Select your drink type and enter the number of servings into the calculator below to estimate your total caffeine consumption. Serving sizes vary by beverage (for example, espresso and energy shots are typically 1 oz servings). This calculator uses a single assumed caffeine value per serving based on the ranges shown in the tables below.
Safety note: Many health authorities advise most healthy adults to limit caffeine to about 400 mg/day. Some people (including those who are pregnant, adolescents/children, people with certain heart conditions/anxiety, or those taking certain medications) may need a lower limit. For official guidance, check a trusted public health source (for example FDA or your national health authority) or ask a clinician.
Caffeine Formula
Instead of using a single universal caffeine formula, this calculator references an estimate of caffeine per serving for the selected beverage and multiplies it by the number of servings consumed. The estimated “mg per serving” values are chosen as a single assumption within the typical ranges shown in the tables below, and real-world caffeine content can vary by brand, preparation method, and serving size.
Reducing your caffeine intake may improve sleep and help some people feel less jittery or anxious. If you feel dependent on caffeine or notice withdrawal symptoms when cutting back, consider tapering gradually and discussing concerns with a clinician.
Caffeine Content by Drink
| Coffee drinks | Size in oz. (mL) | Caffeine (mg) |
|---|---|---|
| Brewed | 8 (237) | 95-165 |
| Brewed, decaf | 8 (237) | 2-5 |
| Espresso | 1 (30) | 47-64 |
| Espresso, decaf | 1 (30) | 0 |
| Instant | 8 (237) | 63 |
| Instant, decaf | 8 (237) | 2 |
| Latte or mocha | 8 (237) | 63-126 |
| Teas | Size in oz. (mL) | Caffeine (mg) |
|---|---|---|
| Brewed black | 8 (237) | 25-48 |
| Brewed black, decaf | 8 (237) | 2-5 |
| Brewed green | 8 (237) | 25-29 |
| Ready-to-drink, bottled | 8 (237) | 5-40 |
| Sodas | Size in oz. (mL) | Caffeine (mg) |
|---|---|---|
| Citrus (most brands) | 8 (237) | 0 |
| Cola | 8 (237) | 24-46 |
| Root beer (most brands) | 8 (237) | 0 |
| Energy drinks | Size in oz. (mL) | Caffeine (mg) |
|---|---|---|
| Energy drink | 8 (237) | 27-164 |
| Energy shot | 1 (30) | 40-100 |
