---
title: "21st Birthday Plates — $70K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/21st-birthday-plates"
last_updated: "2026-08-09T20:25:52.030Z"
locale: en
meta:
description: "Niche score 54/100 · $70K/yr market · 79K searches/yr · $12.10 avg price. A small market ($70K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · $70K/yr market · 79K searches/yr · $12.10 avg price. A small market ($70K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "21st Birthday Plates — $70K/yr Amazon US Niche (2026) - Flapen"
---
# **21st birthday plates**
**Worth a look**
Shows a fragmented shelf (top 5 take 19% of clicks), but a small market ($70K/yr) keeps it on the watch list.
Market size 17Growth 29Conversion 76Competition 95Returns 45Price range 49Avg price 51Brand share 93Review moat 92Quality gap 21
**Competition**
**Incredible****19%**
top-5 click share — an open shelf
**Brand share**
**Great****42%**
top-5 brand share — no brand owns this niche
**Review moat**
**Great****169.09**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Great****7.3%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Good****$12.10**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$4.73–$24.99**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Okay****3.4%**
return rate — above 5% kills the launch gate
**Growth**
**Okay****+3.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$70K**
$70K/yr · 79K searches
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, 21st birthday plates is a $70K/yr Amazon United States market (79K searches/yr). The top 5 brands hold 42% of demand. Verdict: Worth a look — 54/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **21st birthday plates market data**
- **Units sold / yr**
- **5K–6K**
- avg 0–100/product
- **Revenue / yr**
- **$61K–$73K**
- units × avg price
- **Conversion rate**
- **7.3%**
- **Avg BSR**
- **#1,586**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **83%**
- **Out of stock**
- **9.9%**
- **Avg brand age**
- **25 months**
- **Avg seller age**
- **184 days**
## **Competition & brand share**
Clicks spread well past the top 5 (19% combined) — an open shelf where new products get seen.
**Brands**
**54 **▼falling
**Sellers**
**56**
**Top-5 brand share**
**42%**
Top 20: 79%
**Top-5 click share**
**19%**
Top 20: 53%
**Open market**
**54%**
- KHAIVI11% - IETOSY10% - LDFDRT8% - Juhap7% - KFJBPB6% - Greencian4%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +3.2% search growth over the last 90 days.
2K1KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/health-household/21st-birthday-plates/trend)
## **Top 21st birthday plates search terms**
- **21st birthday plates**29K/yr+6.9%4.4% conv. - **21st birthday plates and napkins**29K/yr-4.7%5.5% conv. - **21st birthday napkins**16K/yr+13.6%4.1% conv. - **21st birthday cake plates**5K/yr-0.8%4.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/21st-birthday-plates/search-terms)
## **Top 21st birthday plates 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%2%$1K4%$3K6%$4K8%$6K1101001K10K 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**60 PCS 21st Birthday Decorations for Women 21st Birthday Plates and Napkins Rose Gold Disposable Tableware Set Party Supplies for Women Girl Cheers to 21 Years Anniversary (21ST)**KFJBPB**$8.88**4.7★82 rev](https://www.amazon.com/dp/B0FV1J2T4Q) [2**40 Pcs 21st Birthday Decorations for Him Men Happy 21 Bday Decor Black and Gold 21 Years Tableware Table Decor 21st Birthday Plates Napkins for Her Women Party Supplies**KHAIVI**$9.77**4.5★595 rev](https://www.amazon.com/dp/B0CX4KHR7K) [3**IETOSY White and Gold 21st Birthday Party Tableware Decorations Plates and Napkins Disposable Paper 21st Plates Napkins for Her Him 21 Years Birthday Party Supplies Serves 20**IETOSY**$10.83**4.6★18 rev](https://www.amazon.com/dp/B0FXLYGBMN) [4**Pandecor Birthday Party Plates and Napkins Party Supplies Disposable Birthday Party Decorations Set Serve up to 20 Guests (21st)**Pandecor**$11.82**4.5★86 rev](https://www.amazon.com/dp/B0BVTD8S7G) [5**IETOSY 21st Birthday Party Plates and Napkins 21 Years Decorations Black Silver Disposable Tableware Plates and Napkins Set for Her Him 21st Birthday Serves 20**IETOSY**$11.01**4.6★18 rev](https://www.amazon.com/dp/B0DT9VZTDF)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**96PCS 21st Champagne Bottle Birthday Decorations Happy 21st Pink Champagne Tableware Set Cheers to 21 Years Paper Plates Napkins for Girls Martini Theme Twenty-One Party Supplies Serve 24 Guests**Yiaoyinnz**$16.85**221 rev2mo ago](https://www.amazon.com/dp/B0GZ3XQZ5W) [**Bonjour Fte Cheers To 21 Icon Paper Party Cocktail Napkins | Premium Party Supplies| Gold Foil | Birthday Parties Milestone Celebrations Anniversaries Cocktail Tables | Pack of 20 5 Folded**Bonjour Fete**$8.70**1 rev5mo ago](https://www.amazon.com/dp/B0GMKN31BX) [**Cekivina 20Pcs 9Inch 21st Birthday Plates Legal 21st Birthday Blue & Silver Theme Party Tableware Party Plate Set Disposable Dinner Plates for 21st Birthday