MTU Size Finder / Calculator

How to use MTU Size Finder / Calculator

Enter a link budget, choose IPv4 or IPv6, transport and optional PPPoE overhead. Calculate the IP MTU, modeled payload and minimum-header TCP MSS. This is a browser calculation and does not probe a live path. Options, extensions and tunnels are excluded.

Is this tool free?

You can complete three tools as a guest across this collection. Continue with Google for further use. Failed operations do not consume a successful use.

Where is my content processed?

Live diagnostics send the public target to our configured worker. Speed transfers go directly between your browser and the worker using a short-lived ticket. MTU calculator inputs remain on your device. Targets and transfer contents are not stored in usage analytics.

What does the result mean?

Read the source and assumptions in the report. Live diagnostics describe the worker path, speed tests describe browser-to-worker transfers, and WiFi/MTU calculators model the entered values. Live tests run when their service is available.

Can I use MTU Size Finder / Calculator without signing up?

Yes. You can complete three successful operations across this tools collection as a guest. Continue with Google for further use. Failed operations do not reduce the successful-use allowance.

Does MTU Size Finder / Calculator store my inputs in analytics?

Usage analytics record the tool, account or browser identity, status and time, without storing input text, passwords, tokens or file contents. Live targets are sent through our server to the configured diagnostics worker. Speed traffic goes directly between your browser and that worker. Worker tickets and verification counters are short lived; lookup targets are not stored in usage analytics. MTU calculator inputs stay on your device.