Product Management interview question [Guesstimate]: Estimate how many Zoom meetings take place over the course of the average week.

We will take a top-down approach for this question.

We assume that the main consumer segment of Zoom users are private sector companies employees. We assume that users don’t use Zoom for their personal calls (use WhatsApp video call instead) and no other segment is the target segment for Zoom.

There are approximately 3 billion people employed on planet earth. Considering 60% of these people are in government sector/construction site managers(or workers)/NGO workers/public sector/or any employees who don’t have to use calling in their jobs.

This leaves us with 40% of the workers who work in organizations that have meetings on a daily basis.

Out of these 40% employees, let’s assume around 30% of the employees are working from the office and don’t need a calling application because they have these meetings offline, so only 70% of these need a calling application.

Out of these 40% employees — around 30% are power users who use calling apps at an average of 6 times per day (Managers, Sales, and Support teams), around 60% users are normal users using calling apps 2 times a day (coders, developers, qa etc), and around 10% users don’t have the need to use calling apps in their jobs (back-office workers, traders etc). So total number of calls per day -

3 billion * 40% * 70% = 840 million

840 million * 0.3 * 6 ≈ 1.5 billion

840 million * 0.6 * 2 ≈ 1 billion

So total number of calls taking place each day ≈ 2.5 billion

Now, there are 4 applications that capture the majority of the market — Zoom, Google Meet, WebEx, and Microsoft Teams. Let’s assume these applications capture 92% of the market with 23% each, then the number of calls placed each day on Zoom -

2.5 billion * 0.23 = 575 million

Assuming 5 days work week, we get 575 million * 5 = 2.8 billion

So the number of Zoom calls (big and small) taking place per week is around 2.8 billion.