Lip Shapes
Four measurements, not one label: how full your lips are against your mouth width, how the upper compares to the lower, how defined your Cupid's bow is, and which way your corners point. They are independent, which is why a lip can be thin, heart-shaped and downturned at the same time.
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What is my lip shape?
Four independent measurements decide it: total lip height against mouth width, the ratio between upper and lower lip, the height of your Cupid's bow peaks above the central dip, and the angle from the centre of your mouth to its corners. Named shapes are labels applied to combinations of those four.
- Total lip height above roughly 0.42 of mouth width reads as full; at or below 0.28 as thin.
- The classic upper-to-lower reference is about 1:1.6, a proportion convention rather than a measured norm.
- Cupid's bow definition is independent of volume — a thin lip can have a sharply defined bow.
- Downturned corners are a negative corner angle, the mouth's equivalent of a negative canthal tilt.
- Lip projection is the one lip trait a front-facing photo cannot measure.
The lip shapes and the Cupid's bow
- Cupid's BowThe Cupid's bow is the double curve along the top edge of your upper lip — two peaks with a dip between them, named after the shape of the bow the Roman god is drawn holding. Everyone has one; what varies is how sharply defined it is.
- Thin LipsThin lips have a total lip height below roughly 0.28 of mouth width. It is a measurement, and worth saying plainly because most of what is written about it treats it as a problem: nearly every page ranking for this term is selling filler.
- Full LipsFull lips have a total lip height above roughly 0.42 of mouth width. Fullness is independent of every other lip measurement — a full pair can have a flat Cupid's bow, downturned corners, or an unbalanced upper-to-lower ratio, and often does.
- Heart-Shaped LipsHeart-shaped lips have a sharply defined Cupid's bow with pronounced peaks, giving the upper lip the two-lobed outline the name describes. It is the one lip label defined by the border rather than by volume, which is why it can coexist with thin lips or full ones.
- Downturned LipsDownturned lips have mouth corners sitting below the centre line of the mouth, giving the resting expression a slight droop. It is the mouth's version of a negative canthal tilt, and like that measurement it is an angle rather than a mood.
- Wide LipsWidth is a separate axis from fullness, and confusing the two is the most common mistake in lip charts. A wide mouth with average lip height reads as thin, and a narrow mouth with the same height reads as full — the height did not change.
How to tell your lip shape in a mirror
- 1
Relax your mouth completely and look straight on in flat, even light. Pressing your lips together or smiling changes every one of the four measurements.
- 2
Compare the total height of both lips against the width of your mouth. That is fullness, and it is the measurement most charts stop at.
- 3
Look at the upper and lower separately. A thin upper with an average lower is the most common configuration and it is not the same as thin lips.
- 4
Trace the top edge of your upper lip. Two distinct peaks with a dip between them is a defined Cupid's bow; a single gentle curve is a soft one.
- 5
Hold a straight edge horizontally across the centre of your mouth and see where the corners fall relative to it.
Lip shape chart: the six types and what defines each
Read down the second column and the structure becomes clear: these are not six alternatives but four independent measurements with names attached. A mouth can be thin, heart-shaped and downturned at the same time, and many are.
| Lip shape | The measurement that defines it |
|---|---|
| Cupid's Bow | The height of the two peaks above the central dip, measured against mouth width. Above roughly 0.035 of mouth width the bow reads as defined; below that it reads as soft or flat. |
| Thin Lips | Total lip height — the top of the upper lip to the bottom of the lower — divided by mouth width. At or below about 0.28 reads as thin; the majority of faces sit between 0.28 and 0.42. |
| Full Lips | Total lip height divided by mouth width, above about 0.42. The upper-to-lower ratio is measured separately, because fullness says nothing about how the volume is distributed between the two lips. |
| Heart-Shaped Lips | Cupid's bow peak height against mouth width, above roughly 0.035, together with enough vermilion for the shape to read. The tool reports the bow depth as its own number. |
| Downturned Lips | The angle from the centre of the mouth to each corner, in degrees. Below zero means the corners sit lower than the centre; the tool reports the average of both sides. |
| Wide Lips | Mouth width against face length. A classic reference places the mouth corners roughly below the inner edges of the irises, which the tool can compare directly. |
How lips change with age
Every one of the four measurements moves, and they move in the same direction for nearly everyone. Volume decreases, so total lip height falls against mouth width. The vermilion border loses definition, so the Cupid's bow flattens and its two peaks soften. The upper lip descends, which lengthens the philtrum and shows less vermilion at rest. And the corners drop as the tissue supporting them loses volume.
Mouth width is the exception. It is set by bone and muscle attachment and is one of the most stable measurements on the face, which is why a wide mouth at twenty is a wide mouth at sixty even though everything inside it has changed. If you want to track any of this, the measurement to record is the ratio rather than the appearance — the philtrum measurement in particular changes earlier and more reliably than volume does.
Lip shapes — frequently asked questions
How many lip shapes are there?
Charts usually list between six and ten. The number is a naming convention: lips vary along four independent measurements, and the named shapes are labels put on combinations of them.
Can I have more than one lip shape at once?
Yes, and most people do. The four measurements are independent — fullness, upper-to-lower ratio, Cupid's bow definition and corner angle — so a mouth can be full, heart-shaped and downturned simultaneously. Each named shape describes one axis, not the whole mouth.
Why do lip shape quizzes give different answers?
Because each reports one label from one of those four axes, and they do not all pick the same one. A lip that is thin, heart-shaped and downturned is all three at once, and a single-label quiz has to discard two.
What is the ideal lip ratio?
The reference most often quoted places the upper lip at about 0.62 of the lower — a 1:1.6 ratio. It is a proportion convention rather than a measured norm, and populations vary around it considerably.
Which lip measurement is the most stable?
Mouth width. It is set by bone and muscle attachment and barely moves across adulthood, while volume, bow definition, philtrum length and corner angle all change. If you want a measurement that means the same thing at twenty and at sixty, that is the one.