Fitted Sheet Sizes Explained: Single, Double, King & Super King Guide

Nothing ruins a good night's sleep faster than a fitted sheet that pops off the corners at 3 AM. The culprit? Usually, it's the wrong size. Fitted sheet sizing can be surprisingly confusing — different countries use different standards, mattress depths vary, and labels don't always tell the full story. This guide breaks down everything you need to know about fitted sheet sizes so you can find the perfect fit for every bed in your home.

Why Fitted Sheet Size Matters

A properly fitting fitted sheet does more than stay in place. It creates a smooth, wrinkle-free sleeping surface that's comfortable and looks neat. Sheets that are too small will pull off the corners. Sheets that are too large will bunch up underneath you. Either way, you're losing sleep quality.

Getting the right size also extends the life of your sheets — a sheet under constant tension from being too small will wear out and tear faster along the elastic edges.

Standard Fitted Sheet Sizes

Single / Twin

Double / Full

King

Super King

US vs UK vs EU Sizing

Important: Always check the exact measurements on the product listing rather than relying on size names alone. A "King" in the UK is not the same as a "King" in the US!

Don't Forget Mattress Depth

One of the most overlooked factors when buying fitted sheets is mattress depth (also called mattress height or pocket depth). Standard mattresses are typically 20–25 cm deep, but many modern mattresses — especially memory foam and pillow-top models — can be 30–40 cm deep.

How to Measure Your Mattress Depth

Common Pocket Depths

If your sheets keep popping off, your mattress is likely deeper than the sheet's pocket. Try a deep-fit or extra-deep fitted sheet instead.

Choosing the Right Fitted Sheet Material

Microfiber — Affordable, wrinkle-resistant, and ultra-soft. A practical choice for everyday use. Especially popular for rental properties and kids' rooms.

Cotton — Breathable and natural. Gets softer over time and ideal for all-season comfort.

Cotton-Polyester Blend — Combines the breathability of cotton with the durability and wrinkle-resistance of polyester. A great middle ground.

How to Keep Fitted Sheets in Place

Fitted Sheet Buying Checklist

Shop the Right Fit

At AYSW, our fitted sheets come in all standard sizes — Single, Double, King, and Super King — with clearly listed dimensions and pocket depths. We use quality microfiber and cotton-blend fabrics with all-around elastic for a secure, comfortable fit every night.

No more guessing. No more 3 AM sheet battles. Just smooth, perfectly fitting sheets that stay where they belong.

Wrapping Up

The key to finding the perfect fitted sheet is simple: measure your mattress, match the dimensions, and check the pocket depth. Don't rely on size names alone — a quick measurement takes 30 seconds and saves you the hassle of returns and restless nights.