What Size Silk Pillowcase Do I Need? (US Standard/Queen, King)
For most pillows in the US, you want the Standard/Queen size, about 20 × 29.5 in — the size the great majority of American pillows take. If you sleep on a longer King-size pillow, you'll want the King size, about 20 × 35.4 in instead. The golden rule cuts through any confusion: measure your pillow (or read its tag) and match the case, because a silk pillowcase should fit snugly, not loose. Here's how to get it right.
What size silk pillowcase do I need?
In the US, the safe default is Standard/Queen (≈ 20 × 29.5 in), because that's the size of a standard or queen pillow — the one most American beds come with. Reach for the larger King size (≈ 20 × 35.4 in) only if you know your pillows are the longer king variety, used across a king-size bed. When in doubt, Standard/Queen is the one that fits most people here — but the only way to be certain is to measure, which takes ten seconds.
US pillow and pillowcase sizes, explained
Pillow sizing can be confusing across brands, so here's the plain version for our pillowcases specifically. A standard or queen American pillow is roughly 20 × 26–30 in, and the case made for it is what we call Standard/Queen (≈ 20 × 29.5 in) — one size that comfortably fits both standard and queen pillows, which is why we offer it as a single option rather than splitting hairs between the two. A King pillowcase (≈ 20 × 35.4 in) fits the longer king pillows some people use across a king bed. The lesson: don't shop by the bed size alone — measure or check your pillow's own tag, since "queen" can describe either the bed or the pillow, and the inches are what matter.
How to measure your pillow
It's the surest way to choose, and it's quick. Lay the pillow flat and measure it edge to edge: the shorter side is the width, the longer side the length, in inches. If the pillow is very plump, measure it as it sits rather than squashing it flat, since a fuller pillow effectively needs a touch more room. Compare your two numbers to the case sizes above and pick the closest match. Easier still, many pillows have the size on their care tag — a glance there often settles it without a tape measure at all.
Why a snug fit matters with silk
Size matters more with a silk pillowcase than you might think. Too large and the case slides and bunches on the pillow through the night, so the smooth surface your hair and skin are meant to glide over keeps shifting and rucking up — undoing the very benefit you bought it for. Too small and you'll fight to get the pillow in, and the case sits strained and is more likely to wear at the seams. A well-matched case sits smooth and stays put, which is exactly what makes silk feel so good against your face. (If you're also choosing between an envelope or zip closure, that affects how snugly a fuller pillow sits, too.)
Getting the right size, the easy way
Put together, it's simple: in the US, choose Standard/Queen (≈ 20 × 29.5 in) unless you've measured and found your pillows are the longer king length. Match the inches, not just the bed size; favor a snug fit; and check the size on the product page before you buy. And remember the quality underneath matters most — a perfectly-sized case is only worth having if it's genuine 22-momme mulberry silk.
Our LS Silk US mulberry silk pillowcases come in Standard/Queen and King sizes, each clearly measured on the product page — 22-momme, 100% mulberry silk and OEKO-TEX certified, so you can match the fit to your pillow with confidence.
Sizing a silk pillowcase, then, comes down to one habit: trust the measurements, not assumptions about your bed size. Measure your pillow, choose Standard/Queen if you're like most people here, and you'll have a case that lies smooth and does exactly what good silk is meant to do.