Facial Thirds Calculator

What are the facial thirds?

Classical facial aesthetics divides the front of the face from hairline to chin into three segments: the upper third (hairline to brow line), the middle third (brow line to nose base) and the lower third (nose base to chin tip). The closer each is to 33.3%, the more balanced the face is vertically. It is a Renaissance-era standard that still underpins modern orthognathic and aesthetic assessment.

How to measure accurately

Face forward, camera at eye level, relaxed expression, and do not tip your head up or down — pitch is the single biggest source of error. Take the brow line through the highest point of both brows and the nose base at the level of the nostril bases. Millimetres or pixels both work, since the maths uses each segment as a percentage of the total.

What if your thirds are uneven?

A long upper third is the easiest to handle — a fringe or hairline adjustment visually shortens it. A long lower third is usually skeletal (an elongated mandible or chin) and needs an orthognathic assessment, while a short lower third responds well to chin filler or an implant. A long middle third has the least room to move; it is normally addressed by adding midface volume to change how it reads rather than by changing its actual height.