Bang vs Reign: caffeine compared
Bang and Reign carry the same caffeine per serving: 300 mg each. Per fluid ounce they are about the same: 18.8 mg/oz versus 18.8 mg/oz.
| Bang | Reign | |
|---|---|---|
| Serving | 16 oz | 16 oz |
| Caffeine per serving | 300 mg | 300 mg |
| Per fl oz | 18.8 mg | 18.8 mg |
| Share of 400 mg/day | 75% | 75% |
| Servings to reach 400 mg | 1.3 | 1.3 |
| Hours until under 50 mg | 12.9 h | 12.9 h |
| Last one for an 11 PM bedtime · standard (50 mg) | 10:05 AM | 10:05 AM |
| Last one for an 11 PM bedtime · sensitive (25 mg) | 5:05 AM | 5:05 AM |
| Share of the 200 mg pregnancy limit | 150% | 150% |
One serving of each, over 16 hours
Common questions
Which has more caffeine, Bang or Reign?
Neither: both have about 300 mg per serving.
Which is stronger per ounce, Bang or Reign?
About the same: 18.8 mg per fl oz for Bang and 18.8 mg for Reign. The difference per can or cup comes from serving size.
When should I stop drinking Bang or Reign before bed?
For an 11 PM bedtime with a 50 mg limit and a 5-hour half-life: last Bang by 10:05 AM, last Reign by 10:05 AM. 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 — Bang: CSPI caffeine chart (Bang, 16 oz), checked 2026-10-13.
Source — Reign: Monster Energy press release — REIGN Total Body Fuel (300 mg), checked 2026-10-13.