King Size Mattresses
Looking for a king size mattress?
You’re in the right place. In this guide, we’ll cover everything you need to know about king size bed dimensions, how they compare to other mattress sizes, and tips for choosing the best king bed for your needs.
What are the dimensions of a King size mattress?
A standard king size mattress measures 76 inches wide by 80 inches long (193 cm x 203 cm). It’s the widest standard mattress size available, offering plenty of space for couples — or anyone who loves extra room to stretch out.
Key benefits of a king mattress:
- Spacious enough for couples and kids or pets
- Helps minimize sleep disruptions from a restless partner
- Ideal for primary bedrooms with ample space
Is a King Size bed right for you?
Choosing the perfect mattress size is essential for a restful night’s sleep, and a king size bed is often the ultimate choice for space and comfort. But before you invest, ask yourself:
- A king mattress requires ample floor space to fit comfortably without overcrowding.
- King size mattresses provide plenty of room to stretch out, ideal for restless sleepers or those who prefer personal space.
- If your furry friends or little ones often join you at night, a king size bed offers enough space for everyone to sleep peacefully.
- Many king mattresses include advanced support systems and cooling technologies designed for larger sleeping surfaces.
If you answered yes to any of these, a king size mattress could be the best investment in your sleep comfort and overall bedroom experience. With extra width and length, it’s perfect for couples, families, or anyone who values space and luxury in their sleep setup.
Shop King Size Mattresses
At Diamond, you’ll find king size mattresses designed for cooling comfort, pressure relief, and spinal alignment. Choose from hybrid, latex, or memory foam options to suit your sleep style.
Dreamstage
Features copper-infused memory foam to keep you cool, clean, and comfortable. Copper naturally pulls heat away for cooler sleep and helps fight bacteria, so your mattress stays fresher, longer.
Available in King size and other popular sizes, in Quilted Hybrid, Hybrid, and All-Foam options — and in Firm, Medium, or Plush comfort levels.
Black Diamond
Features luxury cooling from every layer — combining a breathable CoolTouch cover, Ice Flex Cooling Band Technology, and infused memory foam to deliver all-night temperature regulation and refreshing comfort.
Available in King size and other popular sizes, in Quilted Hybrid, Hybrid, and All-Foam options — and in Firm, Medium, or Plush comfort levels.
Dreamstage Value
Delivers premium comfort and support at a price that fits your budget. Featuring CertiPUR-US® high-density memory foam layers for pressure relief and durability, plus our Dynamic Edge Coil System for targeted support and lasting stability.
Available in King size and other popular sizes, in Quilted Hybrid and Lux Quilted Hybrid options — and in Firm, Medium, or Plush comfort levels.
Flurry Lux
The Flurry Lux mattress is a premium hybrid designed for exceptional cooling performance, featuring Coolstream Lux Cooling Fabric and highly conductive graphene foam. In fact, Naplab found the Flurry Lux to be one of their highest-scoring hybrids tested to date!
Available in King size and other popular sizes, in Medium and Firm comfort levels.
Ethos
Combines performance and sustainability with natural, eco-friendly materials for deeply restful sleep. Talalay latex delivers responsive bounce and weightless pressure relief. HD comfort foams gently contour to your body to enhance circulation, while the 7 Series pocketed coils reduce motion transfer for undisturbed sleep. Dynamic edge coils add extra support and durability for proper spinal alignment and all-night comfort
Available in King size and other popular sizes, in Plush, Medium, and Firm comfort levels.
FAQs
A standard king is wider (76" vs 72") while a California king is longer (84" vs 80").
Measure your hallways and stairs — most king mattresses can bend slightly but check dimensions before delivery.
Many modern king mattresses work well with a platform bed, slats, or an adjustable base — a box spring is optional but can add height and support.
