How to Use the Network Speed & Bandwidth Calculator
-
1
Enter your network speed and select the unit (Mbps, Gbps, Kbps, MB/s, KB/s).
-
2
Enter a file size to calculate download time.
-
3
View instant conversions across all speed units and the exact download duration.
Practical Example & Use Case
Common Real-World Scenario
Calculating how long a 25 GB game download takes on a 100 Mbps fiber connection (33 minutes 20 seconds).
Technical Notes & Limitations
Browser Engine Architecture
Calculations assume 100% throughput. Real-world overhead typically reduces effective speed by 5–15%.
Frequently Asked Questions
What is the difference between Mbps and MB/s?
Mbps (megabits per second) measures raw network speed. MB/s (megabytes per second) is 8x smaller — 100 Mbps = 12.5 MB/s — which is the actual file transfer rate.
Why is my actual download slower than my plan speed?
Real-world factors include TCP overhead (~5%), server throttling, WiFi signal loss, and network congestion. Calculate realistic speeds at 70–80% of your plan speed.