Caffeine Limit by Weight Calculator
Estimate a moderate caffeine allowance based on a 3 milligram per kilogram recommendation often cited for healthy adults. Input your weight to see an approximate ceiling for total caffeine consumed in a day.
Educational guideline only—speak with a healthcare professional about safe caffeine intake for your circumstances.
Examples
- 60 kg ⇒ 180 mg daily limit
- 70 kg ⇒ 210 mg daily limit
- 90 kg ⇒ 270 mg daily limit
FAQ
Why does the calculator use 3 mg per kilogram?
Three milligrams per kilogram is a conservative benchmark from sports nutrition research for moderate intake without significant side effects.
Can I use pounds instead of kilograms?
Convert pounds to kilograms by dividing by 2.20462 before entering your weight to keep the math accurate.
Does this account for sensitivity to caffeine?
No. Genetics, tolerance, and medical history greatly influence how you respond, so adjust downward if you feel overstimulated.
Is the limit per serving or per day?
The result reflects a total daily amount. Spread intake across the day and avoid consuming the entire amount at once.
Should athletes consume more caffeine for performance?
Sports protocols sometimes use 3–6 mg/kg, but those higher doses should only be attempted under professional supervision.
Additional Information
- Many health organisations suggest keeping caffeine below 3–4 mg/kg for most adults to avoid jitteriness, elevated heart rate, and sleep disruption.
- Pregnant individuals are typically advised to stay below 200 mg per day regardless of body weight.
- Caffeine content varies widely—an 8 oz (240 ml) brewed coffee averages 95 mg, while an espresso shot has about 63 mg.
- Individuals with heart arrhythmias, anxiety disorders, or certain medications may require much lower limits—always consult a clinician.