Birthday-themed POD t-shirts: How big are they on Amazon Merch on Demand?

Birthdays call for celebrations. And there’s no better way to show that you’re part of someone’s birthday squad than with a witty, carefully designed t-shirt.

For shoppers on the lookout for such items, Amazon Merch on Demand is the perfect place.

But does this mean that sellers in this niche are making inroads? What is the size and scope of the market and is it worth pursuing?

This article offers the answers to these questions.

Keep reading to find out more.

How big are birthday-themed t-shirts on Amazon Merch on Demand?

To determine the market size of birthday-themed t-shirts on Amazon Merch on Demand, we headed over to Merch Informer’s Products Search module.

We typed in the seed keyword “birthday”, selected the US marketplace, and chose t-shirts as the merch category.

The tool instantly displayed insights that gave us a deeper understanding of the segment.

In particular, we looked at popular niche-related keywords, listing saturation, and of course, pricing.

Let’s take a closer look at each of these metrics.

Keywords, search volume and BSR

Keywords in listing titles and descriptions are essential for rankings. In that sense, it’s key to uncover the phrases that consumers are actively searching for.

This will help you optimize your listings and make your birthday t-shirts appear higher in search results. Consequently, you’ll enjoy more traffic and sales.

We sifted through the top 50 keywords to determine which words have the highest relevance and search volumes.

Here’s what we found:

  • “Birthday birthday”: search volume – 296,029
  • “Birthday for”: search volume – 275,432
  • “Birthdays”: search volume – 248,324
  • “Birthday”: search volume – 228,109
  • “Grandpa birthday”: search volume – 5,797
  • “Grandmom birthday”: search volume – 3,870
  • “Great birthday”: search volume – 3,408
  • “Grandpa’s birthday”: search volume – 1,874

Instantly, it becomes clear that there is an exceptionally high search volume for the seed word and its variant (more than 200,000 searches per month).

It’s also important to note that the average Best Sellers Rank (BSR) of t-shirt listings ranking for “birthday” is 4,277,768. This indicates that such products are not only browsed for but also purchased.

Another important conclusion from the data above is that search volumes are typically higher for long-tail keywords. These are words like “grandpa birthday”, which demonstrate a specific intent.

The search volumes we explored also suggest the most popular audience in the birthday t-shirt space. It appears that the majority of shoppers search for these items as gifts for their grandparents.

Let’s see how these discoveries compare against existing listings. Are sellers frequently utilizing such keywords in titles and descriptions?

Keyword saturation

In short, keyword saturation refers to the combination of keywords used to ensure greater listing visibility and high rankings.

Below, you’ll see some of the most repeatedly used phrases among birthday t-shirt listings:

  • Seed keywords: birthday (7,289), happy (149)
  • Related keywords: party (1,470), year (580), matching (559)
  • Audience: girl (659), boy (656), family (588), girls (338), women (319), boys (319), mom (296), dad (282), brother (256), sister (255), kids (252), men (195), squad (176), crew (161), daughter (131), son (103)
  • Adjectives: funny (381), cute (372), awesome (168), cool (145), beautiful (100)
  • Purpose: gifts (345), celebrate (221), present (99)
  • Nouns: unicorn (328), soccer(243), queen (201), flamingo (199), truck (194), princess (183), ninja (146), space (110)

Right off the bat, it becomes evident that the seed keyword is heavily featured in most of the listings. Other related keywords that are commonly used include “party”, “year”, and “matching”.

We can also clearly see that the audience is extremely broad. This is perhaps attributed to the universal nature of birthdays. People often seek unique presents for their loved ones on this special day. Naturally, birthday t-shirts are a popular choice.

This theory is confirmed by the appearance of keywords like “gift” and “present” in the list above.

It’s worth noting that many of these shirts also feature nouns that describe children’s themes. For example, some of the trending ones include “unicorn”, “truck”, “ninja”, and “space”.

Although there may be higher searches for birthday t-shirts for grandparents, sellers are actively targeting adults looking for a children’s birthday t-shirt.


But how are bestsellers pricing their listings in this niche? Are they earning royalties that are worth it?

We used Merch Informer to identify the lowest, highest, and average prices in the market.

Here are the results:

  • Lowest price: $11.99
  • Highest price: $24.97
  • Average price: $18.23

Let’s turn these numbers into royalties.

