Drink comparisons · Evidence-led guide
Pepsi Max vs Pepsi Zero Sugar: UK and US caffeine figures
The short answer
CaffCalc’s 63 mg figure belongs to the documented US 20 fl oz Pepsi Zero Sugar bottle. It must not be copied onto a UK Pepsi Max serving. The reviewed UK page confirms caffeine as an ingredient but does not give an amount.
Inspect the documented servings
These values come from the linked catalogue records. A source-backed record is not a measurement of your drink or a guarantee of a current recipe.
| Drink / market | Serving | Caffeine | Per 100 ml | Evidence / action |
|---|---|---|---|---|
| Pepsi Zero SugarUS | 20 fl oz / 591 ml | 63 mg | 10.7 mg (calculated) | Manufacturer listedVerified source record · Reviewed 2026-08-21Use this dose · Compare |
Bars use the selected measure; numbers remain visible in both units. No bar is drawn for an undocumented concentration. Per 100 ml = serving caffeine × 100 ÷ documented volume.
Match product, market and package
Zero sugar describes sugar content, not a standard caffeine formulation. A 20 fl oz US bottle and a 330 ml UK can differ in volume before any recipe differences are considered. Check the country, full product name and package size together.
Why we leave the UK number unknown
The official UK ingredients establish presence, not quantity. We do not substitute a US concentration or a figure from an unrelated comparison site. The US record below retains its original source-review date; its source endpoint could not be reverified during the September editorial check, so check the bottle in hand.
Use the label for partial bottles
If a label gives caffeine per complete bottle, the fraction consumed scales that amount. Half of a labelled 63 mg bottle corresponds to 31.5 mg by arithmetic. That calculation applies only to that formulation; it does not verify an unlabelled or differently named product.
Caffeine-free is a separate choice
Pepsi UK also markets Pepsi Max No Caffeine. Look for that explicit name instead of assuming that a “Max”, “Diet” or “Zero” label means no caffeine. A precise numeric UK comparison will be added only when a suitable primary source is available.
Sources and scope
- PepsiCo Product FactsUS product and serving; smaller packages and other markets can differ. Source reviewed 2026-08-21.
- Pepsi UK: Pepsi MaxReviewed 24 September 2026: caffeine appears in the ingredients; this page does not supply a numerical caffeine amount.
Educational information, not medical advice. Published, calculated and approximate values have different limits. Check the current product label or recipe when an exact amount matters.