what are the dimensions of a king size mattress

A standard king size mattress typically measures 76 inches wide by 80 inches long (about 193 cm by 203 cm).

Quick Scoop

For most modern beds in the U.S. and Canada, when someone says “king size mattress,” they mean:

• Width: 76 inches
• Length: 80 inches
• In centimeters: roughly 193 cm × 203 cm

Multiple mattress size charts and brand guides list these same king dimensions, with only tiny variations of about plus or minus half an inch depending on the manufacturer.

If you’re comparing sizes, a king is wider than a queen (60 × 80 inches) and shorter but wider than a California king (72 × 84 inches).

Mini FAQ

• Is every king mattress exactly 76 × 80?
  Not always; major brands note that measurements can vary by about 0.5 inch either way.

• Is this the same as “Eastern king”?
  Yes, in most U.S. size guides, “Eastern king” is just another name for the standard 76 × 80 inch king.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.