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.

Frequency (Hz) (Hz)

Required number input.

Reader Power (W) (W)

Required number input.

Reader Gain Linear

Required number input.

Tag Gain Linear

Required number input.

Tag Activation Power (W) (W)

Required number input.

Estimate free-space RFID forward-link range by the Friis equation from frequency, reader transmitted power, linear antenna gains, and tag activation power; reverse-link and regulatory limits are excluded. 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]

Range (m) (m)

The resulting range (m) returned as a number.

• RFID range depends on frequency, permitted transmit power, antenna orientation and polarization, tag sensitivity, matching, object materials, multipath, reader threshold, modulation, and regional regulations. A free-space estimate does not guarantee reads in the deployed environment.
• 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.

• FSPL Calculator

  Calculate free-space path loss in decibels for a link distance and frequency.

• Friis Received Power

  Calculate received power for a line-of-sight link using the Friis transmission equation.

• ADC Quantization Error Bound

  Calculate the ideal rounding quantizer's maximum absolute error as half an ADC LSB. Assumes a uniform quantizer and input within the conversion range; offset, gain, and noise errors are excluded.