What the 4:6 method is
In 2016, Tetsu Kasuya won the World Brewers Cup — the sport’s most competitive stage — brewing a V60 with a recipe he’d built around a simple idea: split your brew water into two purposeful zones instead of pouring it in one continuous stream. The first 40% of the water, delivered in two pours, sets the cup’s taste balance — how sweet versus how bright it reads. The remaining 60%, delivered in one to three pours, sets the cup’s strength — how concentrated it is. Everything else about the brew (grind, temperature, dripper) is intentionally kept out of the decision tree.
That’s the method’s real innovation. Most pour-over advice treats grind size, water temperature, pour technique and timing as one tangled knot you nudge all at once when a cup tastes off. The 4:6 method separates two of the biggest levers — taste balance and strength — into two independent, clearly labeled controls, each with a small number of named settings. You don’t need years of dial-in intuition to change one specific thing on purpose. You pick a taste setting and a strength setting, and the pour schedule does the rest. It rewards consistency over technique obsession, which is exactly why it travels so well from a competition stage to a Tuesday morning kitchen.
Why it works
The mechanism behind the split is extraction sequence. As hot water moves through a coffee bed, it doesn’t pull out every compound at once and in proportion — acids and simple sugars are more soluble and extract early in the pour, while the bitter, heavier compounds that define a coffee’s body extract progressively later. The very first water to touch the grounds therefore has an outsized influence on the acid-to-sweetness ratio you taste, because it’s pulling from a disproportionately “early-extraction” slice of the bed’s soluble material.
That’s why the 4:6 method puts taste control entirely in the first two pours. Make the first pour smaller relative to the second, and you keep the bed drier for a beat longer before the larger second pour arrives — concentrating early extraction and reading sweeter. Make the first pour larger, and you flood the bed sooner, extracting more of the bright, acidic compounds earlier and reading brighter. By the time you reach the last 60% of the water, most of that early-extraction character has already been set; the remaining pours are mostly diluting and equalizing, which is why the last four-tenths’ worth of decisions is really just about how much water you add and how you add it — strength, not flavor character.
The five decisions, one at a time
Take Kasuya’s own worked example: 20 g of coffee at a 1:15 ratio gives 300 g of total water. Phase 1 is 40% of that — 120 g — split across two pours. On the Standard taste setting, that’s an even 60 g then 60 g. Switch to Sweeter and the calculator shrinks the first pour and grows the second — about 50 g then 70 g — keeping the bed drier for longer before the flood arrives. Switch to Brighter and it flips: about 70 g then 50 g, flooding the bed sooner for a livelier, more acidic cup.
Phase 2 is the remaining 180 g (60% of 300 g), and the strength setting decides how it’s delivered. Medium splits it into two 90 g pours. Stronger splits it into three 60 g pours — more pours means more agitation and a slightly longer contact time, nudging concentration up. Lighter delivers it in a single 180 g pour — the simplest possible version of the method, with just three pours total. Change one setting at a time and taste the difference before changing the other — the same one-variable-at-a-time discipline that makes espresso dial-in legible instead of chaotic applies here too.
Grind and gear
Grind coarser than you would for a single continuous-pour V60 recipe — medium-coarse, closer to sea salt than to table salt. The reason is structural, not a matter of taste: the 4:6 method pours on a fixed 45-second clock no matter how the bed is draining. If your grind is fine enough to slow drawdown below that pace, each new pour lands on top of water that hasn’t finished draining from the last one, and the cone eventually overflows or stalls into a stagnant, over-extracted mess. A coarser bed keeps the drawdown rate ahead of the pour schedule instead of behind it.
A conical dripper with a single large hole and spiral internal ribs — the V60’s signature geometry — drains fastest and gives you the most room for error here. Flatter drippers with smaller or multiple holes restrict flow more and may need an even coarser grind to keep pace. Water temperature matters too: 90–93°C is the practical range for most roasts, with lighter roasts benefiting from the hotter end of that range to fully extract their denser cell structure, and darker roasts doing better nearer the cooler end to avoid tipping into bitterness.
Reading your drawdown
Two failure modes show up in the drawdown, and both point to a grind fix. A stall — water pooling above the bed and draining sluggishly, pushing your total time well past 3:30 — usually means your grind is too fine, or fines migration (a cloud of ultra-fine particles clogging the filter) is choking flow even at a reasonable average grind size. Coarsen on the next brew, and consider a gentler pour technique that disturbs the bed less. A gusher — drawdown finishing well before 3:00, with a thin, weak-tasting cup — usually means the grind is too coarse for the bed to build any resistance, so water rushes through under-extracted. Fine down slightly and retest.
Either way, change only the grind between brews while everything else — dose, ratio, taste and strength settings — stays fixed. That’s the same instrument-panel principle the whole method is built on: one dial at a time, so you always know which change produced which result.
4:6 vs. classic continuous pour
A continuous pour — one long, steady stream from bloom to finish — gives you the most real-time control: you can read the bed as you go and adjust on the fly, which is why many baristas prefer it once they’ve built the intuition for it. But that same flexibility makes it hard to reproduce exactly, and even harder to teach precisely. The 4:6 method trades a little of that moment-to-moment control for total reproducibility: five (or fewer) discrete, timed, weighed pours that taste the same on a Tuesday as they did on a Sunday, and that you can hand to someone else as a written recipe rather than a felt technique. If you want to understand pour technique more broadly — including where continuous pours and pulse pours fit — the V60 vs. Chemex pour-over comparison is the natural next read. And if you want to take the same 4:6 splits and adapt them for a flash-brewed iced cup, the Japanese Iced Coffee Splitter picks up exactly where this tool leaves off.
