Here is the Vector Magnitude Calculator, whcih is an online tool to calculate the magnitude of 2D vectors with the given vector coordinates. The magnitude of a vector is the length of physical quantities. The magnitude or length of a 2D or 3D vector is denoted by |A|. It is a scalar and must be non-negative. Any vector whose length 1 is called a unit vector, denoted by "e". The magnitude of a vector can be calculated by taking the square root of the sum of the squares of its components.