How to dial in a V60.

Dialling in is not a hunt for a magic number. It is a loop: brew, taste, change exactly one thing, brew again. This is the order to change things in, and how to know which one to reach for.

Start from a known baseline

You cannot dial in from nowhere. Fix everything except grind and brew this:

Weigh everything. Timing and weight are the only two instruments you have, and guessing either one makes the whole loop meaningless.

Taste first, then decide

Almost every bad V60 is one of two faults, and they are easy to confuse. The distinction is where you feel it, not how strong it is.

What you taste	What it means	What to do
Sour, sharp, salty, thin, empty finish — makes you wince at the front of the tongue	Under-extracted. Not enough came out.	Grind finer
Bitter, drying, harsh, hollow, lingering ashy finish	Over-extracted. Too much came out.	Grind coarser
Balanced but weak and watery	Correct extraction, too little coffee	Tighten the ratio, don't touch the grind
Balanced but overwhelming	Correct extraction, too much coffee	Widen the ratio

That third and fourth row are the ones people get wrong. Strength and extraction are different problems. If the flavours are right and there is just too much or too little of them, the grind is already correct — change the ratio instead.

The order to change things

1. Grind. Your primary control, and the only one to touch while the cup is still sour or bitter. Move in small steps — two or three clicks on most hand grinders — and rebrew.
2. Ratio. Once the flavour is clean, set strength. Between 1:15 and 1:17 for most filter coffee.
3. Temperature. Use it for stubborn cases. Hotter extracts more, which helps dense light roasts that stay sour even when ground fine. Cooler helps dark roasts that turn bitter however coarse you go.
4. Agitation and pour technique. Last, and least. Swirling, stirring the bloom, and pouring more aggressively all raise extraction. Useful for fine-tuning, useless for fixing a badly ground cup.

One change per brew. Change two and you learn nothing about either.

Read the drawdown

Total time is a diagnostic, not a target — but it tells you whether your grind is even plausible.

• Under 2:15. Water is running straight through. Grind finer, and check you are not pouring so hard that you are boring a channel through the bed.
• 2:45–3:15. Normal for 15 g. Judge by taste from here.
• Over 4:00. The bed is clogging. Grind coarser. If it stalls even at a coarse setting, you have too many fines — usually a blunt or badly aligned burr set.

Things that quietly ruin a brew

• Stale beans, or beans too fresh. Under three days off roast, the CO₂ still degassing disrupts the bed. Past about four weeks, the cup flattens no matter what you do.
• Not rinsing the filter. Paper taste, and a cold brewer that drops your real brew temperature well below the number on the kettle.
• An uneven bed. Pour in circles, keep the grounds off the paper walls, and give it a gentle swirl at the end of the last pour to settle the bed flat.
• Kettle temperature drift. A gooseneck off the boil loses heat fast. If you are not using a temperature-controlled kettle, brew promptly.
• Changing beans mid-dial-in. Every coffee needs its own setting. A new bag resets the loop — expect to move the grind, especially between processes and roast levels.

Write it down

The reason most people re-solve the same coffee three times is that they never recorded what worked. Dose, grind setting, water, temperature, total time, and one line on how it tasted is enough. After a few bags the pattern becomes obvious: you will find you grind consistently finer for washed Ethiopians and coarser for naturals, and you can start new bags from a much better first guess.

← Read next: the 4:6 method, explained