Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Eq potential (V)

Required number input.

Applied potential (V)

Required number input.

Compute signed electrode overpotential eta = E_applied - E_equilibrium on the same reference-electrode scale. 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]

Overpotential (V)

The resulting overpotential returned as a number.

• Electrochemical relationships require consistent sign conventions, electron stoichiometry, electrode area, standard state, and temperature. Overpotential, internal resistance, mass transfer, side reactions, and non-unit activities are not automatically included.
• 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 units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• ISE Potential

  Compute the ion selective electrode potential from an intercept and slope applied to the log of the ion concentration.

• Analytical Spike Recovery

  Calculate percent recovery as (measured spiked result − unspiked result)/known spike amount ×100. All three quantities must use the same unit; values outside 0–100% can reveal matrix effects or measurement problems.

• Bond Length From Order Calculator

  Estimate bond length from bond order using empirical scaling of the single-bond reference length.