Coffee Caffeine Content Calculator
Total daily caffeine across every drink you have.
Enter your values
Enter the brewed coffee cups you are working with.
Enter the espresso shots you are working with.
Enter the cups of tea you are working with.
Enter the energy drinks you are working with.
Enter the body weight in kg.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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
At a glance
| What it does | Total daily caffeine across every drink you have. |
|---|---|
| Category | Health |
| Inputs needed | Brewed coffee cups, Espresso shots, Cups of tea, Energy drinks, Body weight |
| Main output | Total caffeine |
| Formula | total mg = sum of servings x mg per serving |
| Cost | Free — no sign-up, no download |
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.
Inputs explained
- Brewed coffee cups
- Enter the brewed coffee cups you are working with.
- Espresso shots
- Enter the espresso shots you are working with.
- Cups of tea
- Enter the cups of tea you are working with.
- Energy drinks
- Enter the energy drinks you are working with.
- Body weight(kg)
- Enter the body weight in kg.
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.
What do I need to enter into the Coffee Caffeine Content Calculator?
Just 5 values: brewed coffee cups, espresso shots, cups of tea, energy drinks, body weight. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Coffee Caffeine Content Calculator work out the answer?
Most adults can safely have up to 400 mg of caffeine a day — roughly four cups of brewed coffee. It applies the formula total mg = sum of servings x mg per serving and shows the working so you can check each step by hand.
Is the Coffee Caffeine Content Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.