Miracle Sheets Size Guide

Miracle Sheets come in seven sizes and twelve colors, and every set holds the same four pieces. The fitted sheet is cut for deep mattresses, up to 17 inches, which covers most pillow-top and memory-foam beds that ordinary sheets pop off during the night. The measurement that decides whether a set fits is depth, not width.

Which size for which bed

• SizeMattress dimensions
• Twin38" × 75"
• Twin XL38" × 80"
• Full54" × 75"
• Queen60" × 80"
• King76" × 80"
• California King72" × 84"
• Split KingTwo 38" × 80" halves

Those are the standard US mattress dimensions rather than measurements taken off the sheets. Use them to identify your bed, then order the matching size.

The depth question

Measure from the top surface of the mattress down to where it meets the base, and include any topper you sleep on, because the fitted sheet has to go over both.

Under 17 inches and you are fine. At 17 you are at the limit, and a thick topper is what tips a bed over it. If you measure 18 or more, no standard fitted sheet is going to hold the corners. A sheet that is too shallow does not just look untidy, it pulls free in the night, which is the most common reason people send bedding back.

When you need Split King rather than King

Split King is for adjustable bases that move each side independently. Instead of one wide fitted sheet you get two, one for each half.

If you have a King mattress on a fixed frame, order King. If you have two Twin XL mattresses on an adjustable base, order Split King, because a King fitted sheet on that bed binds the two halves together and stops them articulating.

What comes in a set

One fitted sheet, one flat sheet and two pillowcases, all in the same cloth: long-staple cotton at a 300 thread count, finished in a sateen weave, with silver ions woven into the fibers and an OEKO-TEX certification on the fabric. Split King is the exception, with two fitted sheets instead of one.

Three things that catch people out

1. Measuring the frame instead of the mattress. The sheet goes over the mattress, so the frame is irrelevant to the fit.
2. Forgetting the topper. A two-inch topper on a 15-inch mattress puts you at 17, right on the limit.
3. Assuming every color exists in every size. Twelve colors are offered across the range, but availability varies. Check the shade you want is in stock in the size you need before you commit.

Quick answers

• Do Miracle Sheets fit a 16-inch mattress?Yes. The fitted sheet is made to fit up to 17 inches.
• Is Split King the same as two Twin XL sets?Close, but not identical. A Split King set gives you two fitted sheets plus one flat sheet and two pillowcases, where two Twin XL sets would give you duplicates of everything.
• What if my bed is between sizes?Order the larger one. A slightly loose fitted sheet is livable, a tight one will not stay on.
• Do they shrink?Wash cold and tumble dry low and shrinkage is minimal. Hot water is what shrinks long-staple cotton.