Will coffee dehydrate you? If you are concerned about the detrimental effects of coffee on your hydration status, this article is for you. Definitions How much caffeine is in coffee? The amount of caffeine in coffee drinks is highly variable. For example, the following have been found to affect how much caffeine is in brewed coffee: species (i.e. Robusta vs Arabica), temperature of brewing water, coffee to water ratio, volume of coffee drink, origin of coffee beans and method of growing, among other factors (4). The table below shows some averages based on Australian data (5): However, actual values in your coffee can be all over the place. For example,…