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Estimate acetaminophen dosing (brand example: Tylenol) for adults using common tablet strengths and a conservative 3000 mg/day OTC planning ceiling from all sources, or compute pediatric 10–15 mg/kg doses with typical caps. Some supervised regimens may reference up to about 4000 mg/day—follow your label and clinician, not this page.
Last updated: April 20, 2026
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Single dose
270 mg
Conservative daily ceiling
1350 mg
OTC planning reference (all APAP sources combined)
Math ceiling only
Up to ~5 equal doses in 24 h if each dose is 270 mg
Real schedules must respect minimum hours between doses on your label (often 4–6 hours) and liver safety. Never exceed labeled maximums or your clinician's plan.
Acetaminophen overdose can cause liver injury. Alcohol use, fasting, warfarin interaction concerns, and chronic liver disease change risk. Seek emergency care for suspected overdose or overdose line per your country.
Shows a simple dose-count ceiling from a conservative 24-hour milligram total. Extended-release products have different timing rules—always follow your specific Drug Facts panel.
Uses your selected mg/kg factor, rounds, applies a per-dose cap, and compares daily totals to both weight-based teaching limits and the same conservative OTC daily ceiling.
The hardest part of safe acetaminophen use is accounting for every product. This calculator cannot scan your medicine cabinet—manual checking is essential.
500 mg per dose with a 3000 mg conservative daily ceiling → arithmetic ceiling of about 6 equal doses only if spacing and labeling allow— real-world schedules are often fewer.
For adults, the tool divides a conservative 24-hour acetaminophen total by your selected single dose to produce a theoretical maximum number of equal-sized doses. For children, it converts pounds to kilograms when needed, multiplies by your chosen mg/kg factor, rounds to whole milligrams, applies a per-dose cap, and compares daily totals to both a mg/kg/day teaching limit and the same conservative OTC daily ceiling.
weightKg = lb × 0.45359237 (or kg as entered)singleDoseMg = min(1000, round(weightKg × mg/kg))dailyMgCeiling = min(3000, round(weightKg × 75))Simplifications for teaching. Neonatal dosing, preterm rules, and hospital protocols are not modeled here.
Compare with our ibuprofen dosage calculator for a different drug class, schedule, and contraindications.
Get a Custom Calculator for Your PlatformConvert milligrams to milliliters using your bottle’s mg/mL concentration, or use the dosage device that matches that concentration.
Share it with families learning safe OTC use
Suggested hashtags: #Tylenol #Acetaminophen #Pediatrics #OTC #Calculator