The internet has no single size, but you can measure it three ways

The internet is not a thing you can weigh or fit in a box. When people ask how large it is, they are usually asking one of three different questions: How many devices are connected? How much data moves through it each second? How much storage space does all the content take up? The answer to each one is different, and each one changes constantly.

There are roughly 5 billion people online right now, using somewhere between 15 and 20 billion connected devices — phones, computers, servers, smart home gadgets, industrial sensors. The amount of data crossing the internet every second is measured in exabytes, a unit so large that a single exabyte is roughly equivalent to 1,000 petabytes, or about 250 million DVDs. The total amount of stored data — every website, every email server, every video platform — is estimated in the zettabyte range, though nobody has an exact count because new storage is added constantly and old data is deleted constantly.

What matters for you is not the total number, but understanding what these measurements mean and why they matter to how the internet actually works.

Key Takeaways

  • The internet's size is measured three ways: number of connected devices, data flowing per second, and total stored data — each number is in the billions or higher.
  • The number of devices connected to the internet has grown from thousands in the 1990s to roughly 20 billion today, and keeps growing.
  • Data moves across the internet at speeds measured in exabytes per second, which is why a single video platform or social network can handle millions of simultaneous users.
  • The total amount of stored data on the internet is estimated in zettabytes, but this number is less useful than understanding that storage is distributed across millions of servers worldwide.
  • Internet size matters because it affects speed, reliability, and which services can exist — a service needs enough infrastructure to handle its users, or it fails.

How many devices are actually connected

In 1995, roughly 16 million people had internet access. Today, about 5 billion people are online, and they are using somewhere between 15 and 20 billion devices. That includes your phone, your laptop, your smart TV, your car's navigation system, your doorbell camera, the sensors in a factory, the servers that run Netflix, and thousands of other categories of things.

The growth has not been steady. For the first 15 years of the internet, the number of devices was small enough that you could theoretically count them. Then smartphones arrived, and the number exploded. Then came smart home devices, industrial sensors, and cloud servers. Each wave added billions of new connections.

Why does this number matter? Because every device connected to the internet needs an address — an IP address — so that data can find its way to it. The original system for assigning addresses (IPv4) was designed in the 1980s and can only create about 4 billion unique addresses. We ran out of new addresses around 2011. The solution was IPv6, a newer system that can create roughly 340 undecillion addresses — a number so large it is effectively infinite. But the transition from IPv4 to IPv6 is still ongoing, which is why some older systems still struggle with the growth.

How much data moves through the internet every second

Data crossing the internet is measured in bytes. A byte is 8 bits, the smallest unit of digital information. From there, the scale jumps quickly: a kilobyte is 1,000 bytes, a megabyte is 1,000 kilobytes, a gigabyte is 1,000 megabytes, a terabyte is 1,000 gigabytes, a petabyte is 1,000 terabytes, and an exabyte is 1,000 petabytes.

As of 2024, roughly 120 exabytes of data cross the internet every day. That is 120 million terabytes, or enough data to fill roughly 30 million DVDs, every single day. Most of that traffic is video — Netflix, YouTube, TikTok, and streaming services account for more than half of all internet traffic. The rest is email, web browsing, cloud storage, video calls, online gaming, and everything else.

This number matters because it tells you why the internet needs to be built the way it is. A single fiber optic cable can carry terabits of data per second — that is thousands of gigabits per second. But you need thousands of cables, thousands of routers, thousands of data centers, and thousands of companies managing pieces of the network, all working together. If the infrastructure were smaller, the internet would slow down or fail. If it were much larger, it would be wasteful.

How much data is stored on the internet

Stored data — all the websites, all the videos, all the emails, all the photos, all the databases — is measured in zettabytes. One zettabyte is 1,000 exabytes. Current estimates put the total amount of stored data somewhere between 60 and 100 zettabytes, though the number is hard to pin down because storage is constantly being added and deleted.

This number is less useful than it sounds, because it does not tell you where the data is or who owns it. Google stores roughly 15 exabytes of data. Amazon stores roughly 100 exabytes. Microsoft, Meta, Apple, and other large companies each store tens of exabytes. But so do millions of smaller companies, universities, governments, and individuals. The data is spread across millions of servers in data centers around the world.

What matters is not the total, but the distribution. If all the world's data were stored in one place, that place would be a single point of failure — if it went down, the internet would go down. Instead, data is replicated across multiple locations. Your email is stored on multiple servers. A popular website is mirrored across multiple data centers. This redundancy is why the internet keeps working even when parts of it fail.

Why internet size affects speed and reliability

The size of the internet directly affects how fast it is and how reliable it is. A larger internet with more infrastructure can handle more traffic without slowing down. A smaller internet with less infrastructure will slow down or fail when too many people try to use it at once.

This is why internet service providers (ISPs) invest in infrastructure. When they add more fiber optic cables, more routers, and more data centers, they are increasing the internet's capacity to handle traffic. When they do not invest enough, the internet in that area slows down during peak hours.

It is also why large companies like Netflix and Google build their own networks. They cannot rely on the public internet alone to deliver their services fast enough. Instead, they build private networks that connect their data centers to ISPs around the world, so that data reaches you faster. This is called a content delivery network, or CDN. The larger the CDN, the faster the service can be.

How the internet's size keeps growing

The internet is not finished growing. Every year, more devices connect, more data is created, and more storage is built. The growth is driven by several trends: more people coming online for the first time, more devices becoming "smart" and connecting to the internet, more video content being created and watched, and more data being generated by sensors and industrial equipment.

This growth creates challenges. The power consumption of data centers is rising. The environmental impact of manufacturing billions of new devices is significant. The infrastructure in some parts of the world is not keeping up with demand. But the growth also creates opportunities — new services become possible, new jobs are created, and people in remote areas can connect to the rest of the world.

Understanding the internet's size is not about memorizing numbers. It is about understanding that the internet is a physical thing made of cables, servers, and routers, and that its size determines what it can do. A larger internet can support more users, more data, and more services. A smaller internet cannot.

Frequently Asked Questions

Is the internet getting bigger or smaller?

The internet is getting bigger in every way — more devices connecting, more data flowing, more storage being built. The number of connected devices grows by roughly 15 percent each year. Data traffic doubles roughly every three years. Storage capacity increases constantly as new data centers are built.

How much of the internet is actually used?

Most of the internet's capacity is not used at any given moment. Networks are built with extra capacity so they can handle peak traffic without slowing down. During off-peak hours, much of the infrastructure is running below full capacity. This is why the internet is faster at 3 a.m. than at 8 p.m.

Can the internet run out of space?

Storage space can always be added by building more data centers, so the internet will not run out of space in that sense. However, the internet can run out of capacity if infrastructure does not keep up with demand. This happens in some regions where ISPs have not invested enough in new cables and routers.

Who owns the internet?

Nobody owns the entire internet. It is made up of millions of networks owned by different companies, governments, universities, and individuals. ISPs own the cables and routers that connect to your home. Tech companies own the data centers that store content. The internet works because all these separate networks are connected and follow common rules.

How do I know if my internet connection is fast enough?

Internet speed is measured in megabits per second (Mbps). Most people need 25 to 100 Mbps for everyday use like browsing and video calls. Video streaming needs 5 to 25 Mbps depending on quality. Online gaming needs 5 to 20 Mbps. You can test your speed with free tools like Speedtest.net to see what you are actually getting.