Bedding Size Guide: Twin to California King

Buying bedding should be simple, but mattress sizes, sheet depths, and comforter dimensions don't always line up the way you'd expect—and a comforter that's too small or a fitted sheet that won't stay put can undo an otherwise perfect bed. This guide lays out every standard mattress size from Twin to California King, the sheet and comforter dimensions that pair with each, and how to account for deep mattresses and the "drop" you want hanging over the sides. Use it to order with confidence and get that hotel-crisp, well-dressed look every time.

Standard Mattress Dimensions

Bedding is sized to fit standard mattresses, so start by confirming your mattress size. Here are the U.S. standard dimensions:

Mattress Size	Dimensions (W x L)	Best For
Twin	38" x 75"	Kids' rooms, single sleepers, bunk beds
Twin XL	38" x 80"	Taller single sleepers, dorm rooms
Full (Double)	54" x 75"	Solo adults, guest rooms
Queen	60" x 80"	Couples, most primary bedrooms
King	76" x 80"	Couples wanting maximum width
California King	72" x 84"	Tall sleepers, longer rooms

Note the difference between King and California King: a King is wider (76") but shorter (80"), while a Cal King is narrower (72") but four inches longer (84"). They are not interchangeable—sheets and comforters are cut differently for each, so always buy bedding labeled for your exact size.

Matching Sheets to Your Mattress

A sheet set includes a fitted sheet, a flat sheet, and pillowcases. The fitted sheet is the one to watch, because modern mattresses vary widely in thickness.

Check the pocket depth. The fitted sheet's "pocket" needs to be deep enough to wrap your mattress—including any topper. Standard fitted sheets fit mattresses up to about 12 inches. If you have a pillow-top or a mattress plus a topper (14–18+ inches), look for deep-pocket or extra-deep-pocket sheets. Measure your mattress height before buying to avoid corners that pop off overnight.

Flat sheets run larger than the mattress on purpose, so they can be tucked in on the sides and folded over the top. If you like a generous tuck, size up to the next flat-sheet size.

Choosing the Right Comforter or Duvet Size

Here's where many people go wrong: comforters are sized for coverage and drape, not to match the mattress footprint exactly. You want enough overhang—the "drop"—to cover the sides of the bed and any topper. As a rule, aim for 10–12 inches of drop on each side and at the foot.

Mattress Size	Recommended Comforter/Duvet (W x L)
Twin / Twin XL	68" x 88"
Full / Queen	88" x 90" to 90" x 90"
King / California King	104" x 90" to 108" x 92"

Full and Queen comforters are often sold in one shared size, which works because a Queen only needs a little more drop than a Full. King and Cal King frequently share a comforter size as well—the extra width of the King and the extra length of the Cal King roughly even out. If you prefer a deep, luxurious drape, size up one increment.

Pillows and Shams

Round out the bed with the right pillow sizes for each mattress:

• Standard pillows (20" x 26"): Two fit a Twin, Full, or Queen bed.
• King pillows (20" x 36"): Two span a King or Cal King bed.
• Euro shams (26" x 26"): Square accent pillows that layer behind sleeping pillows for a designer, propped-up look.

A classic dressed bed uses two sleeping pillows, two to three Euro shams behind them, and a lumbar or accent pillow in front.

Building a Complete Bed

For a polished, layered result, work from the mattress up: fitted sheet, flat sheet, then a quilt or blanket, topped by the comforter or a duvet-covered insert, and finished with shams and accent pillows. Coordinating your layers within a single collection makes mixing patterns and textures foolproof.

Shop everything by size in our bedding collection, or go straight to your mattress size: Twin, Queen, King, and California King bedding.

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