Source-backed comparison

Compare Caffeine by Drink, Brand and Serving Size

Compare two drink from our database records by serving, market, caffeine amount, concentration and calculated half-life timeline.

First drinkFirst servingSecond drinkSecond serving

Measure	Red Bull Energy Drink	Brewed coffee
Named serving	250 ml can	8 fl oz / 237 ml
Market	UK	General reference
Caffeine per serving	80 mg	95 mg
Caffeine per 100 ml	32.0 mg	40.1 mg
Total sugars per named serving	Not documented for this serving	Not documented for this serving
Energy per named serving	Not documented for this serving	Not documented for this serving
Value basis	Manufacturer listed	Authoritative reference
Estimated after 5 hours	40 mg	47.5 mg
Absolute difference	15 mg	15 mg
Difference vs lower serving	18.8%	18.8%

Choose any two records. The selected default serving is used; open each detail page to inspect every documented size.

Calculated five-hour timeline

This table applies the same exponential half-life equation to both starting amounts. It doesn’t show measured blood levels or predict which drink will affect a particular person more.

Hours after serving	Red Bull Energy Drink	Brewed coffee
0	80 mg	95 mg
3	52.8 mg	62.7 mg
5	40 mg	47.5 mg
8	26.4 mg	31.3 mg
10	20 mg	23.8 mg
12	15.2 mg	18.0 mg

Sources

Red Bull GB product informationUK product page for the standard 250 ml can.
General estimate — source details not recheckedUSDA FoodData CentralRepresentative reference value; not a promise for every bean or brewing method. This link opens the USDA database, not the exact food entry. Treat the serving amount as approximate. The date shown here does not mean we rechecked the original entry on that day.

Find lower-caffeine alternatives to Red Bull Energy Drink or compare drinks against a bedtime target.

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Alternatives without another energy-drink dose

A bottle for plain water and a specifically caffeine-free cola variant. Neither is a sports-performance or health recommendation.

As an Amazon Associate I earn from qualifying purchases. How paid links work.

AdSistema Hydrate Tritan Active bottle · 800 mlA reusable bottle for plain water when you want a drink without another stimulant dose. It doesn’t measure hydration needs or treat caffeine effects.View product and current reviews on Amazon UK
AdCoca-Cola Zero Sugar Caffeine Free · 8 × 330 mlThe specifically caffeine-free cola variant—not ordinary Coca-Cola Zero Sugar. Check the current pack and selected variant; caffeine-free isn’t a general health claim.View product and current reviews on Amazon UK

Selections checked 24 October 2026. Ratings, availability and product details can change. Check the current reviews, exact variant, ingredients and pack size on Amazon before buying. No Amazon stars, prices or customer reviews are reproduced here.