A king-size bed measures 76 inches wide by 80 inches long, making it the widest standard mattress size available. It is suitable for couples and individuals who want more space. However, owning a king-size bed requires a higher budget and a bigger bedroom than a smaller mattress does. The California king bed is narrower and longer than the standard king, measuring 72 inches wide by 84 inches long. It is suitable for taller individuals. The total surface area of a king-size mattress is larger than that of a California king, but the latter provides greater length. Both sizes can accommodate couples comfortably, and they also come with a split option for partners with different mattress preferences