MTU / MSS Calculator

Calculate IPv4/IPv6 TCP MSS or UDP payload after headers and encapsulation overhead.

Private-first · runs on your device Ready

MTU (bytes)IP version

TransportExtra encapsulation overhead (bytes)

TCP options (bytes)

Choose All to calculate every applicable IPv4/IPv6 and TCP/UDP combination in one run.

How it works

MTU / MSS Calculator is designed to give you the result immediately. The calculation or processing happens on your device for this tool, so normal use does not require an account or a file upload.

Privacy

This tool is marked offline-capable. Your inputs are used in the current browser/app session and are not required to be sent to Wiunix Tools to perform the operation.