Tylenol overdose calculator
A 70 kg adult who swallowed 7,000 mg of acetaminophen has taken 100 mg per kilogram: the possible-risk band, below the 150 mg/kg treatment line. An educational first check, never a replacement for emergency care. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Dose
- 7,000
- Weight
- 70
- Dose mg per kg
- 100
- Risk level
- possible
- Treatment threshold mg per kg
- 150
- Treatment threshold mg
- 10,500
Acetaminophen, sold as Tylenol and as paracetamol in many countries, is safe at labeled doses and dangerous in a single large ingestion because the liver's glutathione stores can be exhausted and a reactive metabolite then injures hepatocytes. This Tylenol overdose calculator takes a strictly positive ingested dose in milligrams and a strictly positive patient body weight in kilograms, divides milligrams by kilograms, and maps the milligrams-per-kilogram result onto an educational acute-ingestion risk band. It also reports whether the classic one-hundred-fifty milligrams-per-kilogram treatment threshold used in teaching tables has been reached or exceeded.
How milligrams per kilogram and the treatment flag are computed
A seventy-kilogram adult who ingested seven thousand milligrams therefore presents one hundred milligrams per kilogram; a twenty-kilogram child who ingested four thousand milligrams presents two hundred milligrams per kilogram, which is why the same household bottle is not the same risk once weight enters the identity. After the ratio is formed, the engine places it on a four-band educational scale.
Below seventy-five milligrams per kilogram the level is low, the band where a single acute ingestion is taught as unlikely to exhaust glutathione stores in a patient without special risk factors. From seventy-five up to but not including one hundred fifty the level is possible, the band some protocols treat as concerning in high-risk or staggered ingestions while remaining below the classic one-hundred-fifty milligrams-per-kilogram treatment line.
From one hundred fifty up to but not including three hundred fifty the level is probable, and at three hundred fifty milligrams per kilogram and above the level is high, the band associated in teaching tables with a substantial chance of severe hepatotoxicity. Rounding is stable across JavaScript runtimes so goldens compare byte for byte.
Convert tablet counts and liquid volumes yourself using the milligram strength printed on the product you actually have, so a five-hundred-milligram extra-strength tablet is not silently treated as a three-hundred-twenty-five-milligram regular tablet. Optional output keys are omitted rather than set to null. Weight above four hundred kilograms is rejected so a pounds-versus-kilograms mix-up fails closed instead of silently understating milligrams per kilogram.
Dose above two hundred thousand milligrams is rejected as out of range for a single-ingestion worksheet. Failed validation is not billed. This engine does not plot a Rumack-Matthew nomogram, does not ingest a serum acetaminophen concentration or a time since ingestion, and does not decide whether to start N-acetylcysteine.
Where a Tylenol overdose calculator earns its keep
Emergency-line scripts and poison-center intake pages use a Tylenol overdose calculator so a caller can turn a guessed tablet count, a labeled milligram strength, and a last known body weight into one comparable milligrams-per-kilogram number and a yes-or-no treatment-threshold flag before a clinician takes over. Pharmacy and nursing teaching labs assign the same identity so students see why a seventy-kilogram adult at seven thousand milligrams lands in the possible band below the one-hundred-fifty milligrams-per-kilogram line, while a twenty-kilogram child at four thousand milligrams already exceeds it.
Clinic discharge sheets and after-hours forms keep the arithmetic next to the acetaminophen bottle because combination cold products hide the same drug under different brand names, and a second source of milligrams is easy to miss when someone is counting only the Tylenol caplets. Failed validation does not consume balance.
The calculator does not replace emergency care, does not adjust for chronic heavy alcohol use, malnutrition, or enzyme-inducing medicines that some protocols treat as high-risk at a lower milligram line, and does not convert pounds or ounces for you: send milligrams and kilograms so unit mistakes stay visible instead of being hidden by a silent conversion.
What you can do with it
Emergency-line and poison-center intake
Turn a reported tablet count converted to milligrams and a last known body weight into one milligrams-per-kilogram figure and a treatment-threshold flag a clinician can read before serum results exist.
Pharmacy and nursing teaching labs
Give students the same milligram ingestion at two different weights so they can see why a child crosses the one-hundred-fifty milligrams-per-kilogram line when an adult with the same tablet count does not.
FAQ
How is Tylenol overdose risk calculated from dose and weight?
Divide the ingested acetaminophen amount in milligrams by body weight in kilograms.
What happens if dose or weight is zero, negative, or missing?
