Vector Magnitude Calculator

Calculate vector magnitude step by step

An online calculator for finding the magnitude (length, norm) of a vector, with steps shown.

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Introducing our Vector Magnitude Calculator, an online tool designed to help you compute the magnitude of vectors with ease. Whether you're aiming to calculate the magnitude of a force or any other physical entity represented as a vector, this calculator is the ideal tool for your needs.

How to Use the Vector Magnitude Calculator?

  • Input

    Enter the coordinates of your vector in the specified field.

  • Calculation

    After inputting the vector coordinates, simply click on the "Calculate" button.

  • Result

    The calculator will immediately compute and display the magnitude of the entered vector.

What Is Vector Magnitude?

In the realm of mathematics, the magnitude of a vector refers to its length within the defined vector space. Since magnitude is a scalar quantity, it only has a size and doesn't carry any directional information. This becomes particularly useful in physics, where the magnitude often corresponds to the size of physical entities like force or velocity.

For a vector, $$$\mathbf{\vec{u}}$$$ a two-dimensional (2D) space defined as $$$\mathbf{\vec{u}}=u_1\mathbf{\vec{i}}+u_2\mathbf{\vec{j}}=\left\langle u_1,u_2\right\rangle$$$, the magnitude of the vector, denoted as $$$\mathbf{\left\lvert\vec{u}\right\rvert}$$$, can be computed using the Pythagorean theorem as follows:


Here, $$$u_1$$$ and $$$u_2$$$ represent the coordinates of the vector along the x and y axes, respectively. $$$\sqrt{}$$$ refers to the square root function.

In a three-dimensional (3D) space, a vector $$$\mathbf{\vec{u}}$$$ is typically defined as $$$\mathbf{\vec{u}}=u_1\mathbf{\vec{i}}+u_2\mathbf{\vec{j}}+u_3\mathbf{\vec{k}}=\left\langle u_1,u_2,u_3\right\rangle$$$. In this case, the magnitude can be calculated using an extension of the Pythagorean theorem:


To illustrate, let's consider the 2D vector $$$\mathbf{\vec{u}}=3\mathbf{\vec{i}}+4\mathbf{\vec{j}}=\left\langle 3,4\right\rangle$$$.

The magnitude of $$$\mathbf{\vec{u}}$$$ would be $$$\mathbf{\left\lvert\vec{u}\right\rvert}=\sqrt{3^2+4^2}=\sqrt{9+16}=\sqrt{25}=5$$$.

Do All Vectors Have a Magnitude?

Yes, all vectors have a magnitude. The magnitude of a vector, often referred to as its length or size, is a scalar quantity that indicates how long the vector is. Even a zero vector, which has no direction, has a magnitude — it is simply zero. The magnitude of a vector is always a non-negative real number, regardless of the dimension of the vector space. Whether dealing with forces in physics or displacement in geometry, the concept of magnitude plays a critical role in understanding and working with vectors.

Why Choose Our Vector Magnitude Calculator?

  • User-Friendly Interface

    The calculator is designed to be straightforward, easy to navigate and use. This makes it suitable for users at any level of expertise.

  • Speed and Efficiency

    Our calculator instantly provides the results, saving you a significant amount of time that manual calculations could take.

  • Accuracy

    With our Vector Magnitude Calculator, you can be assured of the accuracy of the results, thereby eliminating potential manual errors.

  • Versatility

    Our calculator can handle vectors in both 2D and 3D spaces.


Do all vectors have a magnitude?

Yes, all vectors have a magnitude. The magnitude of a vector is its length in the space it is defined. It's a scalar quantity, meaning it only has size but no direction.

How is the magnitude of a vector calculated?

For a 2D vector $$$\mathbf{\vec{u}}=\left\langle u_1,u_2\right\rangle$$$, the magnitude $$$\mathbf{\left\lvert\vec{u}\right\rvert}$$$ is calculated as $$$\sqrt{u_1^2+u_2^2}$$$. For a 3D vector $$$\mathbf{\vec{u}}=\left\langle u_1,u_2,u_3\right\rangle$$$, the magnitude is calculated as $$$\sqrt{u_1^2+u_2^2+u_3^2}$$$. $$$\sqrt{}$$$ denotes the square root function.

Can I use the Vector Magnitude Calculator for 3D vectors?

Yes, the Vector Magnitude Calculator can handle vectors in both 2D and 3D spaces.

What is the vector magnitude?

The magnitude of a vector is a scalar quantity that represents the length or size of the vector. In physics, it often represents the size of a physical quantity like force or velocity.