At a glance
- Term
- Lip ratio
- Area
- Face geometry
- Measurable from a selfie
- Yes: upper lip height divided by lower lip height
- Evidence
- Established
- Related
- Philtrum ratio, Cupid's bow
What the comparison tells you
A lip height ratio describes relative heights, rather than the size of your whole mouth. It answers a narrow question: how tall is the upper lip compared with the lower?
Keep the order clear. Upper divided by lower is the stated calculation; reversing it gives a different result. When comparing measurements, check that both use the same order and identify the same boundaries. The face geometry glossary explains related terms.
How to read the natural reference
The reference of about 1 to 1.6 describes a lower lip that's taller than the upper. That notation gives relative heights; the division expresses their relationship as a single value.
Fillers that even the two heights out often look visibly treated. That observation doesn't make equal heights proof of filler, or make the common ratio a treatment goal. Don't use someone's lip proportions to guess their treatment history.
What a selfie measurement can establish
A selfie can provide the upper and lower lip heights needed for this comparison. The common mistake is treating one number from one photo as a fixed fact about your face.
The free face-symmetry scan reads landmark distances from one selfie and reports left-right differences and basic ratios; it names what it measured. Read those labels before interpreting a result. Don't assume a general symmetry result includes a specific lip measurement unless it says so.
Keep height and contour separate
Your Cupid's bow describes the double curve along the upper lip edge. Lip ratio compares upper and lower lip heights. These terms describe different features, so don't use them interchangeably.
Philtrum ratio is another related term with its own measurement. Use the name that matches your question. An established geometric measurement helps describe your face; it doesn't, by itself, tell you to change it.
Questions people ask
- How do you calculate lip ratio?
- Divide upper lip height by lower lip height. Check which boundaries were measured before comparing your result with another measurement.
- Is 1 to 1.6 the ideal lip ratio?
- About 1 to 1.6 is the most common natural reference given here. Common doesn't mean every face should match it.
- Does an equal upper and lower lip prove someone has fillers?
- No. Fillers that equalize the heights often look visibly treated, but a ratio alone doesn't establish someone's treatment history.
Written from the measurements and ingredient facts on this site, then checked for the usual mistakes. Not medical advice.
Related pages
The closest pages in this section, picked by topic rather than by date.
- Understanding cupid's bow meaningUnderstand cupid's bow meaning, what the upper lip's two peaks show, and how to read a selfie measurement without treating it as fixed.
- philtrum ratio meaning: What the measurement describesLearn the philtrum ratio meaning, what a selfie can measure, and why there's no evidence for treating a particular ratio as a proven beauty
- Bigonial width meaning and how to measure itUnderstand bigonial width meaning, how a selfie measures the distance across your jaw corners, and what comparing it with cheekbone width te
- Bizygomatic width meaning: the distance across your cheekbonesLearn bizygomatic width meaning, how cheekbone width relates to face shape, and what a selfie can measure without fixing your face to a labe
- A guide to brow ridge meaningUnderstand brow ridge meaning, why a front-facing selfie can't measure its projection, and what established evidence says about changing it.
- buccal fat meaning: What it is and what photos can't showLearn the buccal fat meaning, why cheek fullness can't measure this fat pad, and what permanent removal may mean for your appearance later.
- Canthal tilt meaning: what your eye-corner angle tells youLearn the canthal tilt meaning, how to measure eye-corner angles in a selfie, and why a photo result isn't a fixed fact about your face.
- A guide to cheekbones meaningLearn cheekbones meaning, how cheek width compares with your jaw and forehead, and why one selfie cannot give a fixed measurement of your fa
- Chin projection meaning: reading your side profileUnderstand chin projection meaning, why a front selfie can't measure it, and how to read profile measurements without treating them as fixed