Table 1.

Amount of caffeine in various forms of coffee preparation.

Coffee preparation	Volume of cup (mL)	Caffeine content (mg/cup)
Coction (boiling)	150–190	111–177
Filtering	50–190	28–161
Espresso	50–150	74–99
Percolation	150–190	55–88
Instant (soluble)	50–190	19–34

Adapted from Nehlig¹