How much caffeine is in Caffeine pill (100 mg)?
of caffeine
Source: public manufacturer data and USDA FoodData Central. Values are estimates, not exact or medical measurements.
- 100 mg of caffeine per serving.
- About 1 cup of brewed coffee, and 25% of the FDA's 400 mg daily limit for healthy adults.
- After 6 hours roughly 48 mg is still in your system; after 12 hours about 23 mg.
- To stay under the 100 mg many people notice at bedtime, finish it about 0 h before sleep.
Caffeine pill (100 mg) delivers about 100 mg of caffeine per serving, the equivalent of roughly 1 cup of brewed coffee (a 240 ml cup is about 96 mg). That is about 4 mg more caffeine than a standard cup of coffee.
How long Caffeine pill (100 mg) stays in your system
Caffeine leaves the body through first-order elimination with a population-average half-life of about 5.7 hours. Starting from 100 mg, roughly 69 mg is left after 3 hours, about 48 mg after 6 hours, and around 23 mg after 12 hours. Your personal rate varies — smoking speeds it up, pregnancy and some medications slow it down — which is why the calculator below lets you set your own half-life and bedtime.
Caffeine pill (100 mg) and your daily limit
For most healthy adults the FDA points to about 400 mg of caffeine a day as an amount not generally linked to negative effects. One serving of Caffeine pill (100 mg) is 25% of that ceiling. Pregnant people are usually advised to stay under about 200 mg a day, and the American Academy of Pediatrics discourages caffeine for children and adolescents. This is general guidance, not medical advice. The easiest way to stay under your own limit is to log every drink — CoffeeLog adds up your real daily total automatically.
How long it stays in your system
Starting from one serving, here is roughly how much caffeine is left as the hours pass (population-average half-life of 5.7 hours).
| Time | Caffeine left | % left |
|---|---|---|
| At serving | 100 mg | 100% |
| After 1 h | 89 mg | 89% |
| After 3 h | 69 mg | 69% |
| After 6 h | 48 mg | 48% |
| After 9 h | 33 mg | 33% |
| After 12 h | 23 mg | 23% |
Your personal caffeine curve
Estimates for general information, not medical advice.
How it compares
| Drink | Serving | Caffeine |
|---|---|---|
| Caffeine pill (100 mg) | — | 100 mg |
| Pre-workout (1 scoop) | 300 ml | 200 mg |
| Caffeine pill (200 mg) | — | 200 mg |
| C4 Original (1 scoop) | 300 ml | 150 mg |
| Caffeine gum (1 piece) | — | 40 mg |
Frequently asked questions
How much caffeine is in Caffeine pill (100 mg)?
Caffeine pill (100 mg) contains about 100 mg of caffeine per serving. Values are public-source estimates, not exact measurements.
Is 100 mg of caffeine a lot?
It is about 1 cup of brewed coffee. The FDA considers up to 400 mg per day safe for most healthy adults, so this is a moderate single dose.
How long does the caffeine in Caffeine pill (100 mg) stay in your system?
Caffeine has a half-life of about 5.7 hours, so roughly 69 mg of the original 100 mg remains after 3 hours and about 23 mg after 12 hours. The calculator above shows your personal curve.
Will Caffeine pill (100 mg) keep you awake?
It can if you have it late. From 100 mg it takes roughly 0 hours to fall below the 100 mg level many people notice at bedtime. Finish it well before sleep, or use the cutoff above.
Track this automatically with CoffeeLog
Log any drink in one tap, watch caffeine fade in real time on your home screen, and get a nudge before it touches your sleep — the same engine that powers this page.
Related
TrackCaffeine provides general reference information about caffeine. It is not medical advice. Caffeine values are public-source estimates, not exact measurements.