Both dose in milligrams and weight in kilograms must be strictly positive finite numbers. Zero, negative, NaN, Infinity, and non-numeric values are rejected and are not billed.
Is this calculator a diagnosis or a substitute for emergency care?
No. It returns an educational milligrams-per-kilogram estimate for a reported acute ingestion. It does not plot a serum-level nomogram, does not read time since ingestion, and does not decide whether to start antidote. Seek emergency care for a suspected overdose.
When is the treatment threshold reached?
When the dose reaches 150 mg per kilogram or more. For a 70 kg adult that line sits at 10,500 mg, so 7,000 mg stays below it. Seek emergency care for any suspected overdose, whatever the number says.
How do I turn a tablet count into milligrams?
Multiply the number of tablets by the strength on the label; extra-strength tablets are often 500 mg each. For liquids, multiply millilitres by the milligrams per millilitre shown, and add any acetaminophen from combination cold products.
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/health/tylenol-overdose \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"dose":7000,"weight":70}'const res = await fetch("https://api.kit.forhosting.com/health/tylenol-overdose", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"dose": 7000,
"weight": 70
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/health/tylenol-overdose",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"dose": 7000,
"weight": 70
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/tylenol-overdose", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"dose":7000,"weight":70}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"dose":7000,"weight":70}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/tylenol-overdose", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"dose": 7000,
"weight": 70
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "health.tylenol_overdose",
"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
Dose or weight that is missing, zero, negative, or not a finite number fails with invalid_input instead of inventing a risk level. The same pure arithmetic runs free in the browser and over the API at $0.002 per successful call. This is an educational first-pass estimate, not a diagnosis, not a serum-level nomogram, and not a substitute for emergency care.
How milligrams per kilogram and the treatment flag are computed
The identity behind this Tylenol overdose calculator is a milligrams-per-kilogram dose: the ingested acetaminophen amount in milligrams divided by the patient's body weight in kilograms. That single ratio is the unit used in emergency-medicine teaching tables for an acute, one-time ingestion when a timed serum concentration is not yet available. Extra-strength tablets are often five hundred milligrams each, so a bottle count can be converted to milligrams before the call; liquid suspensions list milligrams per millilitre on the label, and that milligram product is what this engine expects. The boolean treatment_threshold_exceeded is true exactly when the milligrams-per-kilogram dose is at least one hundred fifty, matching that classic treat-if-acute teaching line, and false otherwise. Dose and weight must both be strictly positive finite numbers: zero, negative, missing, NaN, Infinity, and non-numeric strings fail with invalid_input naming the field, because a hollow risk band from a bad scale reading is worse than an honest error.
Input contract, response shape, and errors
POST a JSON body with two required fields. dose is the ingested acetaminophen amount in milligrams; aliases include dose_mg, ingested_mg, acetaminophen_mg, amount_mg, and mg. weight is the patient body mass in kilograms; aliases include weight_kg, body_weight, kg, mass, and patient_weight. Each numeric field may arrive as a JSON number or as a numeric string. On success the body echoes the cleaned dose and weight, returns dose_mg_per_kg as the primary milligrams-per-kilogram figure, names risk_level as one of low, possible, probable, or high, and sets treatment_threshold_exceeded to a boolean. treatment_threshold_mg_per_kg is always one hundred fifty so a client can draw the teaching line without re-encoding the table; treatment_threshold_mg is that line times this patient's weight, the milligram amount at which this specific person would meet the threshold. The formula string, the method name acetaminophen_mg_per_kg_band, and a note that this is an educational acute-ingestion estimate rather than a diagnosis travel with every success. A missing field, a zero, a negative, NaN, Infinity, or a non-numeric string fails with invalid_input naming the field.
Where a Tylenol overdose calculator earns its keep
Keep requests small, pin dose_mg_per_kg, risk_level, and treatment_threshold_exceeded in continuous integration, and you get reproducible educational numbers for LMS plugins, edge workers, and form prefill without standing up a clinical decision-support system.
Integration use cases
Form prefill and spreadsheet checks
Pin dose_mg_per_kg, risk_level, and treatment_threshold_exceeded in continuous integration so an intake form never silently treats a zero weight as a low-risk adult.
Technical questions
When is the treatment threshold exceeded?
treatment_threshold_exceeded is true when dose_mg_per_kg is at least 150, the classic acute-ingestion teaching line. It is false below that line, including in the possible band from 75 up to 150. The response also reports treatment_threshold_mg, which is 150 times this patient's weight in kilograms.
What does the Tylenol overdose calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.