Caffeine Limit Calculator
Estimate a sensible daily caffeine ceiling from your body weight.
Quick answer: enter your details below and click Estimate Limit — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter your body weight in kilograms.
- Click Estimate Limit.
- Read the estimated limit and compare it with your usual daily intake.
About this tool
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.
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.