Tylenol Dosage Calculator

Estimate a weight-based acetaminophen dose (10-15 mg/kg) from body weight, age, and product strength, plus the recommended daily maximum.

Quick Facts

Standard dose
10-15 mg/kg per dose
Given every 4-6 hours as needed, per common weight-based acetaminophen dosing guidance.
Daily ceiling
75 mg/kg/day, capped at 4,000 mg
Never exceed the maximum stated on the product's label in any 24-hour period.

Your Results

Calculated
Single dose
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Weight-based amount (mg)
Amount to give
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In the selected product's units
Daily maximum
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24-hour ceiling (mg)
Dosing frequency
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Doses allowed per 24 hours

Ready

Enter weight, age, dose rate, product, and dosing interval, then calculate.

About the Tylenol dosage calculator

This calculator uses the standard weight-based method for acetaminophen (the active ingredient in Tylenol): a dose of 10 to 15 mg per kilogram of body weight, repeated every 4 to 6 hours as needed, without exceeding a 24-hour maximum. It turns your inputs into a single-dose amount in milligrams, the equivalent quantity of the product you selected, and the daily ceiling that dose fits within.

How the dose is calculated

  • Convert weight to kilograms. Body weight in pounds is divided by 2.2046 to get kilograms.
  • Apply the mg/kg rate. Weight in kilograms is multiplied by the selected dose rate (10, 12.5, or 15 mg/kg) to get the raw single dose.
  • Cap the single dose. The result is capped at a standard ceiling of 650 mg under age 12 and 1,000 mg at age 12 and older, matching common single-dose limits on product labels.
  • Convert to product units. The capped milligram dose is converted to milliliters (liquid) or tablets/caplets, based on the selected product's strength - 160 mg per 5 mL or per chewable tablet, 325 mg per regular-strength tablet, or 500 mg per extra-strength caplet.

The daily maximum

The tool also reports a 24-hour ceiling, calculated as 75 mg per kilogram of body weight and capped at 4,000 mg regardless of weight. Many current OTC labels recommend staying at or below 3,000 mg per day for adults unless a doctor directs otherwise, with no more than 5 doses in any 24-hour period. Always follow the maximum printed on the specific product's label, since concentrations and recommended limits vary by brand and formulation.

Important disclaimer

This tool performs standard weight-based arithmetic for education and planning. It is not a substitute for the product label or medical advice, and it cannot account for liver or kidney disease, other medications that also contain acetaminophen, allergies, or a child's specific health history. Confirm the concentration of the product you have on hand, and consult a pharmacist or physician before dosing an infant, a child with any medical condition, or whenever you are uncertain about a dose.

Frequently Asked Questions

How is a Tylenol (acetaminophen) dose calculated by weight?
The standard weight-based dose is 10 to 15 mg of acetaminophen per kilogram of body weight, given every 4 to 6 hours as needed. This calculator converts weight in pounds to kilograms, multiplies by the selected mg/kg rate, and caps the result at a standard single-dose ceiling (650 mg under age 12, 1,000 mg at 12 and older) before converting to the chosen product's units.
What is the maximum daily dose of acetaminophen?
A commonly cited ceiling is 75 mg per kilogram of body weight per day, not to exceed 4,000 mg total in any 24-hour period. Many current product labels recommend no more than 3,000 mg per day for adults unless a doctor directs otherwise, with doses spaced 4 to 6 hours apart and no more than 5 doses in 24 hours.
Does this calculator give medical advice?
No. It performs standard weight-based arithmetic used in dosing references for education and planning. Always confirm the concentration printed on the product label and consult a pharmacist or physician before dosing a child, or if there is any question about safety.

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