Say you enter the birthday t-shirt space and price your listings around the average. In that case, you can expect to earn between $1.93 and $3.41 for each sale you make.

A look into real-life bestsellers will help you determine whether this is an attractive opportunity based on sales volumes.

Let’s dive in deeper.

What are some of the bestselling merchants doing right?

The best way to establish the potential of a niche is to look at how the chart toppers are performing.

We analyzed two of the top performing sellers in the birthday t-shirt domain in detail.

Below are our results.

Seller 1

  • Title: Dolphin Birthday Birthday Girl T-Shirt
  • Seller: Dolphin Youth Girl HD0
  • Price: $19.99
  • BSR: 106,427
  • Sales: 24

Seller 2

  • Title: Birthday Halloween Shirt – Halloween Birthday Gifts T-Shirt
  • Seller: Halloween Birthday Shirt
  • Price: $19.98
  • BSR: 28,652
  • Sales: 90


The first thing that stands out is that both listing titles feature the words “birthday” and “t-shirt”.

Seller one has precisely described their audience using specific keywords like “dolphin birthday” and “girl.” On the other hand, the second seller has labelled their product as a “gift” with a Halloween theme.

Both sellers have relatively short titles, which fall within the character limit set by Amazon Merch on Demand. This means that they have the opportunity to further expand on these titles for optimization purposes.


As noted earlier, the average price for this niche is $18.23.

Seller one has priced their birthday t-shirt at $19.99 (slightly higher than the average), while seller two has priced their design at $19.98 (above the market average).

The two bestsellers are therefore employing a pricing strategy according to industry best practices.

Regardless of the niche, it’s always recommended to position your products around the average price in the market. As a result, you can gain a competitive edge and stand out from the crowd.


Both t-shirt designs are unique in their own way and they speak volumes about each seller’s intended audience.

For example, the dolphin t-shirt is suitable for young girls from the age of 8 to 13.

On the contrary, the Halloween t-shirt is designed for older audiences or anyone whose birthday falls on Halloween. In addition, it becomes apparent that this product is targeted at older audiences, or at least consumers who can read.

That’s because it features a text-heavy design, making it incomprehensible for younger children.

What is the profitability in this niche?

Now, let’s get back to the topic of profitability.

To calculate the level of profitability in this niche, we looked at each seller’s total number of sales. We then used an Amazon royalty chart to determine each listing’s earnings based on price.

Here are our findings:

Seller 1

  • Price: $19.99
  • Sales: 24
  • Royalties: $4.89
  • Profit: $117.36

Seller 2

  • Price: $19.98
  • Sales: 90
  • Royalties: $4.89
  • Profit: $440.10

Although these numbers may not be thrilling, remember that they only represent a single listing.

Sellers with a diverse portfolio in the birthday t-shirt space who optimize adequately and price right can, without a doubt, bring home substantial side money.

Our recommendations

If you’ve set your eyes on birthday t-shirts as an opportunity-rich space, you’ll need some tips and tricks to become successful.

Based on our research, we’ve extracted key best practices that we share with you below.


To optimize your listing, start by selecting the seed keyword “birthday” or its variations. Then, enhance your title with information about the theme of your design and your target audience.

For example, seller one’s title mentions that their “dolphin” shirt is for “girls”. This makes it clear who the product is for, boosting relevancy for such searches.


Accurate pricing is essential for two reasons.

One, it will not alienate a large portion of your audience. And two, it will not lead to your product being perceived as cheap (which often screams “low quality” in the mind of the consumer).

We highly recommend pricing around the average.


When it comes to birthday t-shirt designs, the sky is the limit.

This is because every single person worldwide celebrates a birthday, offering a vast audience for your creations.

Some of the most popular designs are targeted at younger children, so bear that in mind when you bring your t-shirts to life.

Final thoughts

Overall, entering the birthday-themed t-shirt niche on Amazon Merch on Demand has a high potential for profitability.

However, it’s a matter of approaching your sales efforts in a strategic and targeted way.

You can really take your passive income game to another level by using the market insights and recommendations above. By combining our discoveries with additional data from Merch Informer, you’ll be well-equipped for a successful venture.

For only $9.99, it’s a remarkably low investment into something that has the potential to earn you fruitful financial earnings.

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