Frequently Asked Questions
Why is my download slower than my plan advertises?
Advertised speeds are peak values under ideal conditions. Real throughput is reduced by congestion, Wi-Fi interference, disk write speed, and protocol overhead. Budget 70-90% of the advertised rate for planning.
How much overhead should I assume?
About 3% for bulk TCP on a clean low-latency link. For HTTPS, TLS handshake is mostly a one-time cost. For high-latency connections or many small files, effective overhead can reach 10-20%.
What about parallel transfers?
Parallel streams can better saturate a high-bandwidth, high-latency link by keeping the pipe full during ACK delays. Total throughput is still bounded by the bottleneck link's capacity.
How do I measure actual file transfer speed?
Tools like iperf3 measure raw TCP throughput between endpoints. For real-world transfers, rsync --progress or monitoring the network interface with ifstat give measured MB/s you can use here.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.