The electric field created by a single point charge can be calculated using Coulomb's law. The formula to calculate the electric field (E) is given by E = k * q / r^2, where k is the electrostatic constant (k = 8.99 x 10^9 N m^2/C^2), q is the charge of the object creating the electric field, and r is the distance from the object. For example, suppose we have a point charge with a charge of +2 µC located 0.5 m away from a test charge. The electric field at that location can be calculated using the formula.