---
title: "Mattress Foundation King — $119K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/mattress-foundation-king"
last_updated: "2026-08-11T02:34:42.694Z"
locale: en
meta:
description: "Niche score 41/100 · $119K/yr market · 62K searches/yr · $119.50 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $119K/yr market · 62K searches/yr · $119.50 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Mattress Foundation King — $119K/yr Amazon US Niche (2026) - Flapen"
---
# **mattress foundation king**
**Skip it**
Weak search conversion (1.6%) — this niche doesn't clear our bar today.
Market size 28Growth 40Conversion 20Competition 62Returns 36Price range 22Avg price 69Brand share 53Review moat 22Quality gap 57
**Avg price**
**Good****$119.50**
avg listing price — sweet spot $15–$100
**Competition**
**Good****48%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+11.9%**
90-day search growth — must beat 0% to launch
**Returns**
**Okay****4.1%**
return rate — above 5% kills the launch gate
**Market size**
**Okay****$119K**
$119K/yr · 62K searches
**Review moat**
**Bad****8,959.09**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Bad****$60.19–$241.85**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Bad****1.6%**
search→purchase rate — share of searches ending in a sale
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, mattress foundation king is a $119K/yr Amazon United States market (62K searches/yr). The top 5 brands hold 73% of demand. Verdict: Skip it — 41/100.
Data updated Jul 30, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mattress foundation king market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **$120K–$149K**
- units × avg price
- **Conversion rate**
- **1.6%**
- **Avg BSR**
- **#29**
- **Page quality**
- **0%**
- **Prime**
- **91%**
- **Sponsored**
- **81%**
- **Out of stock**
- **2.1%**
- **Avg brand age**
- **26 months**
- **Avg seller age**
- **199 days**
## **Competition & brand share**
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**17**
**Top-5 brand share**
**73%**
Top 20: 100%
**Top-5 click share**
**48%**
Top 20: 87%
**Open market**
**21%**
- Amazon Basics32% - ALDRICH14% - Meliusly13% - TROZULER8% - MAF7% - Zinus6%
## **Demand**
Weekly Amazon search volume, last 22 weeks — +11.9% search growth over the last 90 days.
1K750Spike '26Mar '26Mar '26Apr '26May '26May '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/home-kitchen/mattress-foundation-king/trend)
## **Top mattress foundation king search terms**
- **mattress foundation king**14K/yr+37.0%1.0% conv. - **king size foundation**12K/yr+13.7%1.0% conv. - **king mattress foundation**12K/yr+5.5%1.6% conv. - **king foundation**11K/yr+4.3%1.5% conv. - **king size mattress foundation**5K/yr+44.5%1.0% conv. - **king bed foundation base**4K/yr+8.7%2.0% conv. - **mattress foundation for king size bed**4K/yr-66.8%0.9% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/mattress-foundation-king/search-terms)
## **Top mattress foundation king 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.
0%4%$5K8%$9K12%$14K16%$19K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Amazon Basics Smart Box Spring Bed Base 7-Inch Height Mattress Foundation Tool-Free Easy Assembly King Size Bed Sturdy Support Durable Construction 79 x 75.5 x 7 White**Amazon Basics**$130.20**4.5★38,479 rev](https://www.amazon.com/dp/B082T8HXS5) [2**Meliusly Heavy Duty Bunkie Board King Size (76x80) Bed Support Board**Meliusly**$130.92**4.6★2,058 rev](https://www.amazon.com/dp/B0DKQR32T6) [3**Amazon Basics Smart Box Spring Bed Base 9-Inch Height Sturdy Mattress Foundation Strong Metal Support Tool-Free Easy Assembly King 79L x 75.5W x 9H White**Amazon Basics**$136.96**4.5★38,479 rev](https://www.amazon.com/dp/B07K6MP2SL) [4**Amazon Basics Smart Box Spring Bed Base 5-Inch Height Mattress Foundation Tool-Free Easy Assembly King 79 x 75.5 x 5 White**Amazon Basics**$125.88**4.5★38,479 rev](https://www.amazon.com/dp/B07K6F34M7) [5**ALDRICH 7 Inch Heavy Duty Metal Box Spring Mattress Foundation 3000lbs Max Weight Capacity/Non-Slip/No Noise/Easy Assembly/Easy