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.

Sensor Resistance (Ω) (Ω)

Required number input.

Reference Resistance (Ω) (Ω)

Required number input.

Calculate a resistive gas sensor's dimensionless resistance ratio Rs/R0 from measured sensor and reference resistances; gas concentration needs a separate calibrated curve. 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]

Resistance Ratio

The resulting resistance ratio returned as a number.

• Gas-sensor resistance ratios and sensitivity depend on sensor technology, target gas, concentration, temperature, humidity, heater history, cross-sensitivity, calibration, and aging. They are not direct safety concentration measurements without a validated calibration model.
• 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.

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