Caffeine Limit Calculator
Find your personal safe caffeine limit from your body weight, then tap your drinks as you have them — the tracker warns you before you cross the line.
Your safe daily limit
or about 6 mg per kg, whichever is lower
Add a drink
Today intake
- No drinks logged yet today.
How to use
- Enter your body weight and pick kg or lb — your safe daily limit updates instantly.
- Tap a drink each time you have one, or add a custom mg value.
- Watch the running total and percent of your limit; you get a warning at 80% and a strong warning over 100%.
- The log saves in your browser for today only — tomorrow starts at zero.
Note: caffeine in real drinks varies by brand, size and brew. The mg values here are common averages. This is general information, not medical advice.
Frequently Asked Questions (FAQ)
What is the safe daily caffeine limit?
EFSA considers up to 400 mg of caffeine per day safe for most healthy adults. A common weight-based guideline is about 6 mg per kg of body weight per day. This tool uses whichever of the two is lower.
How is my personal limit worked out?
From your body weight using about 6 mg per kg per day, capped at the 400 mg EFSA guide, whichever is lower.
How much caffeine is in coffee, tea and soda?
Typical values: espresso about 63 mg per shot, brewed coffee about 95 mg per cup, black tea about 47 mg, green tea about 28 mg, cola about 34 mg per can, and energy drinks about 80 mg per can.
Which drinks can I log?
Espresso, brewed coffee, black tea, green tea, cola, and energy drinks with common-average mg values, plus any custom drink you add yourself.
Where is my caffeine log saved?
Your log is saved in your own browser with local storage for the current day only. It starts fresh each new day and never leaves your device.