What is the Caffeine Calculator?
Tea, coffee, energy drinks, cola and chocolate all contain caffeine. Add what you drink in a day to see your total caffeine and compare it with the commonly quoted limit of about 400 mg a day for healthy adults (about 200 mg in pregnancy). The tool also estimates how much caffeine may still be in your body at bedtime, since caffeine has a half-life of roughly 5 hours.
How to use the Caffeine Calculator
- Enter how many cups/cans of each drink you had.
- Enter the time of your last drink and your bedtime.
- Read your total and bedtime estimate.
Typical caffeine amounts
- Brewed coffee (240 ml): ~95 mg
- Espresso shot: ~63 mg
- Tea / chai cup: ~40–50 mg
- Green tea: ~28 mg
- Energy drink (250 ml): ~80 mg
- Cola can (330 ml): ~34 mg
- Dark chocolate (50 g): ~40 mg
Note
Sensitivity to caffeine varies. Ask your doctor about limits if you are pregnant, have heart problems or take medicines.
This Caffeine Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech