Caffeine Concentration

This formula tells you how much caffeine is packed into each millilitre of a drink by dividing the total caffeine mass by the drink’s volume. It works because concentration is a "per unit volume" measure: the same amount of caffeine spread over a larger drink gives a smaller concentration, while the same amount in a smaller drink gives a larger one. The result is useful for comparing drinks of different sizes on an equal basis.

Use this when you want to compare the strength of different caffeinated drinks, such as energy drinks, coffees, or teas, especially when their serving sizes are not the same. It is also helpful when estimating how concentrated a homemade drink or extract is.

• Using grams and millilitres without converting units consistently
• Dividing the volume by the caffeine amount instead of caffeine by volume
• Comparing drinks by total caffeine only and ignoring different serving sizes