Clean Cover King**ALDRICH**$93.13**4.2★3,663 rev](https://www.amazon.com/dp/B0CCJFDRGD)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Beautyrest Standard King Mattress Foundation**Beautyrest**$187.06**11 rev7mo ago](https://www.amazon.com/dp/B0G996QT11) [**Beautyrest Standard Cal King Mattress Foundation**Beautyrest**$122.07**11 rev7mo ago](https://www.amazon.com/dp/B0G9BFJV2Q) [**Golden Home Essentials Heavy Duty Bunkie Board King 10mm (76 x 80) Non-Slip Grip Low-Profile Mattress Support for Slats or Box Spring Quiet Moisture-Resistant Bed Board**Golden Home Essentials**$109.82**287 rev9mo ago](https://www.amazon.com/dp/B0FY7429JL) [**TROZULER 7 Inch King Size Box Spring Heavy Duty Metal Mattress Foundation 3000 lbs Capacity High Profile Noise-Free Easy Assembly with Fabric Cover**TROZULER**$61.80**2,132 rev9mo ago](https://www.amazon.com/dp/B0FVMKJYVB) [**TROZULER 5 Inch King Size Box Spring Heavy Duty Metal Mattress Foundation 3000 lbs Capacity Low Profile Noise-Free Easy Assembly with Fabric Cover**TROZULER**$61.33**2,132 rev9mo ago](https://www.amazon.com/dp/B0FVM8J9KB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Beautyrest Standard Cal King Mattress Foundation**Beautyrest**$122.07**4.2★**▲ 276%**](https://www.amazon.com/dp/B0G9BFJV2Q) [**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**$142.88**4.5★**▲ 200%**](https://www.amazon.com/dp/B07K6JF1Y8) [**Beautyrest Standard King Mattress Foundation**Beautyrest**$187.06**4.2★**▲ 191%**](https://www.amazon.com/dp/B0G996QT11) [**TROZULER 9 Inch King Size Box Spring Heavy Duty Metal Mattress Foundation 3000 lbs Capacity High Profile Noise-Free Easy Assembly with Fabric Cover**TROZULER**$68.92**4.3★**▲ 164%**](https://www.amazon.com/dp/B0FVMJKLSW) [**ZINUS 9 Inch No Assembly Metal Box Spring Cool Mattress Foundation Sturdy Metal Structure Split King White**Zinus**$241.85**4.7★**▲ 143%**](https://www.amazon.com/dp/B00R6OX8YS)
**~~View all trending →~~**
## **What buyers say about mattress foundation king**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**28%
*“Easy assemble”*
**Strength**14%
*“The bed is sturdy”*
**Quality-Overall**11%
*“The quality is solid”*
**Value For Money**7%
*“Cant beat the price”*
**Size-Overall**6%
*“True to size”*
**Advertised Vs Actual Product**5%
*“Just as described”*
**Comfort-Overall**3%
*“Very comfortable”*
**Ease Of Use**2%
*“Easy Peasy”*
**Storage Capacity**2%
*“I could easily store things under my bed”*
**Height**2%
*“add comfortable height to the bed”*
### **What buyers complain about **
**Size-Overall**14%
*“To small”*
**Quality-Overall**11%
*“Very crappy quality”*
**Durability**11%
*“Broke”*
**Assembly/Installation**10%
*“VERY difficult to assemble”*
**Strength**7%
*“NOT STURDY”*
**Sags/Sinks**4%
*“Stops sagging”*
**Instructions/User Manual/Troubleshooting**3%
*“No instructions”*
**Value For Money**3%
*“Cheap price”*
**Height**2%
*“Too high”*
**Weight Heavy**2%
*“Product is extremely heavy”*
### **Top return reasons **
**Size-Overall**40%
**Height**21%
**Advertised Vs Actual Product**7%
**Assembly/Installation**7%
**Defective Material/Parts**6%
**Strength**2%
**Functionality-Overall**2%
**Quality-Overall**2%
**Value For Money**1%
**Weight Heavy**1%
## **Common questions**
- **Is mattress foundation king profitable to sell on Amazon United States?**
- The niche generates $119K/yr across 32 tracked products. 5 of 8 products launched in the last 360 days are still selling. 90-day search growth is +11.9%. Flapen's verdict: Skip it (41/100).
- **How competitive is the mattress foundation king niche?**
- 17 brands and 17 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 73% of demand.
- **What do buyers complain about in mattress foundation king?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Durability. The return rate is 4.1%.
- **What does it cost to enter the mattress foundation king niche?**
- Listings span $60.19–$241.85; the average listing price is $119.50 (sweet spot $15–$100). The average incumbent carries 8,959 reviews — the moat a new listing must climb.
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