Caffeine Limits: A Weight-Based Way to Think About Them
A flat 400 mg ceiling does not fit every body size. A per-kilogram figure gives smaller adults a more sensible personal ceiling.
What is the Caffeine Limit Calculator?
This tool multiplies body weight by 6 mg per kilogram and caps the result at 400 mg, the widely quoted daily ceiling for most healthy adults. It is a general planning guide, not personal medical advice — pregnancy, health conditions, and medication can lower the right limit for you.
How to use it
- Enter your body weight in kilograms.
- Click Estimate Limit.
- Read the estimated limit and compare it with your usual daily intake.
Worked example
At 60 kg the weight-based figure is 360 mg, under the 400 mg cap, so the estimated limit is 360 mg.
Is 400 mg safe for everyone?
No. It is a general ceiling for most healthy adults, while pregnancy, some conditions, and some medicines call for a lower limit. Ask a clinician if unsure.
Frequently asked questions
How much caffeine is in a coffee?
A typical brewed mug holds roughly 90 to 100 mg, but strength varies a lot by bean, size, and brew method.
Should children use this tool?
No, this guide is framed for adults; children need far lower limits.