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

Ion charges

Signed charges of cations and anions (anions negative).

Extra ion charges

Additional signed charges to include in the balance.

Sum signed ionic charges and check electroneutrality of a species or solution. 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]

Net charge

Net charge after summing all ions.

Balanced

Whether the net charge is exactly zero.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• 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.

• Electron Balance Check

  Check whether total electrons lost in oxidation equal total electrons gained in reduction and report the signed difference.

• Ionic Strength Activity Calculator

  Compute ionic strength I = 0.5 * sum(ci * zi^2) for two ion species.

• Formality Calculator

  Compute formality as formula units dissolved per liter of solution, used for ionic compounds.