Sizing

How to measure

Find your size

Every set comes in XS, S, M, or L — most people fit one of these cleanly. If you're ordering Custom-sized, this is where you'll measure each finger so we can build to your exact specs. Five minutes with clear tape, a pen, and a ruler.

Shortcut

Order a Custom Sizing Kit

Skip the guesswork. We'll ship you a full set of blank sizing nails in your chosen shape, one in every size. Try them on, tell us which fit, and we'll save your sizes for every future order.

Order a sizing kit — $10
clear tape pen mark pen mark
01
Place a piece of clear tape across the widest part of your natural nail.
02
Mark the edges of your nail on the tape with a pen.
03
Remove the tape.
04
Measure the distance between the lines with a ruler in millimeters.
05
Match the width to the size chart below.

Size chart

Size by width

017 mm
116 mm
215 mm
314 mm
413 mm
512 mm
611 mm
710 mm
89 mm
98 mm

Pre-set size kits

Widths per finger in mm: thumb · index · middle · ring · pinky

XS14 · 11 · 12 · 10 · 8 mm
S15 · 12 · 13 · 11 · 8 mm
M16 · 12 · 13 · 11 · 9 mm
L17 · 13 · 14 · 12 · 10 mm

Pro tips

For a perfect fit

Size up, not down

Between sizes? Pick the bigger one. You can file the sides down to fit. You can't add millimeters back.

Don't trust other brands' charts

Sizing differs by maker. Measure fresh for BooBoos — don't assume what worked for another seller works here.

Flat nail beds need a tweak

If your natural nails are flatter than curved, pre-shaped Booboos can read too wide at the edges. Pick your width and lightly file the base or sides for a flush fit.

Still uncertain?

Order our Custom Sizing Kit — we'll ship blank shells in every size so you can find your exact fit. We save your sizes for every future order.