Coffee tool
Calculate your caffeine before the jitters do.
Pick a drink, choose the size, enter how many you’ve had today, and compare your total against a daily limit. Results update instantly and use typical caffeine ranges, not medical advice.
1. Choose your drink
Use the closest match. Caffeine varies by bean, recipe, brand, brew time, and serving size.
Choose the closest cup size for per-ounce drinks.
Decimals work: 1.5 servings, 2.5 cups, etc.
How common drinks compare
Shown as estimated caffeine for the selected size, except espresso-based drinks are estimated by shot count.
Why numbers vary
Two “12 oz coffees” can differ a lot. Bean type, dose, grind, brew ratio, steep time, and cafe recipe all affect caffeine.
Watch your timing
Caffeine can stay active for hours. If sleep is suffering, try moving your last caffeinated drink earlier in the day.
Decaf is not zero
Most decaf coffee still contains a small amount of caffeine, usually much less than regular coffee.