Prime Energy vs Celsius vs Monster: which has more caffeine?

Prime Energy has the most caffeine of the three: 200mg per 12 oz can, against 200mg per 12 oz can for Celsius and 160mg per 16 oz can for Monster. It also leads per ounce, at roughly 16.7mg to 10mg, so the order holds whichever way you count.

Prime Energy vs Celsius vs Monster: the numbers

Sources: Prime Energy is 200mg per 12 oz can per Caffeine Informer (source), and the figure is carried in our Prime Energy guide; Celsius is 200mg per 12 oz can per Caffeine Informer (source), and the figure is carried in our Celsius guide; Monster is 160mg per 16 oz can per Caffeine Informer (source), and the figure is carried in our Monster guide.

Per can or per ounce: pick the number that matches how you drink

The serving sizes here are different, so the two rankings answer different questions. Per serving tells you what one purchase delivers. Per fluid ounce tells you how concentrated each sip is, which is what matters if you nurse a large one slowly or split a can. Prime Energy is the densest of the three at about 16.7mg per ounce; Monster is the lightest at 10mg.

The three head-to-head pages

Each pairing has its own page with the full math:

• Prime Energy vs Celsius, head to head
• Prime Energy vs Monster, head to head
• Celsius vs Monster, head to head

Which one should you pick?

Take Monster when you want the smallest dose of the three, Celsius when you want a middle number without thinking about it, and Prime Energy when you actually want the 200mg and know how you handle it. If you drink more than one caffeinated thing a day, the useful move is adding the day up against the 400mg reference rather than judging each drink alone.

For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.

Related reading

• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Which has the most caffeine, Prime Energy, Celsius or Monster? Prime Energy, at 200mg per 12 oz can. Celsius has 200mg per 12 oz can and Monster has 160mg per 16 oz can.

Which of the three is strongest per ounce? Prime Energy, at about 16.7mg per fluid ounce, ahead of Celsius at 16.7mg and Monster at 10mg.

How many Prime Energy servings reach the FDA 400mg reference? About 2.0 of them, at 12 oz can each. The FDA cites 400mg a day as an amount generally not associated with negative effects in healthy adults. This is information, not advice.