Pour over coffee ratio calculator

Every pour over dripper controls flow rate differently, and flow rate determines how long water stays in contact with the coffee. The V60 has a single, large hole at the bottom — water drains fast. The Kalita Wave has three small holes — water drains slower. The Chemex has no holes at all (the filter drapes over the pour spout), and its thick filter creates the slowest draw-down of the three.

Faster drainage means less contact time, which means less extraction per gram of coffee. The V60's tight 1:15 ratio compensates — more coffee relative to water ensures adequate flavor even with the quick pass-through. The Kalita's slower drainage extracts more from each gram, so a lighter 1:16 avoids over-extraction. If you use a V60 ratio in a Kalita, the result tends toward bitterness. If you use a Kalita ratio in a V60, the coffee tastes thin.

Grind size plays the same compensating role. The V60 uses a finer grind to slow water and increase surface-area contact during the brief pass-through. The Kalita uses a medium grind to avoid over-slowing the already-restricted drainage. Getting the ratio and grind matched to your specific dripper is how pour over moves from "okay" to genuinely good.

The bloom is the first 30 seconds of any pour over brew. You pour a small amount of water — roughly twice the coffee weight (23g coffee → 46ml water) — and wait. The grounds swell, bubble, and release trapped CO₂ from the roasting process. Fresh-roasted coffee blooms dramatically; old, stale coffee barely reacts.

Skipping the bloom doesn't ruin the coffee, but it does create uneven extraction. CO₂ trapped in the grounds repels water — gas pockets form channels where water rushes through without extracting, while adjacent areas get no water at all. The 30-second bloom allows most of the gas to escape before the main pour, ensuring the water contacts the grounds evenly during the rest of the brew.

The bloom is also a freshness indicator. If you pour water on your grounds and nothing happens — no swelling, no bubbles — the coffee is more than 3-4 weeks past roast. It'll still brew, but you've lost a significant portion of the volatile aromatics that make pour over interesting. Coffee within 7-14 days of roast produces the liveliest bloom and the best cup.

The V60 rewards precision and punishes sloppiness. Its single large drain hole and spiral ridges create a fast, unrestricted flow — pour technique, grind consistency, and timing all matter significantly. Small changes produce noticeable flavor shifts. This makes the V60 both the most capable and the most unforgiving pour over dripper. If your grinder is inconsistent or your pour is unsteady, the V60 amplifies those flaws.

The Kalita Wave is more forgiving. Its flat bottom and three restricted drain holes create a more uniform extraction regardless of pour technique. Even a sloppy, fast pour produces a decent cup because the drainage restriction limits how fast water can leave the bed. The flavor ceiling is slightly lower than a perfectly executed V60, but the floor is much higher. For daily brewing where you want good coffee without full concentration, the Kalita is the practical choice.

If you want clarity and brightness (fruit-forward light roasts, single-origin coffees), lean toward the V60. If you want consistency and sweetness (chocolatey medium roasts, blends), the Kalita tends to produce more satisfying results with less effort. Both are excellent. Neither is objectively better.