TL;DR: Press a strip of clear tape across the widest part of each natural nail, mark the edges, and measure the width in millimeters against a ruler. Do all 10 nails (they're rarely the same), then match to the brand's size chart. If you're between sizes, size down for a snug, salon-look fit. Total time: about 2 minutes.
Why sizing is the #1 reason press-ons fail
Most "press-ons look fake" complaints come down to fit, not quality. A tip that's even 1 mm too wide digs into your skin and lifts at the edges; too narrow leaves a visible gap. Salon nails look custom because they are — so the goal at home is the same: a tip that covers your nail side-to-side with no overhang.
The tape method (2 minutes, no tools)
- Tape: press a strip of clear tape across the widest part of your natural nail.
- Mark: use a pen to mark where the nail meets the skin on each side.
- Measure: lay the tape flat on a ruler and read the width in millimeters.
- Repeat for all 10 nails — thumbs and pinkies surprise almost everyone.
- Match: compare to the size chart, or email your 10 numbers to a brand that offers custom sizing.
Quick reference: fit rules
| Situation | What to do |
|---|---|
| Between two sizes | Size down — a snug edge looks custom; overhang looks pressed-on |
| Wide or flat nail beds | Choose square or coffin shapes; avoid narrow almond |
| Curved (C-curve) nails | Warm the tip between fingers before applying so it flexes to your curve |
| One nail fits badly | File the tip's sides 1–2 strokes — gel tips file easily |
The zero-guesswork option
At Luvmani every set is made in your size (XS–L), and if you want an exact match you can email your 10 measurements and our studio will size your set to the millimeter. Still unsure? The $6.99 Sizing Kit ships 10 numbered try-on tips, and the $6.99 comes off your next order. And if anything's off, we remake the sizes you need free within 30 days — no returns needed.
FAQ
Do I really need to measure all 10 nails?
Yes. Most people have 3–4 different widths across one hand. Two minutes of measuring saves a week of lifting edges.
What if my size changes between brands?
It does — there's no universal sizing standard for press-ons. Always check the brand's own chart, or buy from brands that size each set to you.
What's the most common sizing mistake?
Measuring the middle of the nail instead of the widest point, and skipping the thumb. Widest point, all 10 nails.
What if I ordered the wrong size?
With us: nothing bad. Free resize within 30 days — we remake the sizes you need.
Ready to test the fit promise? Start with The Essentials — handmade French tips and solids from $24.