of Pi Radians)
    Evaluate sine, cosine, tangent, cotangent, secant or cosecant at any angle entered in pi radians, radians, degrees or gradians. Handles asymptotes.
  • Trigonometric Function Calculator
    Evaluate sin, cos, tan, cot, sec or csc for any angle in degrees, radians, gradians or turns. Instant results with pole detection for undefined points.
  • Law of Sines Calculator
    Solve a triangle with the Law of Sines: find a missing angle or side, then get all sides, all angles, perimeter, area, inradius and circumradius.
  • Triangle Theorems Calculator (AAA, AAS, ASA, ASS/SSA, SAS, SSS)
    Solve any triangle from AAA, AAS, ASA, ASS/SSA, SAS or SSS inputs. Get all angles, sides, perimeter, area, inradius and circumradius instantly.
  • Law of Cosines Calculator
    Solve any triangle with the Law of Cosines. Enter three sides (SSS) to find all angles, perimeter, area, inradius and circumradius instantly.
  • Decimal Degrees to DMS Converter
    Convert coordinates between Decimal Degrees (DD), Degrees-Minutes-Seconds (DMS) and Degrees-Decimal-Minutes (DMM). Handles negative GPS lat/long, all six directions.
  • Rise Over Run to Degrees Calculator
    Convert rise over run into a slope angle in degrees. Enter vertical rise and horizontal run to get the angle, percent grade, and ratio instantly.
  • Hyperbolic Tangent tanh(x) Function and Derivatives Calculator
    Compute tanh(x), its first and second derivatives at any x, or over a range. Free online hyperbolic tangent calculator with formulas and a value table.
  • Second Derivative of tanh(x) Calculator
    Compute the second derivative tanh''(x) of the hyperbolic tangent at any real x, plus tanh(x) and its first derivative. Instant, high-precision results.
  • tanh(x) Hyperbolic Tangent Function Calculator
    Compute the hyperbolic tangent tanh(x) plus its first and second derivatives at any real x. Free, instant, high-precision math activation-function tool.
  • Tanh Function First Derivative Calculator
    Compute tanh(x) and its first derivative tanh'(x) = 1 - tanh(x)^2 (plus the second derivative) at any real x. Ideal for neural-network activation math.
  • Coordinate Rotation About the Origin Calculator
    Rotate a 2D point about the origin by any angle. Enter x, y and the rotation angle in degrees or radians to get the new coordinates instantly.
  • Inverse Jacobi Elliptic Function arcsn(x, k)
    Compute the inverse Jacobi elliptic sine arcsn(x, k): the value u with sn(u,k)=x, via the incomplete elliptic integral of the first kind F(arcsin x, k).
  • Trig Triangle Calculator
    Solve a triangle from two sides and the included angle (SAS) using the law of cosines and law of sines. Finds the third side, angles, area, and perimeter.

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