Electrochemistry lab tool
Fill any three values and the calculator will determine the missing fourth parameter: substrate amount, current, charge equivalents, or electrolysis time.
Leave the value you want to calculate empty.
Inputs
Reaction parameters
Results
Calculated output
Time result
Not set
Calculation summary
Enter any three parameters and leave the fourth blank.
Method
Charge, current, and electrolysis time
Q = It and Q = nszF, where Q is charge in coulombs, I is current in amperes, t is time in seconds, ns is substrate amount in moles, z is the entered charge equivalents in F mol⁻¹ of substrate, and F is 96,485.33212 C mol⁻¹.
Worked example
Passing 2.00 F through 0.50 mmol substrate requires 96.49 C. At a constant current of 10.0 mA, the calculated electrolysis time is approximately 2 h 40 min 49 s.
Limitations: this is a charge balance. It does not predict conversion, current efficiency, competing electrochemical processes, mass transport, electrode passivation, changing cell resistance, or changes in current during controlled-potential electrolysis.
Tool version 1.1, released 21 July 2026. Faraday constant from the NIST Reference on Constants. The worked example above is the calculation check used for version 1.1.