What Size Sheets Do I Need? A Complete Bed Sheet Size Chart
TL;DR: Sheet size follows your mattress size, not your bed frame. Twin is 38" x 75", Queen is 60" x 80", King is 76" x 80", and California King is 72" x 84" — narrower and longer than a standard King, which is where most people go wrong. Once you have the size right, the measurement that actually decides whether a fitted sheet stays on is pocket depth.
Buying sheets should be simple. You know your bed is a Queen, so you buy Queen sheets. Most of the time that works, and then occasionally it does not — the corners pop off at 3 a.m., or the flat sheet is too short to tuck, or the set you ordered for a King bed turns out to have been made for a California King.
Sizing is standardized enough to be predictable, but there are a few places where the labels are genuinely confusing. Here is the full chart, plus the two measurements worth checking before you order.
Start With the Mattress, Not the Frame
Bed frames vary. A Queen platform bed, a Queen bed with a bulky upholstered surround, and a Queen frame with a footboard all take the same sheets, because the mattress inside them is the same size. Frame dimensions are irrelevant to bedding.
If you are not certain what size your mattress is, measure it. Width first, then length, then depth from the top surface down to the bottom edge — including a mattress topper if you use one. Those three numbers are all you need.
Standard Mattress Sizes
These are the US standard dimensions. Mattresses can run an inch off in either direction depending on the manufacturer, which is fine, because sheets are cut with tolerance built in.
| Size | Width x Length | Typically suits |
|---|---|---|
| Twin | 38" x 75" | Children's rooms, bunk beds, daybeds |
| Twin XL | 38" x 80" | Dorm rooms, taller single sleepers |
| Full (Double) | 54" x 75" | One adult with room to spread out, guest rooms |
| Queen | 60" x 80" | The most common size for two adults |
| King | 76" x 80" | Two adults wanting maximum width |
| California King | 72" x 84" | Taller sleepers; narrower rooms |
| Split King | Two Twin XL mattresses, 38" x 80" each | Adjustable bases, couples with different firmness needs |
King vs. California King
This is the mix-up that causes the most returns, and it is worth being precise about: a California King is not bigger than a King. It is four inches narrower and four inches longer.
| King | California King | |
|---|---|---|
| Width | 76" | 72" |
| Length | 80" | 84" |
| Total surface area | 6,080 sq in | 6,048 sq in |
| Best for | Couples, or sharing with kids or pets | Sleepers over about 6 feet tall |
The two are almost identical in total area — they just distribute it differently. And the fitted sheets are not interchangeable. A King fitted sheet on a California King mattress will be loose across the width and too short lengthwise. Pillowcases, however, are the same size for both.
Flat Sheet Sizes
Flat sheets are less standardized than fitted sheets, because how much overhang you want is partly a matter of taste. Someone who tucks tightly on all sides needs more fabric than someone who lets it drape.
| Size | Typical flat sheet dimensions |
|---|---|
| Twin | 66" x 96" |
| Twin XL | 66" x 102" |
| Full | 81" x 96" |
| Queen | 90" x 102" |
| King / California King | 102"–108" x 102"–108" |
Treat these as a starting point rather than a rule. Flat sheet dimensions vary noticeably between brands, so it is worth reading the actual listed measurements — especially if your mattress is deep, since a thick mattress eats into the overhang on both sides before you tuck anything.
Pocket Depth: The Measurement That Decides the Fit
Size gets you the right footprint. Pocket depth is what keeps the sheet on.
Mattresses have gotten considerably thicker over the past two decades. A standard mattress used to be around 9 inches; pillow-top and hybrid models now routinely run 14 to 18 inches, and adding a topper pushes that further. A fitted sheet built for a 10-inch mattress simply cannot grip a 16-inch one, no matter how correct the width and length are.
Measure from the top surface of your mattress straight down to where it meets the base, and include any topper. Then check that the fitted sheet's pocket depth meets or slightly exceeds that number. Our guide to deep pocket sheets walks through the measuring process and what to do if you land between sizes.
Split King and Adjustable Beds
A Split King is two Twin XL mattresses side by side, which means it takes two Twin XL fitted sheets rather than one King fitted sheet. Flat sheets and duvet covers, though, are usually bought in King size, since they sit above the split.
If the base articulates, a snug pocket depth matters more than usual — sheets that fit loosely will work themselves off the corners every time the head or foot section moves.
Pure Fiber Sheet Set Dimensions
Our Bamboo Viscose Sheets Set comes in Queen, King, and California King. Every set includes a fitted sheet, a flat sheet, and two pillowcases, in 100% bamboo viscose (rayon from bamboo viscose) with a 250-thread-count twill weave.
| Size | Fitted sheet | Flat sheet | Pillowcases |
|---|---|---|---|
| Queen | 60" x 80" x 17" | 90" x 102" | 21" x 32" |
| King | 78" x 80" x 17" | 104" x 106" | 20" x 40" |
| California King | 72" x 84" x 17" | 102" x 108" | 20" x 40" |
The 17-inch pocket covers the large majority of modern mattresses, including most pillow-top and hybrid builds with a topper added. If your mattress and topper together measure more than 17 inches, measure carefully before ordering.
If you are also weighing the fabric itself rather than just the fit, our comparisons of bamboo viscose vs. cotton and bamboo viscose vs. linen cover how the materials differ in feel and care, and what thread count actually means explains why the number on the package tells you less than you would expect.
Pillowcases and Duvet Covers
Pillowcase sizing runs on its own scale and does not always follow your mattress size — it follows your pillow. Standard cases fit standard pillows, King cases fit King pillows, and plenty of people use King pillows on a Queen bed. Our guide to Standard vs. King pillowcase sizes covers the difference, and extra bamboo viscose pillowcases are available separately.
Duvet covers are sized to the insert, not the mattress, which is why they are commonly sold in combined sizes. Our Bamboo Viscose Duvet Cover + 2 Shams Set comes in Full/Queen and King/Cal-King, and the duvet cover size guide explains how to match your insert and how much drape to plan for.
Frequently Asked Questions
What size sheets do I need for a Queen bed?
Queen sheets, sized for a 60" x 80" mattress. Check the pocket depth of the fitted sheet against your mattress thickness, including any topper.
Are King and California King sheets interchangeable?
Fitted sheets are not. A California King mattress is 72" x 84", while a King is 76" x 80", so a King fitted sheet will be loose across the width and short lengthwise. Pillowcases are the same size for both, and a King flat sheet will often work on a California King depending on how much tuck you want.
What size sheets go on a Split King?
Two Twin XL fitted sheets, one for each mattress. Flat sheets and duvet covers are typically bought in King size, since they sit above the split.
How do I know if I need deep pocket sheets?
Measure from the top of your mattress down to the base, including a topper if you use one. Anything over about 14 inches generally calls for a deep pocket fitted sheet. See our deep pocket sheets guide for the full process.
Do sheets shrink after washing?
Most sheets shrink slightly on the first few washes, which is why they are cut with a small allowance. Washing in cold water and tumble drying on low keeps shrinkage minimal — our bamboo viscose care guide covers the routine that keeps the fit and the fabric intact.
What size is a Full bed compared to a Queen?
A Full is 54" x 75" and a Queen is 60" x 80" — six inches narrower and five inches shorter. They are not interchangeable, and Full sheets are sometimes labeled Double.
Shop Pure Fiber bamboo viscose bedding in Queen, King, and California King.
