Earring Size Calculator

Two questions, one earring. Nothing you type leaves the browser.

An earring is sold by a diameter or a drop, and it is worn against two lines a tape can take: your jaw line and your chin line. This tool takes the readings the site's guides are built on — cheekbone width, a jaw ratio or a face ratio, and the number off the listing — and runs both checks on them.

It is one earring calculator with two modes. Size mode measures an earring against the jaw line: the share a single piece covers, the share the pair spans, and how many of the published deviations the pair is worth. Drop-length mode is the earring length calculator: face length, the room below the chin, and whether a drop crosses that line — and by how much. Both modes print every intermediate figure, so each step can be checked with your own tape.

Your earring and your lines

Cheekbone width

Point to point across the cheekbones, in millimetres — the width every line here is built from.

Jaw ratio

Jaw corner to corner ÷ cheekbone point to point. The calculator gives it, or take both readings with a tape.

Earring diameter or length

The number off the listing, in millimetres.

Fill the cheekbone width and this mode's two fields to get the reading.

Calculated in your browser — the numbers you type are never sent to a server.

What the tool runs, step by step

Jaw line = jaw ratio × cheekbone width. The published ladder's middle rung is 122.4 mm at the working 136 mm width, and a single 8 mm earring covers 6.5 per cent of it — the pair, 13.1.
The pair adds 2 × diameter ÷ cheekbone width to the width ratio, and that sum is divided by the published deviation, 0.12, which is what turns a diameter into a deviation reading. One whole deviation at the working width is a diameter of 8.16 mm.
Face length = face ratio × cheekbone width, and the gap below the chin is a third of it: 40.8 to 81.6 mm across the published ratios at the working width.
Crossing = drop − gap, with the sign kept. A 70 mm drop on a 1.35 face at 136 mm crosses by 8.8 mm — 0.065 of a ratio at that width, 0.35 of the published deviation. A 60 mm drop stops 1.2 mm short of the same line.

Where these rules come from

Every rule above is published on this site, spelled out in one of these guides — one for each mode, and one for each tape reading the modes start from:

The soft part is the level both modes count at. An ornament whose widest point sits at the ear rather than on the jaw line adds nothing there, and the drop mode assumes the earlobe sits at the boundary of the face's lower third. If a reading lands near a line, measure once more before ordering.