Convert Internet Speed to Data Usage
If you've ever looked at your internet plan and wondered how much data you're actually going through — this guide is for you. We'll break down exactly what Mbps and GB mean, show you the simple formula to convert between them, and give you real-world examples so you always know where you stand.
To convert Mbps to GB per hour, multiply Mbps by 3,600 and divide by 8,000 (Formula: GB/hr = Mbps × 0.45). A 100 Mbps connection transfers exactly 45 GB per hour at theoretical max, or approximately 41.4 GB per hour under real-world 8% network protocol overhead.
Table of Contents
What does Mbps to GB actually mean?
Let's start with the basics, because this is where most people get confused.
Mbps
Stands for megabits per second. It's the unit your internet provider uses to describe your connection speed — how fast data travels to and from your device. When your plan says "100 Mbps," that's how quickly you can download or upload data.
GB
Stands for gigabyte. It's a unit of data storage and volume — how much data you've transferred in total. Your mobile carrier uses GB when they say "you have 5 GB of data left this month."
The reason people need to convert between the two is simple: your internet provider tells you your speed in Mbps, but your data cap is measured in GB. Knowing how to convert between them tells you exactly how long it takes to burn through your data allowance — or how quickly you can download a large file.
How to convert Mbps to GB: the formula explained
There's one formula you need to know:
That's it. Multiply your speed in Mbps by the number of seconds, then divide by 8,000.
Why 8,000? Two reasons stacked together: there are 8 bits in a byte (which converts megabits to megabytes), and there are 1,000 megabytes in a gigabyte. Multiply those together and you get 8,000.
Step-by-step example: how much data does my connection use in 1 hour?
Let's say you have a 100 Mbps internet connection and you leave it running for 1 hour. How many GB could it theoretically transfer?
- Step 1: Convert 1 hour to seconds. 1 hour = 3,600 seconds.
- Step 2: Multiply speed by seconds. 100 Mbps × 3,600 = 360,000
- Step 3: Divide by 8,000. 360,000 ÷ 8,000 = 45 GB
So a 100 Mbps connection running at full speed for one hour can transfer up to 45 GB of data.
Why do you divide by 8?
This trips people up all the time, so here's a clear explanation.
Internet speeds are measured in bits. File sizes and data caps are measured in bytes. Following the universal digital standard, one byte equals exactly 8 bits. So if your connection downloads at 100 megabits per second, it's actually moving 100 ÷ 8 = 12.5 megabytes per second.
This is also why your internet feels slower than advertised when downloading files — a 100 Mbps connection downloads at about 12.5 MB/s, not 100 MB/s. Your browser's download speed is shown in megabytes, not megabits.
Visualizer: 1 Byte = 8 Bits
Common Conversions: Mbps to GB
| Speed (Mbps) | Per Second (GB) | Per Minute (GB) | Per Hour (GB) | Per Day (GB) |
|---|---|---|---|---|
| 1 Mbps | 0.0001 GB | 0.0075 GB | 0.45 GB | 10.8 GB |
| 5 Mbps | 0.0006 GB | 0.0375 GB | 2.25 GB | 54 GB |
| 10 Mbps | 0.0013 GB | 0.075 GB | 4.5 GB | 108 GB |
| 20 Mbps | 0.0025 GB | 0.15 GB | 9 GB | 216 GB |
| 25 Mbps | 0.0031 GB | 0.1875 GB | 11.25 GB | 270 GB |
| 30 Mbps | 0.0038 GB | 0.225 GB | 13.5 GB | 324 GB |
| 50 Mbps | 0.0063 GB | 0.375 GB | 22.5 GB | 540 GB |
| 100 Mbps | 0.0125 GB | 0.75 GB | 45 GB | 1080 GB |
| 200 Mbps | 0.025 GB | 1.5 GB | 90 GB | 2160 GB |
| 300 Mbps | 0.0375 GB | 2.25 GB | 135 GB | 3240 GB |
| 400 Mbps | 0.05 GB | 3 GB | 180 GB | 4320 GB |
| 500 Mbps | 0.0625 GB | 3.75 GB | 225 GB | 5400 GB |
| 1000 Mbps | 0.125 GB | 7.5 GB | 450 GB | 10800 GB |
| 2000 Mbps | 0.25 GB | 15 GB | 900 GB | 21600 GB |
Real-world data usage examples by connection speed
| Activity / Speed | 1 minute | 10 minutes | 1 hour | 8 hours |
|---|---|---|---|---|
| Slow broadband (10 Mbps) | 0.075 GB | 0.75 GB | 4.5 GB | 36 GB |
| Standard broadband (50 Mbps) | 0.375 GB | 3.75 GB | 22.5 GB | 180 GB |
| Fast broadband (100 Mbps) | 0.75 GB | 7.5 GB | 45 GB | 360 GB |
| Superfast (500 Mbps) | 3.75 GB | 37.5 GB | 225 GB | 1,800 GB |
| Gigabit (1,000 Mbps) | 7.5 GB | 75 GB | 450 GB | 3,600 GB |
To put this in context with real activities:
- Streaming Netflix in HD uses roughly 3 GB per hour
- A 4K YouTube video uses around 7–10 GB per hour
- Online gaming typically uses 0.05–0.3 GB per hour
- A video call on Zoom uses roughly 0.9 GB per hour
- Downloading a 50 GB game on a 100 Mbps connection takes about 1 hour 7 minutes
Mbps vs MB/s vs GB: clearing up the confusion
These three units look almost identical but mean very different things. Here's a plain-English breakdown:
| Unit | Stands for | Used for | Example |
|---|---|---|---|
| Mbps | Megabits per second | Internet connection speed | Your broadband plan: 100 Mbps |
| MB/s | Megabytes per second | File transfer / download speed | Download speed in your browser: 12.5 MB/s |
| GB | Gigabytes | Data volume / storage | Mobile data cap: 10 GB per month |
| Gbps | Gigabits per second | Very fast connections | Gigabit broadband: 1 Gbps |
The most common source of confusion: people see their download speed in their browser (say, 12.5 MB/s) and think their 100 Mbps connection is broken. It's not — 100 Mbps ÷ 8 = 12.5 MB/s. They are the same speed expressed in different units.
Frequently asked questions
How many GB is 100 Mbps per hour?
A 100 Mbps connection running at full capacity for one hour transfers 45 GB of data. Here's the math: 100 × 3,600 seconds ÷ 8,000 = 45 GB.
In practice, you'll use much less than this. Applications don't use 100% of your bandwidth continuously. A full evening of HD streaming, gaming, and browsing on a 100 Mbps connection might use 5–15 GB total.
How long does it take to download 1 GB?
It depends on your connection speed. Use the interactive slider below to see how long it takes:
Formula: Download time (seconds) = (File size in GB × 8,000) ÷ Mbps
Is Mbps the same as MB per second?
No, and this is the most common confusion. Mbps = megabits per second. MB/s = megabytes per second. Since 1 byte = 8 bits, 1 MB/s = 8 Mbps.
So a 100 Mbps connection downloads at 12.5 MB/s — not 100 MB/s. If your download manager shows MB/s, divide your Mbps speed by 8 to know what to expect.
How do I check my internet speed in Mbps?
Run a speed test at speedtest.net, fast.com, or through an open-source global project like Measurement Lab (M-Lab). These tools measure your actual download and upload speeds in Mbps and will show you if you're getting the speeds you're paying for.
Run the test on a device connected via ethernet (not Wi-Fi) for the most accurate result. Wi-Fi can reduce your effective speed by 20–50% depending on your router and distance.