How much caffeine is in your coffee
Caffeine by method and cup size, with the variables that move it.
Guides
Short, practical, no gear worship. Written for people who already own a scale.
Workflow
How to Dial In Espresso: The Order of Operations
Set the yield, fix the grind, taste, repeat. Includes the three-shot rule for grinder retention and a troubleshooting table that separates channelling from bad grind.
BasicsEspresso Ratio Explained: Ristretto to Lungo
Why ratio is measured by weight and not volume, the four ratios that matter, and why dark roasts want a shorter shot than light ones.
Water temperature for coffee
92°C vs 96°C, and whether boiling water ruins coffee.
Why your coffee tastes bitter
Six ranked causes with the fix for each.
Storing coffee beans properly
The four enemies, and whether the freezer works.
Espresso yield, in grams
Espresso yield explained in grams — what 1:2 means, when to break it.
The golden ratio is three different numbers
Where 1:15, 1:16 and 1:18 came from, and how to pick one.
Brew time chart, and how to read it
Target times for seven methods plus the four-quadrant diagnostic.
Grind size chart
Which grind for which brewer, from Turkish to cold brew.
Coffee ratio chart
Nine brew methods, dose and water in grams. Printable.
Basket size chart
Correct dose for every espresso basket size.
Practical troubleshooting
Why does my espresso taste sour
Six causes ranked by likelihood, and why grinding finer only fixes half of them.
Basics
How much coffee per cup
Exact grams for 6, 8, 10 and 12 oz cups, for every brew method.
Basics
Espresso grind size
Why the number on your grinder means nothing, and four ways to check the grind.
Brew guides
French press ratio
The right ratio, how long to steep, and a gram table for every press size.
Brew guides
V60 ratio and recipe
Ratio, temperature, grind and a four-pour schedule that actually works.
Brew guides
Cold brew ratio
Concentrate or ready-to-drink, with grams for every batch and a steep table.
Brew guides
AeroPress ratio
Three ratios, three drinks — concentrate, standard cup and long black.
Basics
Coffee to water ratio
The complete reference: grams per method and how to adjust for taste.
Method
Make espresso without a machine
Moka pot, AeroPress and French press — what actually gets close, and what does not.
Brew guides
Best ratio for drip coffee
Grams per cup and per pot, and why your machine's cup markings are wrong.
Basics
Grind size for drip
What medium grind looks like, and how to diagnose it from taste alone.
Buying guide
Best espresso machine under $500
What the money actually buys, which specs matter, and what is marketing.
Buying guide
Best grinder for espresso
Why the grinder matters more than the machine, and what to spend.
Or skip straight to the tools
Seven calculators covering espresso, filter, water and milk.