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.

Nominal resistance (Ω)

Unstrained resistance of the gauge.

Strain

Mechanical strain as a fractional elongation.

Gauge factor

Gauge factor relating strain to fractional resistance change.

Compute the resistance change of a strain gauge from its gauge factor, nominal resistance, and strain. 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 change (Ω)

Signed magnitude of the resistance change.

• Strain-gauge output depends on gauge factor, bridge configuration, excitation, lead resistance, transverse sensitivity, temperature compensation, bonding, alignment, creep, and amplifier offset. Mechanical strain transfer and calibration determine measurement accuracy.
• 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.

• Strain Gauge Resistance Change

  Compute ΔR=GF·ε·R₀ from gauge factor, dimensionless strain, and initial resistance. This linear approximation applies to small strain and does not include temperature compensation.

• Strain Gauge Bridge Output

  Calculate the exact ideal quarter-bridge voltage change for one active strain-gauge arm from excitation voltage, gauge factor, and mechanical strain; bridge polarity follows the changed arm.

• ESR From Q

  Derive the equivalent series resistance of a component from its reactance and quality factor.