Everyday Life Calculators

Bed Size Comparison Calculator

Compare the total sleeping area of two standard US mattress sizes.

First bed area —

Second bed area —

Area difference —

About the Bed Size Comparison Calculator

Standard US mattress sizes vary considerably in total sleeping area, not just width — a King is wider than a California King, but the Cal King is longer.

Formula: Area (sq ft) = (Width in inches × Length in inches) ÷ 144

Useful for deciding between mattress sizes when upgrading, or figuring out how much more (or less) room a size change will give you.