Brew Specialty Coffee,
by the exact gram.
Free coffee calculators: brew ratios by method, doses for any cup size, grind-size guidance, cold brew concentrate math, and caffeine tracking.
SCA Golden Cup Ratios
Calculates standard 1:15 to 1:17 ratios so your extraction neither turns unpleasantly sour nor hollowly bitter.
Water-to-Ground Precision
Account for coffee bed water retention (~2x dry dose) to pour the exact liquid yield you want in the cup.
Cold Brew & Concentrate
1:4 heavy concentrate to 1:8 ready-to-drink brew formulas with steep timing guidance.
CoffeeMath Calculators
Coffee Brew Ratio Calculator
Coffee and water grams for any method and cup size — from espresso 1:2 to French press 1:15.
Cold Brew Ratio Calculator
Cold brew concentrate math — coffee, water, steep time, and the dilution that turns concentrate into cups.
Caffeine Intake Calculator
Caffeine per cup by brew method and dose — daily totals against the 400 mg guideline.
Grind Size Guide Calculator
Grind guidance by method and taste — with the adjustment grammar that turns bad cups into good ones.
Mastering the Craft
The scale changes everything: coffee by grams, not scoops
The twenty-dollar upgrade that outperforms thousand-dollar machines, and the morning workflow that makes it effortless.
Water: the ingredient nobody tastes and everybody should fix
Hardness, chlorination, and the cheap fixes that change the cup more than the beans' pedigree.
12 mistakes people make with coffee brewing
The recurring errors we see in coffee brewing — what causes each one, and the habit that prevents it.