⬇️ Bandwidth Calculator
File sizes are measured in megabytes while internet speeds are sold in megabits — eight bits to a byte — which is why a 100 MB file on a 20 Mbps line takes 40 seconds, not 5. This calculator does that conversion for you.
The result assumes your full rated speed with no overhead. Real downloads run a little slower because of network protocol overhead and congestion.
How to use this calculator
Enter the file size in megabytes and your connection speed in megabits per second. The calculator converts bits to bytes and shows the download time in minutes, seconds and total seconds.
- Type the File size in megabytes.
- Type your Bandwidth in megabits per second.
- Read the download time instantly.
- Remember real downloads run a little slower than the ideal figure.
Frequently asked questions
What does the Bandwidth Calculator compute?
It estimates how long a download takes from the file size and your connection speed. Because speeds are sold in megabits and files are measured in megabytes, it multiplies megabytes by 8 before dividing by megabits per second.
What is the formula?
Time in seconds equals file size in megabytes times 8, divided by bandwidth in megabits per second. The result is also shown as minutes and seconds.
Can you give a worked example?
A 100 megabyte file on a 20 megabit per second connection takes 40 seconds, shown as 0 min 40 sec.
Why is my real download slower?
The calculation assumes your full rated speed with zero overhead. Protocol overhead, network congestion, Wi-Fi signal quality and the server's own limits all add time in practice.