Pythagorean Theorem Calculator

  • Enter the lengths of two sides (Side A and Side B) and the hypotenuse (if known) of a right triangle.
  • Choose the unit of measurement from the dropdown menu.
  • Click the "Calculate" button to find the area, perimeter, and angles of the triangle.
  • The results will be displayed below along with a visualization of the triangle.
  • You can copy the results or clear the inputs using the respective buttons.
  • Your calculation history will be displayed in the "Calculation History" section.




Angle A:

Angle B:

Calculation History


    The Pythagorean Theorem Calculator is a valuable mathematical tool that allows users to quickly and accurately compute the length of the hypotenuse or one of the other sides of a right triangle. This tool is based on the Pythagorean Theorem, a fundamental concept in geometry that has profound implications in various fields.

    The Pythagorean Theorem

    The Pythagorean Theorem, attributed to the ancient Greek mathematician Pythagoras, states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. In mathematical terms, it can be expressed as:

    a² + b² = c²


    • “a” and “b” are the lengths of the two shorter sides (legs) of the right triangle.
    • “c” is the length of the hypotenuse.

    The Pythagorean Theorem Calculator

    The Pythagorean Theorem Calculator is a tool that simplifies the process of solving for any of the triangle’s sides or angles when you know the values of the other two sides. Users can input the known values, and the calculator will provide the result instantly. This tool is especially useful when dealing with complex calculations or when you need quick results.

    Related Formulas

    In addition to the Pythagorean Theorem itself, several related formulas are essential for working with right triangles:

    Trigonometric Ratios

    1. Sine (sin θ) = Opposite side / Hypotenuse
    2. Cosine (cos θ) = Adjacent side / Hypotenuse
    3. Tangent (tan θ) = Opposite side / Adjacent side

    Pythagorean Triplets

    Pythagorean triplets are sets of three positive integers (a, b, and c) that satisfy the Pythagorean Theorem. Some common Pythagorean triplets include (3, 4, 5), (5, 12, 13), and (7, 24, 25). These triplets are widely used in various mathematical and practical applications.

    Example Calculations

    Let’s explore a few example calculations using the Pythagorean Theorem Calculator:

    Example 1:

    Given a right triangle with one leg (a) measuring 6 units and the other leg (b) measuring 8 units, we can use the Pythagorean Theorem to find the length of the hypotenuse (c):

    a = 6, b = 8

    c² = 6² + 8² c² = 36 + 64 c² = 100

    Taking the square root of both sides, we find: c = 10 units

    Example 2:

    In this example, we have a right triangle with a hypotenuse (c) of 10 units and one leg (a) measuring 6 units. We want to find the length of the other leg (b):

    a = 6, c = 10

    Using the Pythagorean Theorem: b² = 10² – 6² b² = 100 – 36 b² = 64

    Taking the square root of both sides: b = 8 units

    Real-World Use Cases

    The Pythagorean Theorem and its calculator have numerous practical applications across various fields:

    Architecture and Construction

    Architects and construction workers use the Pythagorean Theorem to ensure that structures are built with proper angles and dimensions. It helps in measuring distances, setting foundations, and constructing right angles.


    Engineers frequently apply the theorem in designing machinery, bridges, and other structures. It aids in calculating forces, determining optimal angles, and ensuring stability.


    Navigation systems, both on land and at sea, rely on the Pythagorean Theorem to calculate distances and angles. It plays a vital role in GPS technology.


    Astronomers use the theorem to calculate distances between celestial objects and to determine the angles and sizes of objects in the night sky.

    Computer Graphics

    In computer graphics, the Pythagorean Theorem is used to calculate distances between points, making it a fundamental concept for rendering 2D and 3D graphics.


    The Pythagorean Theorem Calculator simplifies complex calculations involving right triangles and makes it easy for users to find the length of any side or angle quickly. This tool is not only valuable in mathematics but also finds extensive use in practical applications across various fields, including architecture, engineering, navigation, astronomy, and computer graphics.


    1. Stroud, K. A., & Booth, D. J. (2013). Engineering Mathematics. Palgrave Macmillan.
    2. Johnson, R. A. (2007). Advanced Mathematics for Engineers. CRC Press.

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