How much caffeine is in a CELSIUS?
200 mg in a 12 oz can, by the label on a can photographed in November 2025. That’s about two 8 oz coffees, or six cans of Coke. One at 4pm still leaves about 84 mg in you at an 11pm bedtime, close to a whole 8 oz coffee.
The can says “Live Fit”, it has 10 calories and it comes in fruit flavors, so a CELSIUS looks like the light option in the fridge. It has more caffeine than a 16 oz Monster (160 mg) in a smaller can. By the ounce it’s about 17 mg, against about 12 for brewed coffee and under 10 for Red Bull.
We’d call it a morning drink. For an 11pm bedtime, have it by about 10:40am to fall asleep under 40 mg, the lower of our two bedtime lines, or by about 3:40pm to stay under 80 mg, the higher one.
Why a 4pm can reaches your bed
Each time you double a dose, it takes one more half-life to fall to the same level, about 5 hours on average. A 200 mg can at 4pm leaves about the same at 11pm as a 100 mg coffee at 9pm would, about 84 mg. That’s about what a 400 mg dose 12 hours before bed leaves, and in a 2025 trial that dose still cut about 21 minutes of deep sleep.
| When you drink it | Left at 11pm |
|---|---|
| 9am | about 32 mg |
| Noon | about 48 mg |
| 3pm | about 73 mg |
| 4pm | about 84 mg |
These use the average half-life of 5 hours. On a half-life of 3 hours, the 4pm can leaves about 47 mg, and on 6 hours about 97 mg.
CELSIUS against the others
| Drink | Caffeine | Per ounce |
|---|---|---|
| CELSIUS, 12 oz | 200 mg | about 17 mg |
| Monster, 16 oz | 160 mg | 10 mg |
| Red Bull, 8.4 oz | 80 mg | about 9.5 mg |
| Brewed coffee, 8 oz | 95 mg | about 12 mg |
| Coca-Cola, 12 oz | 34 mg | about 3 mg |
Some CELSIUS cans list other amounts, so check the label on yours. The company’s own FAQ lists caffeine among the ingredients and says “CELSIUS is not recommended for people sensitive to caffeine.”
Who should skip it
One can is twice the most pediatricians suggest for a teenager in a whole day (100 mg), and they advise against energy drinks for all children and teens. In pregnancy, one can is the whole day’s line of under 200 mg, by ACOG’s guidance (caffeine in pregnancy).
Try your can
Put your CELSIUS into the cutoff clock below at the time you usually have it, and tap the smaller drink to see how many hours a small Red Bull or a tea buys you.
If the CELSIUS is your afternoon pick-me-up, how to have more energy without caffeine has what to try first. In one small study, 10 minutes of easy stair walking made tired students feel more energetic than 50 mg of caffeine.
200 mg
CELSIUS, 12 oz can. Can label, 200 mg. Some lines differ, so check a current can. One at 3pm still leaves about 73 mg at an 11pm bedtime.
When should I stop?
When you fall asleep at 11:00pm
83 mgA measured cost
You'll fall asleep with about a cup of coffee in you.
- Brewed coffee, 8 oz95 mg
Brewed coffee, 16 oz190 mg
Your last drink, a 16 oz coffee at 3:00pm
- Under 40 mg at sleep
- by 8:10am
- Under 80 mg
- by 2:45pm
The full clock, with the band, 3am and the table by drink.
11 sources
- CELSIUS Sparkling Fantasy Vibe, 12 fl oz can, label photographed November 2025 (caffeine content 200 mg), Open Food Facts 0889392000597, checked 2026-11-14world.openfoodfacts.org
- CELSIUS, FAQ, checked 2026-11-14celsius.com
- USDA FoodData Central, SR Legacy: brewed coffee (171890), espresso (171891), brewed black tea (173227) and brewed green tea (171917)fdc.nal.usda.gov
- The Coca-Cola Company, What is caffeine?coca-colacompany.com
- Monster Energy, 16 fl oz can, label photographed November 2025 (caffeine from all sources 160 mg per can), Open Food Facts 0070847811169, checked 2026-11-14world.openfoodfacts.org
- Red Bull, How much caffeine is in a can of Red Bull? checked 2026-11-14redbull.com
- American Academy of Child and Adolescent Psychiatry, Facts for Families No. 131: Caffeine and Children, April 2026aacap.org
- American College of Obstetricians and Gynecologists, Committee Opinion No. 462: Moderate Caffeine Consumption During Pregnancy, August 2010, reaffirmed 2026acog.org
- Gardiner C and others, Dose and timing effects of caffeine on subsequent sleep: a randomized clinical crossover trial, Sleep, 2025doi.org
- Antonio J and others, Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition, 2024doi.org
- Randolph DD, O'Connor PJ, Stair walking is more energizing than low dose caffeine in sleep deprived young women, Physiology and Behavior, 2017doi.org
