Free tool · takes 30 seconds
Grind-Size Diagnostic
Shot too fast, too slow, sour, bitter? Three quick questions and a specific call — grind finer, grind coarser, or leave the grind alone.
Your call
How this works
This uses the exact same sour-vs-bitter, fast-vs-slow logic from ourHow to Dial In Espresso guide — this tool just turns that framework into three quick questions instead of a full read. Shot time is a diagnostic clue, not the goal: taste is always the real judge, and this tool weighs both together rather than chasing a stopwatch number.
This is built for espresso specifically — the 25-30 second window and the sour/bitter framework are about pressurized extraction, which pour-over, French press, and moka pot don't share. Need the right starting ratio for one of those instead? Try the Coffee-to-Water Ratio Calculator.
If your issue turns out to be stale beans rather than grind, the Bean Freshness Calculatorwill tell you exactly where your current bag stands.