Enter your height, number of sleepers, and sleeping style to find your ideal bed size. The Bed Size Calculator recommends the best mattress size for you — from Twin to California King — and shows the exact dimensions in both inches and centimeters.
Recommended Bed Size
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Dimensions (inches)
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Dimensions (cm)
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Minimum Bed Length Needed
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Comfortable Bed Length
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Room Fit
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If you're 6'0" (183 cm) tall, the general rule is to add at least 8 inches (20 cm) to your height for comfortable legroom. That means you need a minimum bed length of 80 inches — a Queen, King, or California King all work well. A Twin XL (80 in) is the smallest size that would comfortably fit you.
Add at least 8 inches (20 cm) to your height to find the minimum mattress length you need. For width, consider how many people will sleep in the bed and how much you move around. Finally, make sure to leave at least 2 feet of clearance around the bed in your bedroom.
A Queen bed measures 60 × 80 inches (152 × 203 cm), while a standard King measures 76 × 80 inches (193 × 203 cm). A King is 16 inches wider, giving couples significantly more personal space. A California King is slightly narrower (72 in) but longer (84 in), making it ideal for taller sleepers.
A 60 × 80 inch mattress is a Queen size bed. It's the most popular mattress size in the US, offering enough room for couples while fitting comfortably in most standard bedrooms (recommended minimum room size: 10 × 10 ft).
A Queen (60 × 80 in) is the minimum recommended size for couples, providing each person roughly 30 inches of personal space. A King (76 × 80 in) is ideal if both partners are active sleepers or if you share the bed with pets or children.
The California King is the longest standard mattress at 72 × 84 inches. If you're looking purely for width, the standard King at 76 × 80 inches is actually wider. Some manufacturers offer Wyoming King (7 × 7 ft) or Alaskan King (9 × 9 ft) as oversized non-standard options.
Yes — Full and Double are two names for the same mattress size: 54 × 75 inches (137 × 190 cm). It's a popular choice for single adult sleepers who want more room than a Twin, but it can feel cramped for two adults.
As a general guide: Twin needs at least 7 × 10 ft, Full needs 9 × 10 ft, Queen needs 10 × 10 ft, and a King needs 12 × 10 ft. Always leave at least 2 feet on each side of the bed for comfortable movement and furniture placement.