Internet Speed Calculator: Mbps, MB/s and Real-World Speed
Enter a speed in any unit to see it in Mbps, MB/s, Gbps and Kbps, and how many gigabytes it moves per hour and per day. You can also work out your speed from the size and time of a download.
Estimates only. Check important results before you rely on them.
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From related categoriesHow to use this calculator
- Choose whether you know a speed, or the data size and the time taken.
- Enter the speed and its unit, or the size and the time.
- Read the speed in Mbps and MB/s.
- Check the data per hour and the real-world estimate.
The formula
Worked example
100 Mbps is 12.5 MB/s, so it moves about 45 GB per hour and 1,080 GB per day at full speed. A 500 MB download in 1 minute 20 seconds is 4,000 megabits ÷ 80 s = 50 Mbps. A real-world estimate at 90% is 45 Mbps.
Understanding your result
Internet plans are sold in megabits per second, but files are measured in megabytes, so the number on the plan is 8 times the file speed. Real speeds are usually a little lower because of protocol overhead, Wi-Fi and server limits.
When to use it
- Understand what your plan really delivers.
- Compare Mbps and MB/s from different tools.
- Check your speed from a real download.
Assumptions and limits
The 90% estimate is a typical figure, not a guarantee. Your speed varies with the network, device, Wi-Fi and the server.
Frequently asked questions
How many MB/s is 100 Mbps?
12.5 MB/s, since you divide megabits by 8 to get megabytes.
What is the difference between Mbps and MB/s?
Mbps is megabits per second and MB/s is megabytes per second. One byte has 8 bits.
Why is my download slower than my plan?
Overhead, Wi-Fi, other devices and the server all lower the real speed.
How many GB can I download per day at 100 Mbps?
About 1,080 GB at full speed, with no break.
What is 1 Gbps in Mbps?
1,000 Mbps.