Acetaminophen 24-Hour Total & Ceiling
Acetaminophen 24-hour ceiling check: sums up to three source products and compares the total against the selected daily ceiling, or for a child 2 to under 12 counts the doses against the monograph limit of 5 in 24 hours.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Source 1 dose
- 650 mg
- Source 1 doses/day
- 4
- Source 2 dose
- 325 mg
- Source 2 doses/day
- 4
- Source 3 dose
- 0 mg
- Source 3 doses/day
- 0
- Daily ceiling
- 4000 mg (the amount in the label liver warning)
Result: 24-hour total 3900 mg; 100 mg below the 4000 mg ceiling (97.5%).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Source 1 dose
- Source 1 doses/day
- Source 2 dose
- Source 2 doses/day
- Source 3 dose
- Source 3 doses/day
- Daily ceiling (mg, or child: 5 doses)
How this is calculated
Citation
US FDA Organ-Specific Warnings: Acetaminophen (OTC labeling) and the 325 mg/dose-unit prescription-combination limit; manufacturer labeling (max 4 g/24 h; lower in hepatic impairment / chronic alcohol use). Child 2 to under 12: not over 5 doses in 24 h (OTC Monograph M013.50(d)(2)).
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.