You've probably heard someone order an extra-strong coffee because they need waking up. But coffee that tastes stronger doesn't necessarily contain more caffeine. Flavour strength and caffeine content are different things.
What does strong coffee mean?
It might mean a bold flavour, a dark roast, more coffee relative to water or simply more caffeine. Those aren't interchangeable. A bold-tasting cup can have less caffeine than a milder-tasting one.
Does dark roast have more caffeine?
Not automatically. Roasting changes flavour, colour, density and weight, but doesn't create caffeine. Darker roasts can taste more intense because of their roasted flavours. When comparing similar beans by weight, bean type and the amount used generally matter more to caffeine content than roast colour.
What determines caffeine content?
Bean species: Robusta generally contains considerably more caffeine than Arabica.
Amount of coffee: using more grounds can increase the caffeine extracted.
Brewing: grind, water and contact time affect extraction.
Serving size: a large mug of filter coffee can contain more total caffeine than a small espresso.
Is espresso stronger than filter coffee?
Espresso is more concentrated, so it usually tastes stronger per sip and has more caffeine per millilitre. But a full mug of filter coffee can have more caffeine overall because the serving is larger.
Does milk reduce caffeine?
Milk changes the taste and concentration of the finished drink but doesn't remove caffeine already in the coffee. A latte made with two espresso shots still contains the caffeine from those shots.
How do I choose bold-tasting coffee?
Choose by flavour profile rather than assuming dark roast equals extra caffeine. The Usual combines Arabica and Robusta and has bold milk-chocolate and praline notes. Explore The Usual.
Frequently asked questions
Does bitter coffee contain more caffeine? Not necessarily; bitterness also comes from roasting and brewing.
Does Robusta have more caffeine? Generally, yes.
Does a double espresso have more caffeine than a single? Usually, because it uses more coffee.