About 200 mg per 12 oz can
A standard 12 oz can of Celsius contains roughly 200 mg of caffeine — half of an adult's 400 mg daily ceiling, and more than two cups of coffee. The "Celsius Heat" line goes higher still (~300 mg). That puts it near the top of the caffeine chart. (Per the standard can; varieties vary — read the label.)
That's a big single dose
- One can = half your day's caffeine. Plan the rest around it.
- Two cans (~400 mg) leaves you at the limit with zero room for coffee.
- It's marketed as a fitness drink — handy as a pre-workout (200 mg suits a 35–65 kg person's 3–6 mg/kg range), but it's a lot for a casual sipper.
Check whether 200 mg fits your body with the intake calculator — it shows your exercise dose too.
Celsius and your sleep
At 200 mg, a Celsius lingers. Half is still in you about 5 hours later, so a 3 pm can means ~100 mg onboard at 8 pm — plenty to delay sleep and cut its depth. If Celsius is your afternoon habit, run it through the half-life calculator and find your real cutoff time.
Put it into practice: 200 mg is a lot — see how it fits your day with the intake calculator.
Free sleep & caffeine calculators
Comparing drinks with less caffeine?
Compare the product label and serving size with the amounts in our drink reference. Decaf can still contain caffeine; check the individual product.
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