Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Payload length (B)

Required integer input.

MAC header bytes (B)

Required integer input.

FCS bytes (B)

Required integer input.

Preamble and SFD bytes (B)

Required integer input.

Interframe gap byte times (B)

Required integer input.

Calculate Ethernet overhead percentage from payload, frame-header, FCS, preamble, and interframe-gap byte-equivalent counts. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

On-wire overhead (%)

The resulting on-wire overhead returned as a number.

• Ethernet delay, overhead, magnetics, and link calculations depend on the exact PHY, encoding, frame sizes, cabling category, topology, negotiation, and protocol layers. Application throughput and latency also include queuing, retransmission, and software effects.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• USB Packet Overhead

  Calculate the fraction of an already measured USB packet occupied by non-payload bytes, including protocol fields supplied in total length.

• Battery Capacity Fade

  Calculate capacity loss as a percentage of initial battery capacity, using measurements at comparable discharge rate and temperature.

• Battery Remaining Capacity

  Calculate remaining battery charge in ampere-hours from measured full-charge capacity and state of charge percentage.