US California King vs JP King (Wide Double)
Detailed size comparison between US California King and JP King (Wide Double). See the dimensions side-by-side to ensure you buy the right mattress.
Visual Size Comparison
The US California King is roughly 3% larger than the JP King (Wide Double).
⚠️ Warning: Fitted sheets designed for the King (Wide Double) likely won't fit the California King accurately.
Why comparing mattress sizes matters
International sizing standards vary significantly. A "King" in the US is not the same as a "King" in the UK or Australia. Mistaking these can lead to purchasing bedding that doesn't fit or rugs that look awkward in your space.
Quick Rule of Thumb:
US sizes tend to be wider and longer than their UK/EU counterparts. Always check the CM measurements before buying fitted sheets or frames.
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