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Free Online Packet Payload Calculator

Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Packet Payload Calculator
Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU.
  1. Set Mtu.
  2. Set Overhead.
  3. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU. The example below demonstrates Mtu; Overhead.
Example input:
{
  "mtu": 1500,
  "overhead": 40
}
Expected result (relevant fields):
{
  "payloadBytes": 1460
}
Features & result limitations
Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU.
Frequently asked questions
What inputs does Packet Payload Calculator accept?
Mtu; Overhead
How should I interpret the Packet Payload Calculator result?
Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU.
Where does Packet Payload Calculator process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.