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157K Courses, 425M Enrollments: Breaking Down Udemy’s Massive Catalog

From course ratings to pricing, let’s have a look at some of the discernible trends of Udemy’s catalog.

Udemy — Growth of Courses
Udemy — Growth of Courses

On Udemy, anyone can offer a course. Since the platform launched in 2010, this approach has turned Udemy into the world’s largest catalog of online courses: they host over 157,000 courses.

According to the company, they have 35 million registered users. In 2020, propelled by the pandemic, they raised $123 million and increased their valuation by over $1 billion. Overall, the company has raised ~$300 million at an over $3 billion valuation.

Last week, Class Central published a list of Udemy’s 250 most popular online courses, noting that they had over 157,000 courses, 425 million enrollments, and 32 million ratings. Surprisingly, despite its magnitude, Udemy’s catalog seems to have seldom been analyzed.

So in this article, we’re going to break down Udemy’s numbers a little further. My colleague @Suparn collected data about the provider’s catalog. And with my newly acquired Excel skills (albeit rudimentary), I dug into the data. Here’s what I found.

Udemy By the Numbers

Course Categories

Udemy — Courses by Category
Udemy — Courses by Category

Half of Udemy’s courses belong to the fields of Business and Technology, but they account for 70% of all enrollments.

Udemy — Enrollments per Category
Udemy — Enrollments per Category

Technology courses are the most popular. They have on average 4,200 learners per course, well above the 2,700 average across the platform.

Course Length

Udemy — Course Length vs. Enrollments
Udemy — Course Length vs. Enrollments

The average course length is 4.5 hours, while the median is 2 hours. As course lengths increase, average enrollments also increase: learners gravitate towards longer courses.

Courses that are less than 1 hour long have an average enrollment of 2,100, while courses 15–20 hours long have an average enrollment of 7,300. There are 4,000 courses longer than 20 hours — their average enrollment is 11,400.

Course Price

Udemy — Course Pricing Breakdown
Udemy — Course Pricing Breakdown

90% of Udemy courses are paid. Course prices range from $19.99 to $199.99 (without any discounts or deals).

As you can see below, average enrollments increase as the courses’ list prices increase. This doesn’t seem to conform to the traditional supply-demand pattern: higher prices resulting in lower enrollments. This is because Udemy courses are rarely sold at list price.

Udemy runs a lot of promotions bringing the cost of the courses down. Popular courses probably have increased their list price. I’ve noticed over the last couple of years that the frequency of these promotions has gone down.

Udemy — Average Enrollments per Course vs. List Price
Udemy — Average Enrollments per Course vs. List Price

40% of Udemy’s courses cost less than $30, while 24% cost more than $100.

Course Language

Udemy courses are available in 70 different languages. 63% of all courses are offered in English. Here are the five most common languages on the platform:

  • English — 63%.
  • Portuguese — 9%.
  • Spanish — 8%.
  • Turkish — 3.3%.
  • French & Japanese — 2.4%.

Course Enrollments

Udemy — Enrollments by Course Category
Udemy — Enrollments by Course Category

Combined, Udemy’s 157K courses have gathered ~425 million enrollments and average 2,700 enrollments per course. What I found most surprising is that the median enrollment is only 188, which means that half of Udemy’s courses don’t reach 200 learners.

Currently, there are 335 courses with over 100K enrollments and a couple with over a million enrollments.

Do Udemy courses satisfy the Pareto 80/20 principle? I found that Udemy’s top-20% courses by enrollment account for 90% of all enrollments.

Course Ratings

Udemy — Average Rating vs. Course Length
Udemy — Average Rating vs. Course Length

In total, Udemy courses have received 32 million ratings. Class Central’s analysis found that 21K of Udemy’s 157K courses have no rating at all.

Ratings tend to be heavily skewed towards the positive side. 85% of the ratings are 4–5 stars. 1–2 star represent only ~4% of all the ratings.

We also noticed that the rating is correlated with the length of the course. Longer courses might just be higher effort, more polished, or appear to offer more bang for your buck when offered at a discount.

[1] We combined Development and IT & Software.
[2] We combined Business, Marketing, Office Productivity, and Finance & Accounting.
[3] We combined Design, Music, Photography & Video into Art & Design.


Dhawal Shah Profile Image

Dhawal Shah

Dhawal is the CEO of Class Central, the most popular search engine and review site for online courses and MOOCs. He has completed over a dozen MOOCs and has written over 200 articles about the MOOC space, including contributions to TechCrunch, EdSurge, Quartz, and VentureBeat.

Comments 5

  1. Mona

    Hey Dhawal

    Hope you’re well – happy new year!

    This is a great piece of analysis. We’re wondering if you know whether the Udemy for Business enrolments get counted in their total course enrolments?



    • Dhawal Shah

      Hey Mona! Unfortunately it is not clear whether Udemy for Business enrollments are included or not.

      Even if they are included, I am not sure they would make an impact to these numbers. Based on $100 million/year in revenue and $360/year plan, enrollments might be in single digit millions in the best case scenario.

  2. Vincent Goln

    Could you please explain the source of your data? How did you get hold of the entire Udemy catalogue?

    • Dhawal Shah

      We collected the data via their API.

      • Greg

        Very nicely done — that’s exactly the right way to do it.


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