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MTU Calculator

Calculate effective MTU with stacked encapsulations and TCP MSS

The base MTU of the physical interface. Standard Ethernet is 1500 bytes. Jumbo frames can be 9000+ bytes.
bytes
Select encapsulation types to stack. Each adds overhead bytes that reduce the effective MTU for payload data. Multiple encapsulations can be stacked (e.g., VXLAN over IPsec).

MTU Results

Base MTUbytes
Total Overheadbytes
Effective MTUbytes
TCP MSS (IPv4)bytes
TCP MSS (IPv6)bytes
Overhead Percentage%
References:
RFC 791 - IPv4 (20-byte header), RFC 793 - TCP (20-byte header)
RFC 8200 - IPv6 (40-byte header)
TCP MSS = Effective MTU - IP Header - TCP Header