Queen and king bunkie boards are the same length — the entire difference is 16 inches of width. Order by the wrong number and the board either hangs over the frame or leaves a strip of mattress unsupported. Here's the 60-second check, plus the split-king exception that catches people.

The Key Dimensions

Size	Dimensions (W × L)	Fits
Queen Bunkie Board	60″ × 80″	Standard queen mattress and queen bed frame
King Bunkie Board	76″ × 80″	Standard king mattress and king bed frame
California King	72″ × 84″	California king — narrower and longer than standard king

The most important thing to note: queen and king boards are the same length (80 inches) but different widths. The king is 16 inches wider. Don't measure your frame — measure your mattress.

How to Tell If You Have a Queen or King Mattress

The easiest way: check the label sewn into the side of your mattress. It will state the size. If the label is gone, measure the width:

• ~60 inches wide = Queen
• ~76 inches wide = King
• ~72 inches wide = California King (different again — longer and narrower than standard king)

⚠️ Don't Measure the Frame: Bed frame inner dimensions vary by manufacturer. Two queen frames from different brands can differ by 1–2 inches. Always measure the mattress itself — mattress sizes are standardised. (Full measuring method, all 8 sizes, and the one exception in our complete size guide.)

How Queen and King Boards Ship

At these widths, both sizes ship as two folding panels that unfold and seat together edge to edge — one continuous surface with no gap between them. That's what makes a 76-inch board fit through your stairwell and installable by one person, half the bed at a time.

Which Is More Popular?

Queen is by far the more common size in the US — roughly 60% of American households have a queen bed. King beds are more popular in master bedrooms where space allows.

What About Split King?

A split king is two twin XL mattresses placed side by side — often used with adjustable bases so each partner can adjust their side independently. For a split king setup, you would need two Twin XL bunkie boards rather than a single king board — each side stays independent, which is the point of the split. Details in our Twin vs Twin XL guide.

Choosing Between Slim and Heavy-Duty

Once you've confirmed your size, choose between our two board types:

• Slim (0.4″) — the right choice for most beds. A fluted polypropylene core that's rigid across slat gaps up to 8 inches yet breathable through internal air channels, wrapped in 600D Oxford fabric with a non-slip base. Adds no meaningful height, folds light enough for one person, silent. Available in both Queen (60″×80″) and King (76″×80″) — our most popular line.
• Heavy-Duty (0.6″) — a reinforced wood-composite core in waterproof 600D Oxford fabric, built at 42 lbs for maximum rigidity. The queen version measures 58″×80″. Best for heavier mattresses, combined sleeper weight over 300 lbs, very wide slat gaps where extra stiffness helps, or doing double duty under a sleeper sofa mattress. One honest caveat: at that weight it's made to be installed once and left in place — not for setups you fold and unfold daily.

The One We Make

Whichever size you land on, the slim board's build is the same: 0.4 inches thick, moisture-proof fluted core that can't warp or mold, sewn fabric edges, textured non-slip base that ends slat squeaks and mattress sliding. Unfolds in about 2 minutes, no tools.

ℹ️ The Bottom Line: Same length, 16 inches of width apart. Check the mattress label or measure the width: 60″ → Queen, 76″ → King, 72″ → Cal King, two Twin XLs → split king. Then pick slim for most beds, heavy-duty for maximum rigidity — and either way it's flat by tonight.

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