CortexLit

CortexLit tool · Caffeine · Runs offline · No account

Daily Caffeine Totaller

Add up every caffeine source in a day, including energy drinks and shots, and show where you sit against a 400 mg ceiling.

← Back to the article · See the evidence

This tool gives general information based on the research summarised in Energy Drinks: What the Evidence Says About the Load You Are Taking. It is not a medical device, does not diagnose, and does not replace advice from your clinician.

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Free (this page)
  • full day total across five sources
  • position against the 400 mg reference point
  • text export and print
  • all citations and cautions


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  • calendar (.ics) cut-off reminders
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Commercial disclosure: optional paid Plus tier; all evidence, cautions and the main result are free. No affiliate links, no sponsors.







What this is based on


Every output names at least one verified PubMed source. Identifiers were verified on 2026-10-11 in an earlier batch and carried over into this build; they were not re-queried here, and no retraction database was checked. Verification was at abstract level.


Wikoff 2017
Wikoff D, Welsh BT, Henderson R, et al. Systematic review of the potential adverse effects of caffeine consumption in healthy adults, pregnant women, adolescents, and children. Food Chem Toxicol. 2017;109(Pt 1):585-648. doi:10.1016/j.fct.2017.04.002. PMID: 28438661.
PMID 28438661 · systematic review · weight 1.0 · abstract level
da 2022
da Costa BRB, El Haddad LP, De Martinis BS. Caffeine content of energy drinks marketed in Brazil. Drug Test Anal. 2022;14(9):1660-1664. doi:10.1002/dta.3323. PMID: 35595544.
PMID 35595544 · observational study · weight 0.5 · abstract level
Nadeem 2021
Nadeem IM, Shanmugaraj A, Sakha S, et al. Energy Drinks and Their Adverse Health Effects: A Systematic Review and Meta-analysis. Sports Health. 2021;13(3):265-277. doi:10.1177/1941738120949181. PMID: 33211984.
PMID 33211984 · systematic review meta analysis · weight 1.0 · abstract level


Limits: Cup sizes and brews vary widely; the 95 mg and 40 mg figures are rough averages, not measurements of your drink. The 400 mg reference point applies to healthy adults and not to pregnancy, under-18s or sensitive groups.







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