Upper : lower lip

What the upper-to-lower lip ratio is

This metric compares the height of the red part of your upper lip (the vermilion) to the height of the lower lip vermilion, viewed straight on. It is a measure of relative fullness between the two lips, not of overall lip size. The tool reports it as upper divided by lower, so a value below 1 simply means the lower lip is the taller of the two.

On this scale the measured value sits around 0.69, and the commonly cited ideal is described as roughly 1:1.6, a lower lip a little fuller than the upper. Naini 2011 is the clinical reference behind that convention.

Why lip balance is noticed

Lip fullness and the balance between the two lips are among the more salient features of the lower face, and the existing guidance notes this tends to weigh more in the perception of female faces. A lower lip slightly fuller than the upper is a frequent convention; lips that are very thin, or an upper lip that markedly overpowers the lower, stand out because they sit outside that pattern.

As with every proportion here, this describes a visual pattern people tend to find harmonious. It is a convention, shaped by fashion and varying by ancestry and sex, and it carries no implication about a person beyond appearance.

The range and its caveats

The tool treats about 0.55 to 0.72 as the balanced band, which brackets the roughly 1:1.6 convention while leaning toward a fuller lower lip. The honest caveats are that lip proportions vary widely between individuals and populations, and that what is fashionable changes over time. Naini 2011 frames these as clinical reference points, not fixed rules, and the fuller-lower-lip preference described here is a convention rather than a universal standard.

It is also worth separating two things the band does not distinguish: the balance between the lips and their absolute fullness. Two people can share the same ratio while one has full lips and the other thin ones, because the ratio only compares the upper to the lower. So a value inside the band tells you the two lips are in proportion to each other, not that the lips are large or small overall.

Measurement is sensitive to expression and to how relaxed the mouth is. A pressed or pursed mouth changes the visible vermilion height, and lighting that flattens the lip border can blur where each lip begins, so a calm, neutral mouth in even light gives the most representative number.

Reading your number and what is changeable

A value inside the band means your upper and lower lips sit in a commonly balanced relationship; outside it means one lip is relatively thin or full. Read it directionally, since whether the upper or the lower lip is the smaller one points to different presentation choices.

Among all the facial metrics, lips are relatively responsive to reversible, low-effort levers. Lip makeup, careful lining and gloss placement, can shift apparent fullness and balance noticeably for a photo. A noninvasive option that some choose is temporary lip filler, which adds volume to the thinner lip and fades over months; it is a cosmetic procedure with cost and risk, mentioned only as information, not advice. The underlying shape of the lips is otherwise individual anatomy.