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.

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.

Competition

Incredible19%

top-5 click share — an open shelf

Brand share

Great42%

top-5 brand share — no brand owns this niche

Review moat

Great169.09

avg incumbent reviews — the moat a new listing must climb

Conversion

Great7.3%

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

Okay3.4%

return rate — above 5% kills the launch gate

Growth

Okay+3.2%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$70K

$70K/yr · 79K searches

Signals No Dominant Brand

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

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

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.

No pronounced peak months · busiest ÷ quietest = 1.9×

Open Trend

Top 21st birthday plates search terms

21st birthday plates29K/yr +6.9%4.4% conv.
21st birthday plates and napkins29K/yr -4.7%5.5% conv.
21st birthday napkins16K/yr +13.6%4.1% conv.
21st birthday cake plates5K/yr -0.8%4.6% conv.

All 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.

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

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$8.884.7★82 rev

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$9.774.5★595 rev

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$10.834.6★18 rev

Pandecor Birthday Party Plates and Napkins Party Supplies Disposable Birthday Party Decorations Set Serve up to 20 Guests (21st)

Pandecor$11.824.5★86 rev

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$11.014.6★18 rev

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$16.85221 rev

2mo ago

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$8.701 rev

5mo ago

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$6.6937 rev

7mo ago

120PCS 21th Birthday Decorations for Boys 21 Years Old Birthday Decorations Sweet 21 Plates Napkins Tablecloth for Boys Girls 21th Birthday Party Supplies

XUELIREN$12.59181 rev

7mo ago

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$10.8318 rev

9mo ago

What buyers say about 21st birthday plates

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall31%

“Cheap and really cute”

Advertised Vs Actual Product19%

“Exactly what i wanted”

Value For Money10%

“Great deal”

Brightness/Shine/Glow6%

“Perfect candles”

Strength6%

“Sturdy and vibrant, great value and fast shipping”

Color4%

“Love the colors”

Design-Overall3%

“which added a touch of elegance to the table setting”

Thickness3%

“The napkins were also thick”

Material Quality2%

“Material was great”

Durability2%

“They are durable”

What buyers complain about

Size-Overall35%

“did not fit well”

Strength16%

“They break too easily”

Advertised Vs Actual Product11%

“Misleading photos”

Quality-Overall7%

“Cheap”

Smell7%

“stinks”

Value For Money2%

“Overpriced for the size”

Adhesion/Stickiness2%

“also the sticky did not stick”

Thickness2%

“are very, very thin, plates are good”

Color2%

“colors do not match”

Top return reasons

Size-Overall38%

Color20%

Quality-Overall9%

Advertised Vs Actual Product9%

Value For Money6%

Design-Overall2%

Strength2%