These figures apply CaffCalc’s exponential model to the adjusted 80 mg starting value. They are calculations, not measurements of caffeine in a particular person.
Calculated caffeine remaining from a 80 mg serving
Hours elapsed
3-hour half-life
5-hour half-life
7-hour half-life
0
80 mg
80 mg
80 mg
3
40 mg
52.8 mg
59.4 mg
5
25.2 mg
40 mg
48.8 mg
8
12.6 mg
26.4 mg
36.2 mg
10
7.9 mg
20 mg
29.7 mg
12
5 mg
15.2 mg
24.4 mg
With the central five-hour model, the estimate falls below 25 mg after approximately 8.4 hours. The faster and slower columns show why one fixed clearance time shouldn’t be treated as a personal fact.
Use this caffeine value
Use this amount in a calculation, or save the drink to your tracker on this device.
