california king box spring
Skip itHigh returns (6.9%) — this niche doesn't clear our bar today.
Avg price
Good$115.24avg listing price — sweet spot $15–$100
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Good66%top-5 brand share — brands hold most of the demand
Market size
Good$496K$496K/yr · 142K searches
Competition
Good50%top-5 click share — leaders hold, buyers still browse
Review moat
Okay2,410.68avg incumbent reviews — the moat a new listing must climb
Conversion
Okay3.0%search→purchase rate — share of searches ending in a sale
Price range
Okay$73.59–$142.88cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-0.5%90-day search growth — must beat 0% to launch
Returns
Bad6.9%return rate — above 5% kills the launch gate
According to Flapen's Amazon United States niche tracking, california king box spring is a $496K/yr Amazon United States market (142K searches/yr). The top 5 brands hold 66% of demand. Verdict: Skip it — 47/100.
Data updated Jul 30, 2026 · scored weekly · How we score niches
california king box spring market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $346K–$461K
- units × avg price
- Conversion rate
- 3.0%
- Avg BSR
- #431
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 92%
- Out of stock
- 0.0%
- Avg brand age
- 32 months
- Avg seller age
- 192 days
Competition & brand share
The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.Brands
17 rising
Sellers
20
Top-5 brand share
66%
Top 20: 100%
Top-5 click share
50%
Top 20: 94%
Open market
28%
- Amazon Basics23%
- MAF15%
- Snaye14%
- DORITRON8%
- Zinus7%
- RLDVAY6%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -0.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.2×
Top california king box spring search terms
- california king box spring61K/yr
- cal king box spring27K/yr
- california king box spring only21K/yr
- box spring california king12K/yr
- cali king box spring9K/yr
- cal king box spring only9K/yr
- box spring for california king bed5K/yr
Top california king box spring products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Amazon Basics Smart Box Spring Bed Base 9-Inch Height Mattress Foundation Tool-Free Easy Assembly Metal Frame Cal King 83 x 71 x 9 White
Amazon Basics$142.884.5★38,479 rev
MAF Cal King Size King Box Spring 10 Inch High Profile Box Spring Cal King 3500 lbs Black Heavy Duty Metal Mattress Foundation with Easy Clean Fabric Cover Easy Assembly
MAF$141.414.6★833 rev
Snaye Box Spring California King Bed Base 5 Inch 3000lbs Heavy Duty Cali King Box Spring Metal Mattress Foundation Tool-Free Easy Assembly Noise Free
Snaye$100.344.3★889 rev
Zinus 9 Inch Metal Smart Box Spring with Quick Assembly California King
Zinus$123.504.4★4,069 rev
RLDVAY California-King Box-Spring 9 inch Metal Cal King Box Spring Only Heavy Duty Cali King Box Spring with Fabric Cover Easy Assembly Non Slip Noise Free
RLDVAY$132.424.2★1,344 rev
Newest
by launch date
Tyndall Box Spring King Bed Base 7 Inch High Metal King Size Box Spring Only Heavy Duty Mattress Foundation with Fabric Cover Easy Assembly Quiet Noise Free Black
Tyndall$73.59104 rev
Beautyrest Standard Cal King Mattress Foundation
Beautyrest$122.0711 rev
DORITRON California King Box Spring 9 Inch 3000lbs Heavy Duty Cal King Box Spring Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$105.57166 rev
DORITRON Cal King Box Spring 7 Inch 3000lbs Heavy Duty Box Spring California King Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$103.31166 rev
DORITRON 5 Inch California King Box Spring Only 3000lbs Heavy Duty Cali King Box Spring Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$98.25166 rev
Trending
90-day click momentumBeautyrest Standard Cal King Mattress Foundation
Beautyrest$122.074.2★
DORITRON California King Box Spring 9 Inch 3000lbs Heavy Duty Cal King Box Spring Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$105.574.4★
DORITRON 5 Inch California King Box Spring Only 3000lbs Heavy Duty Cali King Box Spring Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$98.254.4★
DORITRON Cal King Box Spring 7 Inch 3000lbs Heavy Duty Box Spring California King Bed Base Metal Mattress Foundation Easy Assembly Noise Free
DORITRON$103.314.4★
Tyndall Box Spring King Bed Base 7 Inch High Metal King Size Box Spring Only Heavy Duty Mattress Foundation with Fabric Cover Easy Assembly Quiet Noise Free Black
Tyndall$73.594.4★
What buyers say about california king box spring
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to put together”
“Sturdy, easy assembly & exactly as described”
“Nice size”
“Great quality, easy to assemble”
“Exactly as advertised”
“Rest assured the instructions are simple”
“So easy”
“Its worth the time”
“Durable”
“baby you will get rest and comfort”
What buyers complain about
“I spent 45 minutes trying to convince two parts to align”
“It doesnt feel sturdy”
“First off, the box arrived weighing approximately the same as a mid-size sedan”
“It def was not cal king size”
“not this is not because it isnt perfectly aligned on all sides”
“Seems the products are getting worse”
“Bent materials”
“then gave up halfway through”
Top return reasons
Common questions
- Is california king box spring profitable to sell on Amazon United States?
- The niche generates $496K/yr across 25 tracked products. 4 of 11 products launched in the last 360 days are still selling. 90-day search growth is -0.5%. Flapen's verdict: Skip it (47/100).
- How competitive is the california king box spring niche?
- 17 brands and 20 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 66% of demand.
- What do buyers complain about in california king box spring?
- Top complaints mined from reviews: Assembly/Installation, Strength, Weight Heavy. The return rate is 6.9% — above our launch gate.
- When does demand for california king box spring peak?
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- What does it cost to enter the california king box spring niche?
- Listings span $73.59–$142.88; the average listing price is $115.24 (sweet spot $15–$100). The average incumbent carries 2,411 reviews — the moat a new listing must climb.