Caffeine Content Compared: Coffee, Tea, Energy Drinks, and Everything Else
Caffeine is the world's most consumed psychoactive substance, ingested daily by approximately 80% of the global adult population. Most regular coffee drinkers could not accurately state how much caffeine is in their morning cup, how that compares to an energy drink, or where the safe daily limit actually falls. The variability across sources is significant: a standard filter coffee from a home machine and a large Starbucks Pike Place contain similar quantities of caffeine by the cup but entirely different quantities per ounce, and comparing them to an energy drink on a per-can basis produces misleading conclusions. Caffeine content comparisons are only meaningful when the serving size, concentration, and consumption rate are all specified.
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Coffee caffeine content varies more than most people realise, depending on roast level, brewing method, grind size, water temperature, and brew time. Lighter roasts retain slightly more caffeine by weight than darker roasts (caffeine is partially broken down by heat during roasting), contrary to the popular belief that dark roasts are stronger in caffeine. The difference is approximately 5% between light and dark roast by weight, which is negligible in practice.
| Coffee Type | Serving Size | Caffeine (mg) |
|---|---|---|
| Drip/filter coffee (home brewed) | 240ml (8oz) | 95 to 165mg |
| Starbucks Pike Place (Tall/12oz) | 355ml (12oz) | 235mg |
| Starbucks Pike Place (Grande/16oz) | 473ml (16oz) | 310mg |
| Espresso (single shot) | 30ml (1oz) | 60 to 80mg |
| Espresso (double shot) | 60ml (2oz) | 120 to 160mg |
| Cappuccino / Latte (one shot) | 240ml (8oz) | 60 to 80mg |
| Cold brew coffee (concentrate) | 240ml (8oz) | 150 to 240mg |
| Instant coffee (one teaspoon) | 240ml (8oz) | 60 to 90mg |
| Decaffeinated coffee | 240ml (8oz) | 2 to 15mg |
Tea Caffeine Content
Tea caffeine content varies with brewing time more than any other variable. Steeping black tea for 1 minute versus 5 minutes roughly doubles the caffeine extracted. Temperature matters too: cold-brewed tea extracts significantly less caffeine than hot-brewed tea of the same variety.
| Tea Type | Serving Size | Caffeine (mg) |
|---|---|---|
| Black tea (brewed 3 to 4 min) | 240ml (8oz) | 47 to 70mg |
| Matcha (1 tsp powder) | 240ml (8oz) | 70 to 80mg |
| Green tea (brewed 2 to 3 min) | 240ml (8oz) | 20 to 45mg |
| Oolong tea | 240ml (8oz) | 30 to 50mg |
| White tea | 240ml (8oz) | 15 to 30mg |
| Herbal tea (chamomile, peppermint, etc.) | 240ml (8oz) | 0mg |
| Starbucks Chai Latte (Grande) | 473ml (16oz) | 95mg |
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| Drink | Serving Size | Caffeine (mg) |
|---|---|---|
| Red Bull (standard) | 250ml (8.4oz) | 80mg |
| Monster Energy (standard) | 473ml (16oz) | 160mg |
| Rockstar Energy (original) | 473ml (16oz) | 160mg |
| Celsius Energy Drink | 355ml (12oz) | 200mg |
| Ghost Energy | 473ml (16oz) | 200mg |
| Coca-Cola Classic | 330ml (12oz) | 34mg |
| Pepsi | 330ml (12oz) | 38mg |
| Diet Coke / Coke Zero | 330ml (12oz) | 46mg |
Other Caffeine Sources
- Dark chocolate (70% to 85%): approximately 20 to 30mg per 30g serving
- Milk chocolate: approximately 5 to 10mg per 30g serving
- Pre-workout supplements: 150 to 300mg per serving (some extreme products reach 400mg)
- Caffeine tablets (standard): 100 to 200mg per tablet (NoDoz, Proplus)
- Coffee ice cream (per 100g): approximately 25 to 50mg
Safe Daily Limits
The European Food Safety Authority (EFSA) and the US FDA both conclude that up to 400mg of caffeine per day is safe for healthy adults without adverse effects on health. This equates to approximately four standard cups of home-brewed filter coffee, or two large Starbucks coffees, or five standard Red Bulls. The 400mg figure applies to spread consumption throughout the day; a single 400mg dose produces more pronounced effects than the same amount consumed over 8 to 10 hours. Individual sensitivity varies significantly: CYP1A2 genetic polymorphisms mean some people metabolise caffeine two to four times faster than others, explaining why identical doses affect people so differently.
For specific populations, lower limits apply: pregnant women (200mg/day, as discussed in the WHO and NHS guidelines), adolescents under 18 (1.4mg/kg body weight per day), and people with anxiety disorders, cardiac arrhythmia, or sleep disorders (individual assessment with a healthcare provider is appropriate).
Related: Coffee and Pregnancy: How Much Caffeine Is Safe? | Coffee vs Tea: Which Is Better for Your Health?