How Much Does a King Size Mattress Weigh? A Practical Guide

Understanding King Size Mattress Weight

When people ask, how much does a king size mattress weigh, the answer depends on several factors: the type of core (coil, foam, latex), the density and thickness of the foams, the cover materials, and any comfort layers like pillow tops. A standard king measures about 76 inches wide by 80 inches long (193 cm by 203 cm), but weight is not fixed by dimensions alone. Heavier cores and higher-density foams add mass, and the same model can vary by manufacturing batch. For homeowners and movers, knowing the weight helps with handling, choosing a compatible foundation, and planning safe transport. In this article, we break down typical ranges and show how design choices move the weight needle. Packaging adds to gross shipping weight, which matters for delivery and setup.

Weight Ranges by Mattress Type

Weight differences across mattress types are the biggest reason people see wide ranges. Here are typical king size ranges, expressed as rough guidelines rather than exact figures:

• Innerspring: 90–120 pounds (41–54 kg). These rely on coils and springs, which are lighter than dense foam but still provide robust support for most sleepers.
• Memory foam: 130–180 pounds (59–82 kg). High-density memory foams add substantial mass, especially in 10–14 inch profiles.
• Latex: 120–170 pounds (54–77 kg). Solid latex cores are dense and buoyant, offering durability but increasing weight.
• Hybrid: 110–150 pounds (50–68 kg). Hybrids combine coils with foam layers, typically landing between memory foam and latex in weight.
• Gel-infused memory foam (optional): 125–175 pounds (57–79 kg). Gel infusions add marginal weight due to added materials.

Note that these ranges assume standard 8–14 inch thickness and typical edge-to-edge support. Weight will vary with thickness, density (pounds per cubic foot), and cover fabric.

Thickness, Density, and Core Materials

Two levers move a king size mattress’s weight: thickness and material density. A thicker model (e.g., 12 or 13 inches) generally weighs more than an 8 or 9 inch version, all else equal. High-density foams (6 to 7 pounds per cubic foot) are heavier than lower-density foams (3 to 4 pounds per cubic foot). Coils add mass too, with more turns and heavier gauge steel contributing to higher weight in innerspring and hybrid designs. Latex cores are dense and heavy by design, while breathable covers (like fabric with moisture-wicking properties) add a modest amount of weight but can affect feel. For context, increasing thickness by about 2 inches can add several pounds per side, depending on the material. This interplay is why the exact weight is rarely uniform across brands and even across product lines within the same brand.

How to Estimate Weight for Shipping and Moving

When moving or shipping, the exact weight is sometimes not posted. Start by checking the retailer’s product specs for the “shipping weight” or “product weight.” If that data isn’t available, you can estimate using the mattress’s advertised dimensions and an approximate density for the core material. For example, memory foam typically ranges from 4 to 6 pounds per cubic foot; latex around 6 to 9 pounds per cubic foot; coils vary by gauge and count. Multiply the volume (width × length × thickness) by the density and convert to pounds. If you’re in a hurry, plan for a conservative estimate within the typical king size weight bands discussed earlier, and add the standard packaging weight for a bed-in-a-box or rolled model. Always account for the foundation or box spring, if included; foundations add substantial additional weight.

Weight and Foundation: Do You Need a Heavier Foundation?

Foundation and bed frames influence how weight is distributed and where it lands in a room. A sturdy platform or slatted foundation provides stable support, but it also adds to the overall mass you must move. If you’re replacing a mattress and foundation together, use the heaviest option as your baseline for a safe move. Most retailers list combined weights for sets, but if you’re buying separately, compute the foundation’s weight using its dimensions and material (wood, metal, or composite). In some cases, older foundations are lighter or heavier than newer ones, so verify compatibility with your frame and bed rails. In short, weight is a practical concern for transport and installation, not only for sleep comfort.

Practical Guide to Lifting and Moving a King Size Mattress

Move with a team of at least two people to reduce the risk of injury. Use a moving strap or dolly to keep the mattress stable and protect its surface. Encase the mattress in a plastic bag or mattress bag to prevent dirt or moisture from seeping in during transport. Lift with your legs, not your back, and avoid twisting while carrying. If you’re shipping, use the original packaging if available and choose a carrier that can handle bulky items. For heavier foam or latex models, consider a second person or professional movers. Lifting guidelines aren’t size-specific, but safety matters for any large mattress when moving up or down stairs.

Real-World Scenarios: Common Questions About King Size Weight

The phrase how much does a king size mattress weigh comes up in housing-market moving conversations, storage planning, and when selecting a compatible bed frame or foundation. You’ll often see weight differences across brands that share similar dimensions, which underscores the importance of checking exact product weights. For homeowners upgrading from a queen or full, expect a noticeable increase in heft but not a fixed rule. Always verify whether the model includes a foundation or pillow top, and remember that packaging adds to gross shipping weight. In many cases, retailers provide both the mattress weight and the total shipping weight for full transparency.

Quick Reference: King Size Weight by Type and Use

Below is a compact guide you can reference when comparing models or when discussing with movers. Use this as a starting point, not a guarantee, since actual numbers vary by brand and model.

• Innerspring: 90–120 lb
• Memory foam: 130–180 lb
• Latex: 120–170 lb
• Hybrid: 110–150 lb
• Gel-infused memory foam: 125–175 lb

These ranges help you plan for moving, storage, and installation, while reminding you to review the exact weight listed by the manufacturer on the product page.