Interactive Calculator
How Much Caffeine Is in Your Cup?
Estimate your caffeine intake by brew method, track it against daily limits, and see how long it lingers in your system.
Standard automatic drip machine, medium roast.
General FDA guidance suggests up to 400mg/day is safe for most healthy adults. Pregnant individuals and those sensitive to caffeine should consult a doctor for personal limits (often 200mg or less).
Clearing Your System
Caffeine has an average half-life of ~5 hours. At this dose, it would take roughly 10 hours to fall below a "low residual" level (~25mg) — useful context for timing your last cup before bed.
Quick Reference
Caffeine by Brew Method (per 240ml / 8oz)
| Method | Caffeine (8oz) | Relative Strength |
|---|---|---|
| ☕ Espresso (single shot) | 504mg | |
| 🫗 Drip Coffee | 95mg | |
| 💧 Pour Over | 100mg | |
| 🫖 French Press | 107mg | |
| 🧊 Cold Brew Concentrate | 155mg | |
| 🥄 Instant Coffee | 62mg | |
| 🌙 Decaf | 3mg |
Values are population averages and vary significantly by bean origin, roast level, brew strength, and serving size. This tool is for general informational purposes only and is not medical advice.