Caffeine Calculator
Know your buzz. Estimate intake from coffee, tea, and energy drinks.
1
Total Caffeine
0mg
Low intake. Likely no side effects.
based on average density values. actual content varies by brand and brew strength.
About Caffeine Content
Typical Amounts
- Espresso: ~64mg per shot (1oz).
- Drip Coffee: ~95mg per cup (8oz).
- Energy Drinks: ~80-160mg per can.
- Black Tea: ~47mg per cup.
Safe Limits
Up to 400 mg (about 4 cups of brewed coffee) a day appears to be safe for most healthy adults. Pregnant women are often advised to limit their intake to 200 mg.
Overdose Symptoms
Consuming too much caffeine can lead to headaches, insomnia, nervousness, irritability, frequent urination, stomach upset, and fast heartbeat/tremors.
FAQ
What is the daily recommended limit?
The FDA cites 400 milligrams a day—that's about four or five cups of coffee—as an amount not generally associated with dangerous, negative effects for healthy adults.
Which coffee has the most caffeine?
Light roast actually has slightly more caffeine than dark roast by volume, as the roasting process burns some off. However, Devil Mountain's 'Black Label' claims over 1500mg per serving!
Half-life of caffeine?
The mean half-life of caffeine in plasma of healthy individuals is about 5 hours. If you drink 200mg at 12pm, you still have 100mg in your system at 5pm.
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