Electrochemical equivalents calculator
Turn the charge passed through a cell into electrochemical equivalents: 96,485.3321 coulombs is exactly one equivalent, one faraday and one mole of electrons. Handy for checking Faraday's law homework and plating balances. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Charge
- 96,485.3321
- Equivalents
- 1
- Faradays
- 1
- Moles electrons
- 1
In electrolysis, the amount of substance deposited or liberated at an electrode is measured in electrochemical equivalents: one faraday of charge corresponds to one gram-equivalent of material. Given the total charge that has passed through the cell, this capability returns the number of equivalents using the Faraday constant, a single deterministic division with no tables, no network calls, and no random drift. Students use it to check homework on Faraday's laws, coulometry, and plating stoichiometry; lab scripts and manufacturing sandboxes use the same contract to pin expected equivalent counts in tests. Negative charge is rejected as invalid input because a deposition balance cannot be driven by a negative coulomb total in this product.
What electrochemical equivalents mean and how the formula works
Faraday's laws of electrolysis connect electric charge to chemical amount. The Faraday constant F is the magnitude of electric charge per mole of electrons—about ninety-six thousand four hundred eighty-five coulombs per equivalent when charge is expressed in SI coulombs. Dividing the charge passed Q by F yields the number of gram-equivalents of substance that can be oxidized or reduced under ideal faradaic conditions: eq equals Q over F.
For monovalent ions such as silver one-plus or chloride one-minus, one equivalent equals one mole; for divalent copper two-plus, one mole is two equivalents, so converting equivalents to moles requires the n-factor outside this calculator. Zero charge is allowed and returns zero equivalents.
Lab uses and practical limits
If you know current and time instead of charge, first compute Q equals I times t with a charge-from-current tool, then pass that Q here. This product assumes one hundred percent current efficiency; if your cell wastes charge on side reactions, scale the result by efficiency outside this capability. Keep inputs within ordinary lab ranges—from microcoulombs in microelectrodes to multi-megacoulomb industrial baths—and prefer classroom-scale numbers for grading oracles.
Source inputs follow the same retention rules as other KIT parse items, and results are safe to pin because the algorithm is fully deterministic.
What you can do with it
Homework and exam verification
Students and graders convert a measured or calculated charge into electrochemical equivalents with eq = Q/F, and get a clear error when negative charge is submitted by mistake.
Coulometry and plating balances
Lab and shop scripts turn coulomb totals from current–time logs into equivalent counts for deposition accounting without reimplementing Faraday arithmetic in every spreadsheet.
FAQ
How do I calculate electrochemical equivalents from charge?
The response includes equivalents via eq = Q / F, where F is the Faraday constant 96485.3321 C/eq.
What happens if charge is negative?
Negative charge is rejected for deposition accounting and is not billed.
Is the electrochemical equivalents calculator free?
The browser tool runs free on your device.
Does this return mass deposited?
No. It returns equivalents (and the same numeric faradays and moles of electrons). Multiply by equivalent weight or use a Faraday mass calculator for grams.
How do I turn equivalents into moles of metal deposited?
Divide the equivalents by the ion's charge number. For silver one-plus, one equivalent is one mole; for copper two-plus, one mole is two equivalents. That last step uses the n-factor, which you apply outside this calculator.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/chem/equivalents-from-charge \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"charge":96485.3321}'const res = await fetch("https://api.kit.forhosting.com/chem/equivalents-from-charge", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"charge": 96485.3321
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/chem/equivalents-from-charge",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"charge": 96485.3321
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/chem/equivalents-from-charge", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"charge":96485.3321}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"charge":96485.3321}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/chem/equivalents-from-charge", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"charge": 96485.3321
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "chem.equivalents_from_charge",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
The browser path runs free on your device; the prepaid API charges $0.002 per successful item when servers and SDKs need identical arithmetic under KIT balance.
What electrochemical equivalents mean and how the formula works
Send a JSON object with the required field charge as a finite non-negative number of coulombs, or use documented aliases such as Q, coulombs, charge_C, and charge_coulombs so client code can speak laboratory English. Negative charge fails with invalid_input because this product models charge passed for deposition accounting, not signed current integrals.
Reading the response fields and relating equivalents to electrons
The primary result is equivalents, the number of gram-equivalents corresponding to that charge. The constants block documents the Faraday constant F used and the unit labels for charge, equivalents, faradays, and moles of electrons. The same numeric value is also exposed as faradays, meaning faradays of electricity transferred, and as moles_electrons, because one faraday equals one mole of electrons equals one equivalent on this scale. The formula string is always eq equals Q over F, and the method label is always faraday_equivalents so downstream code can branch without sniffing payload shapes. Use equivalents alone when a report needs a single deposition-balance figure; use moles_electrons when grading software must align with electron-count wording in a textbook; use faradays when the course language prefers historical coulometry units. Missing charge, non-finite numbers, empty strings, and negative charge all fail with invalid_input and are not charged after the engine rejects the request. This calculator does not multiply by molar mass or divide by valence—pair it with mass or equivalent-weight tools when you need grams rather than equivalents.
API usage, pricing, lab workflows, and practical limits
Send a JSON body with charge in coulombs and call the free in-browser electrochemical equivalents calculator for homework checks, lecture demos, and quick coulometry estimates without installing a spreadsheet or a local electrochemistry toolkit. Use the prepaid API when a tutoring platform, process-control sandbox, curriculum generator, or electroplating pipeline needs a stable contract under KIT balance at $0.002 per successful item; validation failures never consume balance after the engine rejects the request. Authors shipping SDKs can map equivalents, faradays, and moles_electrons directly into UI tables that mirror the worked example students write when they apply Faraday's law by hand.
Integration use cases
Tutoring and curriculum generators
Lesson builders produce worked Faraday-equivalent examples with structured JSON for flashcards, step sheets, and auto-graded electrochemistry drills.
Technical questions
What is the Faraday constant used here?
F = 96485.3321 C/eq (coulombs per equivalent), the same numeric value as C per mole of electrons.