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Coffee Shop Caffeine Calculator
Build a Starbucks or Costa UK order using documented servings. Add drinks, inspect extra-shot estimates, and compare lower-caffeine alternatives.
Build your drink
The next occurrence of your bedtime is used. Choose a valid time. Half-life is an assumption, not a personal measurement.
Choose a drink and valid quantity to see the breakdown.
Starbucks: understand the documented range
This UK dataset covers 0.2 mg for Starbucks UK Youthberry Tea (Short) through 324.2 mg for Starbucks UK Freshly Brewed Coffee (Venti). These are serving comparisons, not a claim about every drink currently sold.
Starbucks Tall, Grande and Venti servings do not always rise proportionally in caffeine. Some sizes share a shot count, while brewed coffee, tea and Frappuccino recipes use different ingredients. The UK figures must not be substituted for US servings.
Decaf is included only when a numeric value is documented. Costa has a listed decaf pod value; this dataset does not provide equivalent Starbucks decaf recipes. Pret, Caffè Nero, Greggs and McDonald’s remain in the database with their existing evidence warnings but are excluded from this builder.
Common questions
What is the strongest Starbucks drink here?
The largest documented serving in this UK dataset is Starbucks UK Freshly Brewed Coffee, Venti, at 324.2 mg. The range is limited to the records and source dates shown.
Does a larger Starbucks drink always contain more caffeine?
No. Some sizes share the same caffeine figure while others use more espresso, tea or coffee. Use the size-specific values in the selector.
Can I calculate Starbucks decaf or a different espresso blend?
Only documented recipes are available. Custom extra shots use the standard UK espresso record as an estimate; unsupported decaf and special blends are not assigned invented figures.