Coffee Caffeine Content Calculator
Total daily caffeine across every drink you have.
Enter your values
ⓘ Live results
Results
- Total caffeine
- 347 mg/day
- Percent of 400 mg limit
- 87%
- Per kg body weight
- 5 mg/kg
- Half-life clearance
- ~25 hours to clear most of it
Quick answer
Most adults can safely have up to 400 mg of caffeine a day — roughly four cups of brewed coffee.
total mg = sum of servings x mg per serving
How to use the Coffee Caffeine Content Calculator
- 1Count each type of caffeinated drink in a typical day.
- 2Add energy drinks and pre-workout separately if you use them.
- 3Stop caffeine at least eight hours before bed.
Worked example
Using the values the calculator loads with:
Inputs
- Brewed coffee cups2
- Espresso shots1
- Cups of tea2
- Energy drinks0
- Body weight70 kg
Results
- Total caffeine347 mg/day
- Percent of 400 mg limit87%
- Per kg body weight5 mg/kg
- Half-life clearance~25 hours to clear most of it
Frequently asked questions
Is 400 mg safe for everyone?
Pregnancy guidance is 200 mg, and sensitive people react well below 400 mg.
Does decaf count?
Decaf has 2-5 mg per cup — negligible for most people.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.