Coffee, brewed vs 5-hour Energy: caffeine compared
5-hour Energy (1.9 oz) has 200 mg of caffeine, 105 mg more than Coffee, brewed (8 oz, 95 mg) — 2.1× as much per serving. Per fluid ounce, 5-hour Energy is the stronger drink: 105 mg/oz versus 11.9 mg/oz.
| Coffee, brewed | 5-hour Energy | |
|---|---|---|
| Serving | 8 oz | 1.9 oz |
| Caffeine per serving | 95 mg | 200 mg |
| Per fl oz | 11.9 mg | 105 mg |
| Share of 400 mg/day | 24% | 50% |
| Servings to reach 400 mg | 4.2 | 2.0 |
| Hours until under 50 mg | 4.6 h | 10.0 h |
| Last one for an 11 PM bedtime · standard (50 mg) | 6:22 PM | 1:00 PM |
| Last one for an 11 PM bedtime · sensitive (25 mg) | 1:22 PM | 8:00 AM |
| Share of the 200 mg pregnancy limit | 48% | 100% |
One serving of each, over 16 hours
Common questions
Which has more caffeine, Coffee, brewed or 5-hour Energy?
5-hour Energy (1.9 oz) has about 200 mg versus 95 mg in Coffee, brewed (8 oz): 105 mg more, or 2.1× as much.
Which is stronger per ounce, Coffee, brewed or 5-hour Energy?
5-hour Energy: about 105 mg per fl oz versus 11.9 mg for Coffee, brewed. Serving size decides the total you actually drink.
How many Coffee, brewed servings equal one 5-hour Energy?
About 2.1 servings of Coffee, brewed (8 oz) match the caffeine in one 5-hour Energy (1.9 oz).
When should I stop drinking Coffee, brewed or 5-hour Energy before bed?
For an 11 PM bedtime with a 50 mg limit and a 5-hour half-life: last Coffee, brewed by 6:22 PM, last 5-hour Energy by 1:00 PM. Half-life varies from about 1.5 to 9.5 hours between people.
Method
Caffeine per labeled serving, from the same drink table every calculator here uses (FDA/USDA reference amounts and manufacturer labels; see caffeine content of every drink). Brewed drinks vary batch to batch, so read these as typical values. Decay uses a 5-hour average half-life with a 45-minute absorption ramp; cutoff = bedtime − 5 h × log₂(dose ÷ limit). Percentages use the FDA's 400 mg/day figure for healthy adults and the 200 mg/day limit ACOG gives for pregnancy.
Source — Coffee, brewed: USDA FoodData Central (SR Legacy 171890), checked 2026-10-13. 40 mg per 100 g × 237 g (8 fl oz).
Source — 5-hour Energy: CSPI caffeine chart (5-hour Energy Regular Strength, 1.9 oz), checked 2026-10-13.