How wide is a king bed？

Author : James Madison | Published On : 14 Jul 2026

A standard king size mattress is 76 inches wide. It is about 193cm. It’s wide is taller than most people. It is enough wide for a couple sleep with their baby.

A standard king-size mattress measures 76 inches × 80 inches, or approximately 193 cm × 203.2 cm. This is a large bed that requires a spacious room to accommodate it. The mattress base should be 2–3 cm larger than the standard mattress dimensions. Therefore, if you want to purchase a wooden bed frame for a king-size mattress, it should measure approximately 195 cm × 206.2 cm.

If you’d like to learn about the dimensions of other extra-large mattresses, including California King, Texas King, Wyoming King, Alberta King, and Alaska King, please refer to the following mattress size chart:

Mattress	Wide(inch)	Length(inch)	Size(CM)	Bed Size(inch)
California king	72	84	183 x 213.36	75–79" x 87–89"
Texas King	80	98	203 x 249	83–84" x 101–103"
Wyoming King	84	84	213 x 213	87–88" x 87–88"
Alaska king	108	108	274 x 274	111–112" x 111–112"
Alberta King	96	96	244 x 244	100–102" x 100–102"

Different mattress sizes require different bedroom sizes. For a king-size mattress, we recommend a room measuring 12 feet × 12 feet, which is approximately 366 centimeters × 366 centimeters. For detailed information on mattress sizes and related materials, please refer to this article—Sleepmax Mattress Size Chart. The article covers all mattress sizes, along with corresponding bed frame sizes and room dimensions. Each mattress size also includes recommendations on who it is best suited for.