Electrolysis Calculator (Faraday’s Law)
Electrolysis calculator (Faraday’s laws): mass of metal deposited, current or time needed, from current, time, molar mass and ion charge.
m = I · t · Mz · F
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
m = I t M ÷ (z F), where F = 96,485 C/mol. Used in electroplating, refining and battery chemistry.
Formula
m = I · t · Mz · F
| Symbol | Quantity | Units |
|---|---|---|
| I | Current | A, mA, µA, kA |
| t | Time | s, ms, µs, ns, min, h, d, wk, yr |
| M | Molar mass of the substance | g/mol, kg/mol |
| z | Electrons per ion (Cu²⁺ = 2) | — |
| m | Mass deposited | kg, g, mg, µg, t, lb, oz, st, US ton, ct, Da |
Constants used: F = 96,485.33 C/mol
Worked example
Given: I = 2 A · t = 1 h · M = 63.546 g/mol · z = 2
m = I t Mz F
Result: m = 2.37099 g
Mass deposited for different values of Current
| I · Current | m · Mass deposited |
|---|---|
| 1 A | 1.1855 g |
| 1.5 A | 1.7782 g |
| 1.8 A | 2.1339 g |
| 2 A | 2.371 g |
| 2.2 A | 2.6081 g |
| 2.5 A | 2.9637 g |
| 3 A | 3.5565 g |
| 4 A | 4.742 g |
Other values as in the worked example.
Frequently asked questions
Copper (63.55 g/mol, Cu²⁺) at 2 A for 1 hour?
About 2.37 g.
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