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Demoivre’s Theorem Calculator Online

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The Demoivre’s Theorem Calculator is a powerful tool that simplifies complex number calculations. It allows users to raise a complex number to a given power efficiently and accurately. This calculator is particularly useful in various fields such as mathematics, physics, engineering, and signal processing.

Formula of Demoivre’s Theorem Calculator

The formula used by the Demoivre’s Theorem Calculator is as follows:

z^n = r^n * (cos(n*theta) + i*sin(n*theta))


  • z is the complex number.
  • r is the magnitude (distance from the origin to the point in the complex plane).
  • θ is the angle in radians between the positive x-axis and the line joining the origin to the point in the complex plane.
  • n is the power to which the complex number is raise.
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General Terms Table

Complex NumberA number that can be expressed in the form a + bi, where a and b are real numbers, and i is the imaginary unit.
MagnitudeThe distance from the origin to a point in the complex plane.
AngleThe measure of rotation required to reach a point from the positive x-axis in radians.
PowerThe exponent to which the complex number is raised.

This table provides a quick reference for users to understand the terms commonly associated with complex numbers and the Demoivre’s Theorem.

Example of Demoivre’s Theorem Calculator

Let’s illustrate the usage of the Demoivre’s Theorem Calculator with an example:

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Suppose we have a complex number z = 3 + 4i, with a magnitude of r = 5 and an angle of θ = π/3 (60 degrees). If we want to raise this complex number to the power of n = 2, we can use the calculator to obtain the result.

Most Common FAQs

Q: How do I use the Demoivre’s Theorem Calculator?

A: Simply input the complex number, its magnitude, angle in radians, and the desired power into the respective fields. Then, click the “Calculate” button to obtain the result.

Q: Can I use Demoivre’s Theorem for non-integer powers?

A: Yes, Demoivre’s Theorem can be extended to non-integer powers using the formula z^n = r^n * (cos(n*theta) + i*sin(n*theta)), allowing for fractional and negative exponents.

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