CoffeeBumper / 27 brewing calculators

Weigh it before you brew it.

Coffee is 98% water. The ratio decides whether it tastes sharp, flat, or right, and the correct ratio changes by method. These calculators use Specialty Coffee Association brewing targets as their starting point.

SCA target range75–250 mg/L TDS
Methods covered27, growing weekly
Cost to use$0
Pour-over

Quick Ratio Check

1:16
25 grams
Water400 ml
Yields1–2 cups
MethodPour-over

Pour-over defaults shown. Every method has its own calculator.

Open full tool
01

Numbers, not house style

Each calculator’s default ratio matches SCA brewing targets. You can still adjust it, but you start from a documented baseline.

02

One tool per method

A Moka pot and a Chemex extract coffee differently. Ratio, grind size, and time are calculated separately for each of the 27 methods.

03

Gear reviewed on results

Product picks are based on what the machine produces in the cup, including the ones that did not make the list.

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Do not know your method’s ratio?

Start from the calculator hub. Every method is listed with its default ratio up front.

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