Network

MTU MSS Calculator

Calculate effective payload and TCP MSS from MTU and tunnel overhead.

MTU MSS Calculator estimates TCP MSS from link MTU and protocol overhead. It is useful when diagnosing fragmentation, tunnel overhead, and throughput drops. The tool helps you choose safe MSS clamping values for VPN and edge configurations. Use it before rolling out MTU-related network changes.

MTU/MSS Inputs

Result

IP header: 20 bytes

Transport header: 20 bytes

Tunnel overhead: 0 bytes

Max payload: 1460 bytes

TCP MSS: 1460 bytes

How to use this tool

Enter path MTU and protocol options that affect overhead.
Run the calculator to compute effective MSS.
Apply suggested values in test, then validate with packet captures.

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