Beyond the chart
Large ring sizes
Most charts stop at US 13.5 — but fingers do not. This page continues the chart's own spacing above US 13.5, with every value clearly labelled as an approximation, and the millimetre diameter and circumference that a seller can actually work from.
How these sizes are worked out
The chart's own spacing
The verified chart runs US 3 = 14.07 mm to US 13.5 = 22.61 mm in half-size steps of about 0.41 mm. Continuing that spacing upward — one half step at a time — is the only honest way to extend it, and it is what the table below does.
The formula, in the open
US size ≈ 13.5 + 0.5 × ((diameter − 22.61) ÷ 0.41), and circumference = π × diameter. Work it from your measured diameter, not from a label you already own — and round to the nearest half size only after checking the millimetres.
Why millimetres come first here
Above US 13.5, retailers disagree more, stock thins out, and some use their own large-size ladders. A seller who hears "US 15" may picture a different ring than you do; a seller who hears "23.84 mm diameter, 74.9 mm circumference" pictures exactly your ring.
Large sizes table — approximations
| US (approx.) | Inner diameter (mm) | Inner circumference (mm) | EU (circumference, rounded) |
|---|---|---|---|
| 14 | 23.02 | 72.3 | 72 |
| 14.5 | 23.43 | 73.6 | 74 |
| 15 | 23.84 | 74.9 | 75 |
| 15.5 | 24.25 | 76.2 | 76 |
| 16 | 24.66 | 77.5 | 77 |
| 16.5 | 25.07 | 78.8 | 79 |
| 17 | 25.48 | 80.0 | 80 |
UK letters stop at Z in the standard letter ladder (this site's chart shows Z+1 for US 13.5); there is no standard UK letter for US 14 and above, which is another reason to order large rings by millimetres. EU numbers above are simply the rounded circumference, as EU numbering always is.
Ordering a large ring
- Measure twice, in the evening. Large fingers vary more through the day, and a half-size error at US 15 is a bigger absolute error than at US 7. Tape or strip, warm hands, evening, twice, largest reading.
- Send millimetres, not just a label. "US 15, diameter 23.84 mm, circumference 74.9 mm" lets the seller check their own ladder against your measurement instead of trusting your label.
- Ask about stock and resizing before paying. Some sellers stop at US 14, some charge extra above it, and some large rings (tungsten, titanium, eternity bands) cannot be resized at all. Confirm all three before ordering.
- Mind the knuckle and the band width. A large knuckle needs a size that passes it; a wide band (8 mm or more) feels tighter than a thin band at the same size — size up for wide bands, as the wide-band guide explains.
Limitations
The sizes on this page are extrapolations, not published chart rows: the verified chart on this site ends at US 13.5 (22.61 mm). Real large-size ladders vary by retailer, wide bands and knuckles matter more at large sizes, and some sellers do not stock above US 14 at all. Confirm any large size with the seller using your millimetre measurement before ordering.
Related guides
- International ring size chart
The verified chart this page continues, US 3 to 13.5.
- Ring size calculator
Type a large measurement — it now shows millimetres instead of an error.
- Thumb ring sizing
Thumbs are the most common large-size finger — and the most position-sensitive.
- Wide band ring sizing
Wide bands feel tighter at the same size; large wide bands doubly so.