How to Find Your Perfect Press-On Nail Size (XS–L Chart)

The single biggest reason press-ons fail is wrong sizing. A set sized perfectly lasts twice as long, looks natural, and feels comfortable. Here's exactly how to measure your nails and pick the right size from any XS–L set — including our own.

Why Size Matters So Much

A press-on that's too small sits above your natural nail and looks fake. One that's too big touches the skin at the sides, lifts within hours, and can even cause pressure. Getting it right means edge-to-edge coverage: the press-on covers your entire nail bed but never overlaps your skin.

What You'll Need

• A ruler or measuring tape (millimeters)
• Your natural nails — bare and dry
• 2 minutes

Step-by-Step: How to Measure Your Nails

1. Measure the widest point. Place the ruler flat across your nail at its widest spot (usually near the middle of the nail bed, not the tip).
2. Write down the width in millimeters for each finger. Most people need 2 different sizes, but it's normal to need 3.
3. Match to the chart below. If your nail is between two sizes, size up and file the sides lightly — a nail you can take down will always fit better than one too narrow to cover the sidewall.
4. Check your pinky and thumb — they're almost always a size apart from your middle fingers.

XS–L Size Chart (Approximate Nail Bed Width)

Sizes vary slightly between brands — always measure fresh, and check the size note on the specific product page.

When You're Between Two Sizes

• Size up. A press-on that is slightly too big can be filed down to fit; a slightly small one leaves bare nail at the sides and nothing for the adhesive to grip.
• File the sides. Our sets include a mini file — a few gentle passes on the side edges give a custom fit.
• Don't force it. If it touches skin on both sides, it's the wrong size — try the next one up.

Every Ubeauty Set: 24 Pieces in 12 Sizes

Here's the best part — our press-on sets include 24 nails in 12 sizes, with two of every size. That means you get two full trials: match every finger from the first tray, and if one size is off, the spare nails in that size are right there. No measuring anxiety, no wasted sets.

Need the tools to apply them perfectly? Grab our Nail Application Kit (glue + jelly tabs + tools) and follow the application guide for 2-week wear.

FAQ: Press-On Nail Sizing

How do I know what size press-on nails I need? Measure the widest point of each natural nail in millimetres, then match those widths to the size chart. Most people need two different sizes across ten nails.

How do you measure your nails for press-ons? Lay a ruler flat across the nail at its widest spot — usually mid-nail-bed, not the tip — and write down the width for each finger. Bare, dry nails only.

What if I'm between two sizes? Size up and lightly file the side edges. A press-on that is slightly too big can be taken down to fit, and a nail that covers the whole sidewall looks more natural.

What happens if press-on nails are too big? They overlap onto your skin at the sides, lift within hours, and can cause pressure and discomfort. If it touches skin on both sides, go up a size instead.

Do press-on nails come in different sizes? Yes — every Ubeauty set includes 24 nails across 12 sizes, two of each, so you can fit all ten nails and still have spares if one size is off.

What's the average press-on nail size? Medium (12–13 mm nail bed width) fits average hands, but thumbs and pinkies are almost always a size or two different from your middle fingers — measure all ten.

The Bottom Line

Measure the widest part of each nail, match to the chart, size up when in doubt, and file for a custom fit. With 12 sizes per set, you're covered. Browse Ubeauty press-on nails — free US shipping $35+.