The golden ratio The Golden Ratio is a mathematical formula devised in ancient Greece to determine 'physical perfection' by comparing measurements, ratios and symmetry. During the Renaissance, artists and Architects used the equation, also known as Phi, as an aid during the creation of their masterpieces. Scientists have since adapted the mathematical formula, which equates to 1/1.618, to explain what makes a person beautiful. The length and the width of someone's face is measured and then the results are divided. Measurements are then taken from the forehead hairline to the spot between the eyes, from the spot between the eyes and the bottom of the nose and from the bottom of the nose to the bottom of the chin.