Column · No.03 · Sizing

Left and Right Hands Are Different Sizes Here's how to order press-on nails for each

It's completely normal for your left and right hand to need different press-on nail sizes. Why the dominant hand often runs wider, which fingers show it most, and how to order each hand separately.

4 min read•Published September 14, 2026•écrin nail studio

Walnut press-on nail set by écrin nail studio

“My right hand fits perfectly but the left keeps lifting” is something we hear often enough that it is worth saying plainly: it is completely normal for your two hands to need different sizes. We collect ten separate numbers for every order — five per hand — for exactly this reason.

Different hands, different widths — this is normal

Just as hands are rarely perfectly symmetrical in size, nail width usually is not either. The difference is typically small — 0.5 to 1mm, or about one size number on our chart — which sounds trivial until you remember that 0.5mm is often the entire margin between a snug fit and a visible gap. Assuming both hands match is the single most common sizing mistake we see.

	Left hand	Right hand
Index	size 6	size 5
Pinky	size 8	size 7

A one-size-number gap like this is common and will show clearly if you order a single set of numbers for both hands.

Three reasons hands differ

Reason	What it looks like
Your dominant hand	The hand you write and grip with tends to develop a very slightly broader nail bed over time
A past injury or habit	A nail that was once jammed in a door, or a history of nail-biting on one side, can permanently change its shape
Simple bone structure	If one hand's fingers are naturally a touch thicker, the nail width follows

None of these are a problem to correct — they are just facts to measure around. Once you accept both hands as separate, sizing them individually is the whole solution.

Which fingers show it most

Index finger — often a size larger on the dominant hand
Pinky — the narrowest nail, so the same 0.5mm gap moves it a full size number more often than on wider fingers
Thumb — the widest nail and the one where a measuring mistake is easiest to make
Middle and ring fingers — usually the most consistent hand to hand

Ordering different sizes per hand

Our product page asks for five numbers for your left hand and five for your right, entered separately — there is no extra charge for this, it is simply how every order works.

Step	What to do
1	Measure all ten fingers, or check all ten against the Sizing Kit (+$12)
2	Enter the left-hand and right-hand numbers separately at checkout
3	When a finger falls between two sizes, choose the larger one (lower number)

Already ordered the same number for both hands?

Result	What you can do
One hand feels loose or overlaps the skin	Fixable — file both edges down about 0.5mm
One hand shows natural nail at the side	Not fixable — note the correct number for next time and size up
Fits but still lifts	Check your application method rather than the size — see our applying & removing guide

Because every set is painted to order for the numbers you give us, a mismatch between your two hands caused by ordering one number for both is treated as a sizing choice rather than a fault. See returns & exchanges for what we can still do — usually a half-price remake or a free sizing kit for next time.

Quick answers

Do press-on nails really need different sizes for each hand?

Usually, yes. The difference is typically 0.5–1mm — about one size number — and it's most often the dominant hand's nails that run very slightly wider.

Which fingers are most likely to differ side to side?

The index finger (often larger on your dominant hand) and the pinky, where even a 0.5mm gap is enough to shift a full size number because the nail itself is so narrow.

Can I order different sizes for my left and right hand?

Yes — our order form asks for five numbers per hand, entered separately, at no extra cost. If you're not sure of your numbers, the Sizing Kit (+$12) lets you check all ten fingers before ordering.

I ordered one size for both hands and it doesn't fit evenly — now what?

If a finger is loose, you can file both edges down by about 0.5mm. If a finger is too small, that can't be corrected after the fact — note the right number and size up on your next order.