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.
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) |
|---|---|---|---|---|
| 3 Mbps | 0.0004 GB | 0.0225 GB | 1.35 GB | 32.4 GB |
| 4 Mbps | 0.0005 GB | 0.03 GB | 1.8 GB | 43.2 GB |
| 5 Mbps | 0.0006 GB | 0.0375 GB | 2.25 GB | 54 GB |
| 6 Mbps | 0.0008 GB | 0.045 GB | 2.7 GB | 64.8 GB |
| 7 Mbps | 0.0009 GB | 0.0525 GB | 3.15 GB | 75.6 GB |
| 8 Mbps | 0.001 GB | 0.06 GB | 3.6 GB | 86.4 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 |
| 35 Mbps | 0.0044 GB | 0.2625 GB | 15.75 GB | 378 GB |
| 40 Mbps | 0.005 GB | 0.3 GB | 18 GB | 432 GB |
| 45 Mbps | 0.0056 GB | 0.3375 GB | 20.25 GB | 486 GB |
| 50 Mbps | 0.0063 GB | 0.375 GB | 22.5 GB | 540 GB |
| 60 Mbps | 0.0075 GB | 0.45 GB | 27 GB | 648 GB |
| 65 Mbps | 0.0081 GB | 0.4875 GB | 29.25 GB | 702 GB |
| 70 Mbps | 0.0088 GB | 0.525 GB | 31.5 GB | 756 GB |
| 72 Mbps | 0.009 GB | 0.54 GB | 32.4 GB | 777.6 GB |
| 77 Mbps | 0.0096 GB | 0.5775 GB | 34.65 GB | 831.6 GB |
| 80 Mbps | 0.01 GB | 0.6 GB | 36 GB | 864 GB |
| 88 Mbps | 0.011 GB | 0.66 GB | 39.6 GB | 950.4 GB |
| 89 Mbps | 0.0111 GB | 0.6675 GB | 40.05 GB | 961.2 GB |
| 91 Mbps | 0.0114 GB | 0.6825 GB | 40.95 GB | 982.8 GB |
| 92 Mbps | 0.0115 GB | 0.69 GB | 41.4 GB | 993.6 GB |
| 93 Mbps | 0.0116 GB | 0.6975 GB | 41.85 GB | 1004.4 GB |
| 95 Mbps | 0.0119 GB | 0.7125 GB | 42.75 GB | 1026 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 |
| 350 Mbps | 0.0438 GB | 2.625 GB | 157.5 GB | 3780 GB |
| 400 Mbps | 0.05 GB | 3 GB | 180 GB | 4320 GB |
| 450 Mbps | 0.0563 GB | 3.375 GB | 202.5 GB | 4860 GB |
| 500 Mbps | 0.0625 GB | 3.75 GB | 225 GB | 5400 GB |
| 550 Mbps | 0.0688 GB | 4.125 GB | 247.5 GB | 5940 GB |
| 600 Mbps | 0.075 GB | 4.5 GB | 270 GB | 6480 GB |
| 680 Mbps | 0.085 GB | 5.1 GB | 306 GB | 7344 GB |
| 686 Mbps | 0.0858 GB | 5.145 GB | 308.7 GB | 7408.8 GB |
| 700 Mbps | 0.0875 GB | 5.25 GB | 315 GB | 7560 GB |
| 750 Mbps | 0.0938 GB | 5.625 GB | 337.5 GB | 8100 GB |
| 800 Mbps | 0.1 GB | 6 GB | 360 GB | 8640 GB |
| 867 Mbps | 0.1084 GB | 6.5025 GB | 390.15 GB | 9363.6 GB |
| 900 Mbps | 0.1125 GB | 6.75 GB | 405 GB | 9720 GB |
| 940 Mbps | 0.1175 GB | 7.05 GB | 423 GB | 10152 GB |
| 950 Mbps | 0.1188 GB | 7.125 GB | 427.5 GB | 10260 GB |
| 1000 Mbps | 0.125 GB | 7.5 GB | 450 GB | 10800 GB |
| 2000 Mbps | 0.25 GB | 15 GB | 900 GB | 21600 GB |
| 2100 Mbps | 0.2625 GB | 15.75 GB | 945 GB | 22680 GB |
| 2400 Mbps | 0.3 GB | 18 GB | 1080 GB | 25920 GB |
| 2402 Mbps | 0.3003 GB | 18.015 GB | 1080.9 GB | 25941.6 GB |
| 2500 Mbps | 0.3125 GB | 18.75 GB | 1125 GB | 27000 GB |
| 3000 Mbps | 0.375 GB | 22.5 GB | 1350 GB | 32400 GB |
| 3200 Mbps | 0.4 GB | 24 GB | 1440 GB | 34560 GB |
| 3600 Mbps | 0.45 GB | 27 GB | 1620 GB | 38880 GB |
| 4000 Mbps | 0.5 GB | 30 GB | 1800 GB | 43200 GB |
| 4400 Mbps | 0.55 GB | 33 GB | 1980 GB | 47520 GB |
| 4804 Mbps | 0.6005 GB | 36.03 GB | 2161.8 GB | 51883.2 GB |
| 5000 Mbps | 0.625 GB | 37.5 GB | 2250 GB | 54000 GB |
| 5400 Mbps | 0.675 GB | 40.5 GB | 2430 GB | 58320 GB |
| 5700 Mbps | 0.7125 GB | 42.75 GB | 2565 GB | 61560 GB |
| 6000 Mbps | 0.75 GB | 45 GB | 2700 GB | 64800 GB |
| 6600 Mbps | 0.825 GB | 49.5 GB | 2970 GB | 71280 GB |
| 7000 Mbps | 0.875 GB | 52.5 GB | 3150 GB | 75600 GB |
| 7800 Mbps | 0.975 GB | 58.5 GB | 3510 GB | 84240 GB |
| 8000 Mbps | 1 GB | 60 GB | 3600 GB | 86400 GB |
| 8700 Mbps | 1.0875 GB | 65.25 GB | 3915 GB | 93960 GB |
| 9000 Mbps | 1.125 GB | 67.5 GB | 4050 GB | 97200 GB |
| 9834 Mbps | 1.2293 GB | 73.755 GB | 4425.3 GB | 106207.2 GB |
| 20000 Mbps | 2.5 GB | 150 GB | 9000 GB | 216000 GB |
| 30000 Mbps | 3.75 GB | 225 GB | 13500 GB | 324000 GB |
| 40000 Mbps | 5 GB | 300 GB | 18000 GB | 432000 GB |
| 50000 Mbps | 6.25 GB | 375 GB | 22500 GB | 540000 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.