If there’s one question that’s sparked more heated debates in our roastery than "who left the lights on," it’s this: Which has more caffeine—light roast or dark roast coffee?
Usually, the person arguing for the Dark Roast thinks the bold, smoky "punch" to the palate is a direct sign of a caffeine heavyweight. Meanwhile, the Light Roast fan insists that because the beans spent less time in the heat, the caffeine hasn't been "cooked out" yet.
Well, after thirty-some years of roasting, it’s time to settle the score. Pull up a chair.
The Myth of the "Cooked Out" Caffeine
First, let’s clear the air: Caffeine is a remarkably stable little molecule. It’s tough. It doesn't just evaporate because the roaster got a few degrees hotter. Bean for bean, there is no fundamental difference in the caffeine levels between a light roast and a dark roast.
The confusion doesn't come from the chemistry; it comes from the scale.
It’s a Weighty Issue
When we roast coffee, the beans lose water. A light roast is in the heat for a shorter duration, meaning it keeps more of its water weight. A dark roast stays in longer, becomes more porous, and ends up much lighter and "puffed up."
If you were to weigh out a pound of our light roast and a pound of our dark roast, you’d find more coffee in the bag of dark roast. It simply takes more beans to reach that pound once they've been roasted.
What This Means for Your Morning Mug
The answer to "which has more caffeine" actually depends entirely on how you measure your coffee at 7:00 AM:
The "Scooper" — Measurement by Volume
If you use a scoop, light roast wins. Because light roasted beans are denser and smaller, you can fit more of them into that plastic scoop. More beans = more caffeine.
The "Scale Artist" — Measurement by Weight
If you're a pro who weighs your coffee on a kitchen scale, dark roast wins. Because you're using more physical beans to reach that 20-gram target, you're getting a higher caffeine yield in the pot.
At the end of the day, choosing between a light and dark roast based on caffeine is like choosing a car based on the color of the floor mats. Just choose for flavor, man.
If you want those bright, floral, citrusy notes that tell the story of a specific hillside in Colombia, go Light. If you want that deep, chocolatey, "tribute to the campfire" soul, go Dark.
We’ve spent decades perfecting both, so you really can’t go wrong. Just pick your brew and let the caffeine handle itself.
