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Last updated: March 2026

What Size Window Do I Need for a Mattress?

Mattresses are flexible and only 8–14" thick on edge. Most windows handle them — the opening just needs to exceed the mattress thickness.

WINDOW SIZEMATTRESSFLEXIBLE

Whether it fits depends on measurements most people get wrong.

Key Measurement

Mattress thickness (8–14") on edge = minimum window width. Flexible — bends to fit shorter openings.

Standard Dimensions

Item: King: 76"×80"×10–14". On edge through window: 14" wide × 76–80" height (bendable).

Space: Any window wider than 16" works. Standard: 32"×52" — plenty of room.

Actual clear openings are usually 1–2″ smaller than the labeled size.

Your exact dimensions probably aren't "standard." Small measurement errors cause big problems — 1 inch can be the difference between fitting and getting stuck.

Verdicts are calculated by comparing all 6 item orientations against the space dimensions using verified building code standards. See our methodology

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Related fit checks

How Wide Does a Hallway Need to Be for a Mattress?Find the minimum hallway width for a mattress. Stand it on edge (8–14 inches wide) and even the narrowest hallways work.How Wide Do Stairs Need to Be for a Mattress?Find the minimum stair width for a mattress. Mattresses flex and stand on edge — even king mattresses fit most standard stairways.What Size Elevator Fits a Mattress?Find the minimum elevator size for a mattress. Stand it on edge — a king mattress needs 80 inches of ceiling height and 14 inches of floor width.Will a Mattress Fit Through a Window?Check if your mattress will fit through a window opening. Covers king, queen, full, and twin sizes — window removal, bending foam mattresses, and hoisting.Will a Queen Mattress Fit in a Cargo Van?Check if a queen mattress will fit in a cargo van. Compare cargo dimensions for Sprinter, Transit, ProMaster, and rental vans.

What to Measure

1Mattress thickness — 8–14" on edge; this is the minimum window width needed
2Mattress width — king: 76", queen: 60". This is the height dimension when on edge; window must be tall enough or mattress must bend
3Window opening dimensions — measure clear opening with sash removed

Common Mistakes to Avoid

Trying to push a mattress through flat — fold or roll it (for memory foam) or stand it on edge to minimize the dimension facing the window
Forgetting mattress-in-a-box won't recompress — if you unrolled a bed-in-a-box, it won't go back in the box; it must go through the window at full size
Not using a mattress bag — the window frame, sill, and brickwork will scrape and tear the mattress cover; use a bag

Frequently Asked Questions

What window size for a king mattress?

A king mattress on edge is 10–14" thick — any window opening wider than 16" works. The mattress width (76") can be bent to fit through shorter windows. Standard double-hung windows handle all mattresses.

Can a mattress be hoisted without professionals?

For second-floor windows, many people successfully hoist mattresses with rope and a helper above/below. Above the second floor, hire professionals. Mattresses are light (80–150 lbs) but awkward in wind.

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