The Press-On Nail Size Chart That Ends Guessing
A free press-on nail size chart you can actually use — millimeters, not guesses. Download the printable chart and get your numbers right the first time.
A press-on nail size chart should do one job: translate the width of your nails into the right size to buy. Most charts fail at it because they trade in letters — S, M, L — that mean something different on every brand. This one trades in millimeters, which mean the same thing everywhere.
The chart
Standard press-on sizes run 0 (largest) through 9 (smallest). As a general scale:
| Size | Approx. width |
|---|---|
| 0 | 18 mm |
| 1 | 16 mm |
| 2 | 15 mm |
| 3 | 14 mm |
| 4 | 13 mm |
| 5 | 12 mm |
| 6 | 11 mm |
| 7 | 10 mm |
| 8 | 9 mm |
| 9 | 8 mm |
Treat this as a starting reference, not gospel — brands vary, so always check the specific brand's chart before ordering. Your own measurements are the constant; the chart is the translation.
How to use it (5 minutes, once)
- Measure each nail sidewall to sidewall in millimeters, at the widest point of the nail plate. A millimeter ruler or soft tape works.
- Write ten numbers — one per finger, both hands, dated. Left thumb 15, left index 12, and so on.
- Match each number to the closest size on the chart. Between two sizes? Go smaller. A slightly small nail files to fit; a slightly big nail lifts and pops.
- Keep the card. This is now your ordering reference for every brand, every set, until your nails change.
Why letters lie (and numbers don't)
There is no industry standard for what "medium" means on a press-on box. One brand's medium is another brand's large. Millimeters, on the other hand, are millimeters — your 13 mm index finger is 13 mm no matter whose box you're holding. The chart works because it anchors to your real measurements instead of a brand's marketing labels.
Size card vs. size chart: what's the difference?
People mix these up. The size chart is the brand's translation table — their sizes mapped to millimeters. Your size card is personal — your ten measurements, dated. You need both: the card tells you your numbers, the chart tells you which box to buy. Anyone selling you a "universal" chart without telling you to measure first is selling you a guess with better graphic design.
What to do when a brand's chart doesn't match yours
It happens — your thumb measures 16 mm and the brand's largest size tops out at 15. Don't squeeze into it. An undersized nail (too small for the nail bed) leaves skin exposed at the sidewalls, looks off, and pops just as fast as an oversized one. Either pick a brand whose range actually covers your numbers, or — if it's one stubborn finger — wear that brand's largest on the other nine and source the odd one separately. Your numbers are non-negotiable; the brand is replaceable.
The fine print that matters
- Re-measure seasonally. Nails change with growth, damage, and time. A card from six months ago is a suggestion, not a fact.
- Wide and narrow beds welcome. The method doesn't care about your nail shape — it only cares about width. Wide beds: verify the brand actually stocks your larger sizes before falling in love with a set.
- File, don't force. Between sizes, take the smaller and gently file the sidewalls to match your nail's curve. Ten seconds per nail.
Get the printable version
The free Perfect Fit Cheat Sheet has this chart in printable form, plus the quick-reference sizing method and the pop-off checklist — one page, fridge-worthy. Grab it below and it'll land in your inbox.
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Free download
The printable Perfect Fit Cheat Sheet.
This chart plus the quick-reference sizing method and pop-off checklist — one page, fridge-worthy. Drop your details and it lands in your inbox.