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Caffeine safe dose calculator

A sensible single dose and daily ceiling for caffeine, scaled to your body weight.

210 mg per dose
A performance dose is roughly 3 mg per kg of body weight — about the caffeine in two cups of coffee for most people.
Daily ceiling400 mg
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Educational only. The per-kilogram performance dose is the same for men and women — caffeine scales with body size, not sex. Pregnancy is the one common case with a lower ceiling: health authorities in the US, UK and EU put it at about 200 mg a day. Heart conditions and some medications lower it further — check with a clinician.