King Size Bed Dimensions Guide (2025) – Inches, Feet & CM

Mastering Comfort: Your Complete Guide to King-Size Bed Dimensions & Mattress Buying

A restful night starts with the right sleep setup, and for many, a king-size bed is the gold standard in comfort and space. Whether you’re upgrading from a queen or revamping your master bedroom, understanding king-size bed dimensions, mattress types, and room requirements is essential. At XYUltra.com, we bring you a complete guide to help you make an informed, confident choice.

King-Size Bed Dimensions: The Basics

A standard king-size mattress measures 76 inches wide by 80 inches long, equivalent to 6 feet 4 inches by 6 feet 8 inches (193 cm x 203 cm). It offers maximum sleeping space for couples, families who co-sleep, or individuals who love to sprawl.

Unlike smaller beds, a king mattress drastically reduces sleep disturbances due to movement. It’s a great option for sleepers who value room to shift positions freely or need to accommodate kids or pets.

King Bed Frame Dimensions: Don’t Overlook the Fit

Choosing a king-size bed frame requires additional planning. Most frames extend 2 to 5 inches beyond the mattress to support the structure. This puts total frame dimensions between 78–82 inches wide and 82–86 inches long, depending on the frame’s material and design.

Pro Tip: Always measure your bedroom space before buying. We recommend a minimum room size of 12×12 feet to ensure enough clearance for furniture and movement around the bed.

Foam Hybrid Mattress: The Sweet Spot in Sleep Technology

One of the most popular choices today is the foam hybrid mattress—a perfect blend of pressure-relieving memory foam and supportive pocket coils. This structure offers:

• Excellent motion isolation
• Targeted lumbar support
• Cooler sleep experience

Top-rated hybrid options like the Brooklyn Bedding Signature, Amerisleep AS2 Hybrid, and Allswell Mattress provide varying firmness levels, making them ideal for different sleep styles—from side sleepers to those who need firm back support.

Mattress Buying Checklist

Before purchasing your king-size mattress, consider these key factors:

• Room Access: Can the mattress fit through your stairwell and doorway?
• Sleeping Position: Soft for side sleepers, firm for back/stomach sleepers.
• Budget: Compare high-end models with budget-friendly alternatives.
• Return Policy & Warranty: Look for brands offering at least a 100-night trial and a 10-year warranty.

King-Size Bedding Dimensions

Your mattress isn’t complete without the right bedding. Standard king-size bedding dimensions include:

• Fitted Sheet: 76 x 80 inches
• Flat Sheet: 108 x 102 inches
• Comforter/Duvet: 102 x 86 inches

If you’re using a California king mattress, these measurements will slightly vary, particularly in length.

Why Shop at XYUltra?

At XYUltra.com, we make choosing the best king mattress easy. Whether you want luxury comfort or practical support, we stock a wide range of foam hybrid mattresses, bed frames, and accessories—all carefully selected to improve your sleep quality and bedroom design.