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Quick answer
Amerisleep gives a California king as 72 by 84 inches, 42.0 square feet, for a room of about 12 by 12 feet. The Kartivo velvet bed with LED lights is listed at 90.6 by 92.5 by 45.9 inches and the Kartivo storage headboard bed at 90.5 by 80.5 by 31 inches. The Nectar bamboo bed lists a height of 12 inches, a weight limit of 500 pounds and no dimension table; the same Nectar design in queen lists 800 pounds. The widths of 92.5 and 80.5 inches are probably the headboard, so check where the width is measured.
Quick compare: the products in this guide
Sizes come from the Amazon listings as we read them; check the product page for the current details before you buy.
| Product | Listed details | Link |
|---|---|---|
| Nectar Bamboo Platform Bed Frame & Upholstered Headboard – California King -… | 500 lb; 12 in height (title) | See details on Amazon Affiliate link |
| Kartivo California King Bed Frame with Headboard, Upholstered Platform Bed,… | 90.6 x 92.5 x 45.9 in | See details on Amazon Affiliate link |
| Kartivo California King Bed Frame with Storage Headboard, Upholstered… | 90.5 x 80.5 x 31 in | See details on Amazon Affiliate link |
Worked example: margins and room
This is our own arithmetic.
| Bed | Listed width | Width minus 72 | Listed length | Length minus 84 | Footprint |
|---|---|---|---|---|---|
| Kartivo with LED | 92.5 in | +20.5 in | 90.6 in | +6.6 in | 58.2 sq ft |
| Kartivo storage headboard | 80.5 in | +8.5 in | 90.5 in | +6.5 in | 50.6 sq ft |
A footprint of 58.2 square feet in a 12 by 12 foot room (144 square feet) is 40 percent of the floor. The mattress alone is 42.0 square feet, 29 percent. If the 92.5 inch width is a wide upholstered headboard, the bed is much wider than the mattress at the head and only 72 inches at the sleeping surface.
In a 12 foot (144 inch) wide room, a bed 92.5 inches wide centered on a wall leaves (144 minus 92.5) divided by 2, which is 25.75 inches on each side. With a 20 inch nightstand on each side, that is 5.75 inches, so the nightstands barely fit.
Weight. The Nectar cal king lists 500 pounds. A cal king mattress of 90 pounds (an assumption) and two adults of 350 pounds together is 440 pounds, which is 88 percent of 500, little margin.
What the listings say
Nectar Bamboo Platform Bed Frame and Upholstered Headboard, California King, Walnut/Linen (ASIN B0DTZJBGZ3). The table gives bamboo wood, a color of natural, compatibility with a California king mattress and a maximum weight recommendation of 500 pounds; the title says a 12 inch height and floating center support legs. The page has no dimension table. Best for: a bamboo frame with a removable headboard. Watch out: the 500 pound limit is lower than the 800 pounds the queen version states, and the color row says natural while the title says walnut and linen.
Kartivo California King Bed Frame with Headboard, Upholstered Platform Bed, LED Lights, Charging Station, Gray (ASIN B0HG99GV6V). The table gives plywood, upholstered and velvet, a size of 90.6 by 92.5 by 45.9 inches and gray. The listing text we read is template wording and gives no weight or rating. Best for: nothing until the seller confirms the width. Watch out: 92.5 inches is 20.5 inches wider than the mattress, and the LED and charging station add power parts.
Kartivo California King Bed Frame with Storage Headboard, Upholstered Platform Bed, Beige (ASIN B0HGYRNT14). The table gives foam as the material, 90.5 by 80.5 by 31 inches and beige. The text we read states no weight, rating or storage size. Best for: a lower headboard with storage. Watch out: the material row says foam for a bed frame, which cannot describe the whole bed.
How the three compare
| Listing | Size (L × W × H) | Rating | Extras |
|---|---|---|---|
| Nectar bamboo | Not stated; 12 in height | 500 lb | Upholstered headboard, tool-free |
| Kartivo LED | 90.6 × 92.5 × 45.9 in | Not stated | LED, charging |
| Kartivo storage | 90.5 × 80.5 × 31 in | Not stated | Storage headboard |
Questions to ask
Ask where the width is measured, the assembled weight and rating, and for the two Kartivo beds the weight of the heaviest carton and the headboard’s storage size. For a bed this large, delivery weight and carton size matter.
