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MTU Overhead Calculator

Enter your link MTU and choose an encapsulation type to calculate the effective payload MTU after overhead.

How to use this tool

  1. 1Enter your link's MTU in bytes.
  2. 2Choose an encapsulation preset or enter a custom overhead.
  3. 3See the effective payload MTU.

Frequently asked questions

Why does PPPoE reduce MTU to 1492?+

PPPoE adds an 8-byte header on top of standard 1500-byte Ethernet, leaving 1492 bytes for the actual payload — a very common real-world MTU value on DSL connections.

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