UK · Energy drinks

How much caffeine is in Monster Ultra White?

150 mgManufacturer listed · 500 ml can30.0 mg per 100 ml, calculated from the listed serving

Monster Energy UK lists 150 mg of caffeine in the 500 ml zero-sugar Ultra White can.

Interactive serving

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ServingNumber of servingsAmount in mlScaled from the documented 500 ml serving; the source evidence label still applies.

Adjusted caffeine total150 mgBased on the selected listed serving.

Where this figure comes from

Source: Monster Energy UK Ultra product information
Source type: Manufacturer
Market: UK
How we got the amount: Manufacturer listed
Source reviewed: 23 October 2026

Official UK product page; Monster notes figures are based on 500 ml and can vary by region.

Estimated caffeine remaining over time

These figures apply CaffCalc’s exponential model to the adjusted 150 mg starting value. They are calculations, not measurements of caffeine in a particular person.

Calculated caffeine remaining from a 150 mg serving
Hours elapsed	3-hour half-life	5-hour half-life	7-hour half-life
0	150 mg	150 mg	150 mg
3	75 mg	99.0 mg	111.4 mg
5	47.2 mg	75 mg	91.4 mg
8	23.6 mg	49.5 mg	67.9 mg
10	14.9 mg	37.5 mg	55.7 mg
12	9.4 mg	28.4 mg	45.7 mg

With the central five-hour model, the estimate falls below 25 mg after approximately 12.9 hours. The faster and slower columns show why one fixed clearance time shouldn’t be treated as a personal fact.

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