Bandwidth-Delay Product Calculator
Calculate the amount of data that can be in flight on your network path to determine optimal TCP window size.
Bandwidth-Delay Product (BDP)
= 18,750,000 bytes = 150.00 Mbits
This represents the pipe capacity - the amount of data that must be in flight to fully utilize this link.
CRITICAL: Window Scaling Required
Default TCP window (64 KB) will severely limit throughput:
- Maximum throughput with 64 KB window: 3.50 Mbps
- This is only 0.05% of your available bandwidth!
- Window size needed: âĨ 17.88 MB
- Scale factor required: 512 (2^9)
| Metric | Value | Notes |
|---|---|---|
| Bandwidth | 1.00 Gbps | Available link speed |
| RTT | 150ms | Round-trip time |
| BDP | 17.88 MB | Data in flight for full utilization |
| Min Window Size | 17.88 MB | Absolute minimum |
| Recommended Window | 35.76 MB | 2Ã BDP (allows for variance) |
| Max Useful Window | 71.53 MB | 4Ã BDP (diminishing returns beyond) |
| Packets in Flight | 12,949 | Based on 1448 byte MSS |
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Frequently Asked Questions
Common questions about the TCP Window Size Calculator
The TCP window size determines how much data can be in flight (sent but not yet acknowledged) at any time. It directly impacts network throughput, especially on high-latency or high-bandwidth links. Too small and the link is underutilized. Too large and it wastes memory.
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âšī¸ Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.