How to choose
Do the room math. 40 percent of a 12 by 12 room for the widest bed.
Check the weight limit. 500 pounds leaves little margin for two adults.
Ask about the width. A 20 inch difference changes the plan.
Check the mattress size. A cal king is 72 by 84, not a king.
Delivery, assembly and odd sizes
A cal king bed is long, at 83.6 to 90.6 inches, so a carton can be over 7 feet. Measure the stairs and doors and ask the seller for the carton size. The Nectar listing says tool-free setup, which makes the bamboo bed the easiest to assemble. The two Kartivo listings give no assembly information in the text we read, and a bed with an upholstered headboard, LED lights or storage will need two people.
Checking a cal king listing in five steps
First, check that the table says California king and the mattress size 72 by 84. Second, check the width: if it is more than 80 inches, find out whether it includes the headboard. Third, check the weight rating and compare it with your load. Fourth, check for electrical parts and ask about the power supply. Fifth, check what the listing does not state, such as the weight of the heaviest carton, and ask. We found these five questions useful on the three beds above, none of which answered all five.
Alternatives
If you cannot find a cal king upholstered bed with clear numbers, consider a plain cal king frame and a separate headboard. A wall-mounted headboard in the right width, as in king size headboard (which also covers the cal king width), pairs with a steel frame like the Upcanso in cal king bed platform. That gives a cal king bed whose frame and headboard sizes you know.
Mistakes to avoid
Buying a king bed for a cal king mattress. A king is 76 by 80.
Reading the width as the mattress width. It includes the headboard.
Trusting the template text. It gives no features.
Skipping the power question. The LED bed has a charging station.
When a different bed is better
For cal king platform frames, see cal king bed platform and california king bed frame. For a cal king with storage, see california king platform bed with storage. For an upholstered queen, see bed upholstered.
Think also about the headboard’s role. A cal king headboard is wide and tall, and a wall-mounted one in 72 inches fits the mattress exactly. If the bed’s listed width includes wings or a wide upholstered headboard, it will look large in a room of 12 by 12 feet, and the nightstands must sit outside it. The Kartivo storage headboard bed is 80.5 inches wide, which with two 20 inch nightstands takes 120.5 inches, more than a 10 foot wall. In a 12 foot wall it leaves 23.5 inches.
A cal king is long as well: 84 inches for the mattress and 90.5 to 90.6 for the beds, which in a 144 inch room leaves 53.4 inches at the foot. That is enough for a walkway and a small bench of 16 inches depth, with 37 inches left.
The Nectar bamboo bed is the one with the least information in the text we read, and also the one with the plainest description of assembly. If you want a bed you can plan for, choose the listing with numbers, and ask the others for theirs.
Before you order, screenshot the listing page, including the size table, so you have a record of what the seller stated. If the bed arrives at a width that differs from the table by more than an inch or two, that record supports a return. It also helps to ask whether the headboard is included in the stated width, since that single answer changes the room plan.
Remember that a cal king mattress has its own sheets, protectors and headboard widths. A king sheet set will not fit, and a king headboard of 76 inches is 4 inches wider than the 72 inch mattress, which looks wide on a cal king bed. Match each accessory to the 72 by 84 inch size.
Frequently asked questions
How big is a California king mattress?
72 by 84 inches per Amerisleep.
How wide is a cal king upholstered bed?
The two Kartivo listings give 92.5 and 80.5 inches, probably including the headboard.
How much weight can the Nectar cal king hold?
500 pounds per its table, against 800 pounds for the queen version.
Does a cal king need a box spring?
The Nectar listing says no box spring is needed; the Kartivo listings do not say in the text we read.
How much room does a cal king bed need?
Amerisleep suggests about 12 by 12 feet.
Is a cal king the same as a king?
No. It is 4 inches narrower and 4 inches longer.
Products worth checking
We have not tested these products. Sizes and features come from the Amazon listings as we read them; where a listing does not say, we say so.
Nectar Bamboo Platform Bed Frame & Upholstered Headboard – California King – Walnut/Linen
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
Kartivo California King Bed Frame with Headboard, Upholstered Platform Bed, LED Lights, Charging Station, Gray
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
Kartivo California King Bed Frame with Storage Headboard, Upholstered Platform Bed, Beige
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
Sources checked
Specifications come from the Amazon listings as we read them for this guide. Product details and availability can change, so confirm on the product page before you buy.