Decorations for Him or Her**Cekivina**$6.69**37 rev7mo ago](https://www.amazon.com/dp/B0G8WVDHFM) [**120PCS 21th Birthday Decorations for Boys 21 Years Old Birthday Decorations Sweet 21 Plates Napkins Tablecloth for Boys Girls 21th Birthday Party Supplies**XUELIREN**$12.59**181 rev7mo ago](https://www.amazon.com/dp/B0G56RLHK6) [**IETOSY White and Gold 21st Birthday Party Tableware Decorations Plates and Napkins Disposable Paper 21st Plates Napkins for Her Him 21 Years Birthday Party Supplies Serves 20**IETOSY**$10.83**18 rev9mo ago](https://www.amazon.com/dp/B0FXLYGBMN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**96PCS 21st Champagne Bottle Birthday Decorations Happy 21st Pink Champagne Tableware Set Cheers to 21 Years Paper Plates Napkins for Girls Martini Theme Twenty-One Party Supplies Serve 24 Guests**Yiaoyinnz**$16.85**4.6★**▲ 266%**](https://www.amazon.com/dp/B0GZ3XQZ5W) [**Bonjour Fte Cheers To 21 Icon Paper Party Cocktail Napkins | Premium Party Supplies| Gold Foil | Birthday Parties Milestone Celebrations Anniversaries Cocktail Tables | Pack of 20 5 Folded**Bonjour Fete**$8.70**5.0★**▲ 213%**](https://www.amazon.com/dp/B0GMKN31BX) [**Cekivina 20Pcs 9Inch 21st Birthday Plates Legal 21st Birthday Blue & Silver Theme Party Tableware Party Plate Set Disposable Dinner Plates for 21st Birthday Decorations for Him or Her**Cekivina**$6.69**4.6★**▲ 186%**](https://www.amazon.com/dp/B0G8WVDHFM) [**120PCS 21th Birthday Decorations for Boys 21 Years Old Birthday Decorations Sweet 21 Plates Napkins Tablecloth for Boys Girls 21th Birthday Party Supplies**XUELIREN**$12.59**4.8★**▲ 148%**](https://www.amazon.com/dp/B0G56RLHK6) [**60 Pcs 21st Birthday Decorations Black gold Paper Plates and Napkins Forks Party Tableware for Men Women Birthday Party Decorations Serve 20**LDFDRT**$8.20**4.6★**▲ 108%**](https://www.amazon.com/dp/B0FKGZVJXB)
**~~View all trending →~~**
## **What buyers say about 21st birthday plates**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**31%
*“Cheap and really cute”*
**Advertised Vs Actual Product**19%
*“Exactly what i wanted”*
**Value For Money**10%
*“Great deal”*
**Brightness/Shine/Glow**6%
*“Perfect candles”*
**Strength**6%
*“Sturdy and vibrant, great value and fast shipping”*
**Color**4%
*“Love the colors”*
**Design-Overall**3%
*“which added a touch of elegance to the table setting”*
**Thickness**3%
*“The napkins were also thick”*
**Material Quality**2%
*“Material was great”*
**Durability**2%
*“They are durable”*
### **What buyers complain about **
**Size-Overall**35%
*“did not fit well”*
**Strength**16%
*“They break too easily”*
**Advertised Vs Actual Product**11%
*“Misleading photos”*
**Quality-Overall**7%
*“Cheap”*
**Smell**7%
*“stinks”*
**Value For Money**2%
*“Overpriced for the size”*
**Adhesion/Stickiness**2%
*“also the sticky did not stick”*
**Thickness**2%
*“are very, very thin, plates are good”*
**Color**2%
*“colors do not match”*
### **Top return reasons **
**Size-Overall**38%
**Color**20%
**Quality-Overall**9%
**Advertised Vs Actual Product**9%
**Value For Money**6%
**Design-Overall**2%
**Strength**2%
**Material Quality**2%
**Defective Material/Parts**1%
**Print Quality**1%
## **Common questions**
- **Is 21st birthday plates profitable to sell on Amazon United States?**
- The niche generates $70K/yr across 87 tracked products. 0 of 26 products launched in the last 360 days are still selling. 90-day search growth is +3.2%. Flapen's verdict: Worth a look (54/100).
- **How competitive is the 21st birthday plates niche?**
- 54 brands and 56 sellers compete. The top 5 products take 19% of clicks and top 5 brands hold 42% of demand.
- **What do buyers complain about in 21st birthday plates?**
- Top complaints mined from reviews: Size-Overall, Strength, Advertised Vs Actual Product. The return rate is 3.4%.
- **When does demand for 21st birthday plates peak?**
- Demand is steady year-round — the busiest month runs 1.9× the quietest.
- **What does it cost to enter the 21st birthday plates niche?**
- Listings span $4.73–$24.99; the average listing price is $12.10 (sweet spot $15–$100). The average incumbent carries 169 reviews — the moat a new listing must climb.
## **Related niches in Health & Household**
- 76 [**cedar oil**](https://flapen.com/research/us/health-household/cedar-oil)$1.2M/yr+214.4%**Launch it**- 77 [**nutrapure glp1 cutting mix**](https://flapen.com/research/us/health-household/nutrapure-glp1-cutting-mix)$149K/yr+940.2%**Worth a look**- 77 [**dexcom g7**](https://flapen.com/research/us/health-household/dexcom-g7)$2.0M/yr+39.9%**Launch it**- 77 [**purelia**](https://flapen.com/research/us/health-household/purelia)$635K/yr+359.7%**Worth a look**- 77 [**graduation napkins**](https://flapen.com/research/us/health-household/graduation-napkins)$302K/yr+385.7%**Worth a look**- 77 [**credit card wand**](https://flapen.com/research/us/health-household/credit-card-wand)$418K/yr+101.3%**Worth a look**[**All Health & Household niches **](https://flapen.com/research/us/health-household)