Brew Guide
How to Adjust Your Pour Over for the Perfect Cup
Master the four key variables that control how your coffee tastes—and learn why changing one at a time is the secret to dialing in your brew.
The Fundamentals
Four Variables, One Perfect Cup
To make the perfect pour over, adjust four brew variables: grind size, water temperature, brew time, and coffee dose. Change only one variable at a time, brew between 195–205°F, and use a 16:1 water-to-coffee ratio as your starting point. Finer grinds produce stronger coffee; coarser grinds produce lighter cups.
Most people jump in and change everything at once. That's the fastest way to get lost. The single most important rule in dialing in your coffee is this: change one thing, taste, then decide. This approach turns brewing from guesswork into a repeatable system.
The Brew Variables
What Each Variable Does
A note on brew time: For non-steeping methods like the Chemex, Kalita Wave, and V60, brew time is not an independent variable—it is a result of grind size. A finer grind slows the water, extending brew time. A coarser grind lets water pass through faster. So when you adjust grind size on these brewers, you're also adjusting brew time.
Step by Step
How to Dial In Your Brew
Start with a Baseline Recipe
Use a 16:1 water-to-coffee ratio, a medium grind (about the texture of table salt), and water at 200°F. Brew a cup and pay attention to the flavor before changing anything.
Change One Variable at a Time
This is the golden rule. If your coffee is sour, try a finer grind—don't also raise the temperature. Isolating variables is the only way to understand what each one does to your cup.
Adjust Grind Size First
Grind size has the biggest impact on flavor. Finer grinds extract more, producing a stronger and sometimes bitter cup. Coarser grinds extract less, yielding a lighter and sometimes sour cup. For pour over brewers, this also directly controls your brew time.
Dial In Water Temperature
Stay between 195°F and 205°F. Above 205°F and you risk pulling harsh, bitter compounds from the coffee. Below 195°F and you'll under-extract, leaving behind the sweetness and complexity. A gooseneck kettle with a built-in thermometer makes this easy.
Fine-Tune Your Dose
Once grind and temperature are dialed in, adjust your ratio. Try 15:1 for a bolder cup or 17:1 for something lighter. Small changes here make a noticeable difference.
Taste, Note, Repeat
Keep a simple log—even a note on your phone—of what you changed and how the cup tasted. Within three or four brews, you'll find the sweet spot for that particular coffee.
Quick Reference
Troubleshooting Your Cup
Tastes Bitter or Harsh?
- Grind coarser
- Lower water temperature (stay above 195°F)
- Check that water isn't exceeding 205°F
- Reduce brew time (coarser grind will do this naturally)
Tastes Sour or Weak?
- Grind finer
- Raise water temperature (up to 205°F)
- Increase coffee dose
- Extend brew time (finer grind will do this naturally)
Tastes Flat or Muted?
- Use fresher beans (3–14 days after roast)
- Increase water temperature slightly
- Try a finer grind for more extraction
- Make sure you're using filtered water
Brew Drains Too Fast/Slow?
- Too fast: grind finer
- Too slow: grind coarser
- Check that your filter is seated properly
- Rinse paper filters before brewing
Common Questions
Pour Over Brewing FAQ
What is the ideal water temperature for pour over coffee?
Brew between 195°F and 205°F (90–96°C). Temperatures above 205°F can over-extract and cause bitterness. Below 195°F tends to under-extract, producing a sour or weak cup.
How does grind size affect pour over coffee?
Finer grinds produce a stronger, more extracted cup because water contacts more surface area. Coarser grinds produce a lighter cup. For pour over brewers like Chemex, V60, and Kalita Wave, grind size also controls how long the water stays in contact with the coffee.
Why should I only change one brew variable at a time?
Changing one variable at a time lets you isolate the effect of each adjustment. If you change grind size and temperature at the same time, you won't know which change improved or worsened your cup—making it impossible to dial in consistently.
What is the best coffee-to-water ratio for pour over?
A 16:1 water-to-coffee ratio is a great starting point. Use 15:1 for a bolder cup or 17:1 for a lighter one. For example, at 16:1 you'd use 256g of water for 16g of coffee.
Why does my pour over coffee taste bitter?
Bitter coffee is usually over-extracted. Try a coarser grind, lower your water temperature (stay within 195–205°F), or check that your brew time isn't too long. Also ensure your water temperature isn't exceeding 205°F.
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