The highest-caffeine energy drinks you can buy in the US are 16 oz cans listed at 300 mg each, such as Bang and Celsius Heat. Most other big-name cans sit between 80 and 200 mg.
Can size matters as much as the number on the label, so this guide also shows caffeine per fluid ounce and how many of each fit inside the FDA's 400 mg daily figure for healthy adults.
We refreshed it in November 2026: we removed drinks we could not source, added the per-ounce comparison and updated the G FUEL numbers.
- Highest listed
- 300 mg per 16 oz can
- Red Bull (8.4 oz)
- 80 mg
- FDA daily figure
- 400 mg (healthy adults)
- G FUEL tub
- 140 mg per serving
Which Energy Drink Has the Most Caffeine?
Bang and Celsius Heat are listed at 300 mg of caffeine per 16 oz can in the US, which makes them the highest-caffeine mainstream cans we could confirm. Celsius says its Heat can has 300 mg of caffeine, and the Bang US site lists the same figure for its whole line.
Concentrated shots and pre-workouts can go higher in a single serving, but they are a different product type and not what most people mean by an energy drink.
Energy Drink Caffeine Chart
This table lists the figures we could confirm from the brand or from two sources that agree. Per-ounce is our own math: caffeine divided by can size.
| Drink | Can size | Caffeine | Per fl oz |
|---|---|---|---|
| Bang Energy (US) | 16 oz | 300 mg | 18.8 mg |
| Celsius Heat | 16 oz | 300 mg | 18.8 mg |
| Celsius Essentials | 12 oz | 270 mg | 22.5 mg |
| Celsius (original line) | 12 oz | 200 mg | 16.7 mg |
| Monster Energy Original | 16 oz | about 160 mg | about 10 mg |
| Red Bull | 8.4 oz | 80 mg | 9.5 mg |
| G FUEL Energy tub | 1 serving (you set the volume) | 140 mg | varies with water |
Celsius Heat may be discontinued in some stores, and Celsius lists its Essentials line at 270 mg per can, so the highest per-ounce number actually belongs to a 12 oz can.
Why Per Ounce Matters More Than Per Can
A small can can look weak next to a big one and still be strong for its size. Per fluid ounce, Celsius Essentials is the strongest on our list, ahead of Bang and Celsius Heat.
- If you sip slowly, the can total is what you take in.
- If you chug, the per-ounce number is how hard it hits.
- Comparing a 8.4 oz can to a 16 oz can by total mg alone hides all of this.
How Much Caffeine Is Too Much? What the FDA Says
The FDA says 400 mg a day is an amount not generally associated with negative effects for most healthy adults. That is guidance for adults, not for kids, teens or pregnancy, where limits are lower, so ask a doctor if you are unsure.
| Pattern | Total for the day | Room left under 400 mg |
|---|---|---|
| One 300 mg can | 300 mg | 100 mg |
| Two Red Bull 8.4 oz cans | 160 mg | 240 mg |
| One Celsius Essentials can | 270 mg | 130 mg |
| Two G FUEL Energy servings | 280 mg | 120 mg |
Pure and highly concentrated caffeine powders are a separate danger: the FDA says around 1,200 mg, less than half a teaspoon of pure caffeine, can cause toxic effects including seizures. Flavored drink mixes sold in measured servings are not that, but never eyeball pure caffeine.
For timing, see our guide on when to stop energy drinks before bed, and for the full safety picture read how much caffeine is too much.
How Much Caffeine Is in G FUEL?
G FUEL Energy Formula tubs have 140 mg of caffeine per serving, zero sugar and 40 servings per tub. G FUEL Supreme Hydration has zero caffeine and 30 servings per tub.
G FUEL cans are 140 mg or 300 mg depending on the line, so read the can. Because the tubs are a powder, you decide how much you mix: one serving is 140 mg, two is 280 mg. See our mixing guide for ratios.
If you want to skip caffeine entirely, our caffeine-free energy drinks post covers the options.
Pick Your Caffeine Level
If you would rather control your caffeine than guess at a can, a measured scoop makes the math easy.
G FUEL Energy Formula is zero sugar, 140 mg of caffeine per serving and 40 servings per tub. G FUEL Supreme Hydration brings electrolytes with zero caffeine.
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FAQs
Which energy drink has the most caffeine?
Bang and Celsius Heat are listed at 300 mg per 16 oz can, the highest among mainstream cans we could confirm. Check the label, since formulas differ by country.
What energy drink has 400 mg of caffeine?
We could not confirm any mainstream US can at 400 mg. Higher numbers show up in shots and pre-workouts, which are different products.
How much caffeine is too much in a day?
The FDA says 400 mg a day is an amount not generally associated with negative effects for most healthy adults. Limits are lower for kids and during pregnancy.
How much caffeine does Red Bull have?
Red Bull lists 80 mg of caffeine in an 8.4 fl oz can.
How much caffeine is in G FUEL?
G FUEL Energy Formula tubs have 140 mg per serving. G FUEL cans are 140 mg or 300 mg depending on the line, and Supreme Hydration has none.