How to use a scale for coffee (and why it matters)

A scale does two jobs: it makes your brewing repeatable, and it makes troubleshooting faster. Without weights, you end up changing multiple variables without realising it.

At home, the most useful measurements are:

• Dose: coffee in grams

• Water weight: water in grams (filter)

• Yield: coffee out in grams (espresso)

Quick diagnosis

If any of these are happening, a scale will fix more than you expect.

• You can brew one great cup, then never repeat it.

• Your espresso swings between thin and harsh.

• You are not sure if a change helped, because too many things moved at once.

What to do first

1. Start by weighing dose
   Pick a dose you can repeat comfortably, then keep it stable while you dial in.

2. Use ratio to control strength
   Ratio is the simplest way to adjust strength without guessing.

3. For espresso, weigh yield
   Yield is how you control strength and extraction together, and it is hard to judge by volume.

Practical ratios (simple starting points)

Pour over (V60)

A common baseline is around 1:16 to 1:17.
Example: 15 g coffee to 240 to 255 g water.

AeroPress

A practical baseline is around 1:15.
Example: 15 g coffee to 220 to 230 g water.

Plunger

A common baseline is around 60 g per litre, then adjust to taste.
Example: 30 g coffee to 500 g water.

Espresso

Start with a stable dose and use yield ratios to dial in.
Example: 20 g in, then test yields like 40 g out (1:2), 45 g out (1:2.25), or 50 g out (1:2.5).

How to use the scale in your workflow

Filter and immersion

• Put your brewer and vessel on the scale.

• Zero it.

• Add coffee, confirm dose.

• Zero again if needed.

• Pour to your target water weight.

Espresso

• Weigh your dose in.

• Put your cup on the scale, zero it.

• Start the shot and stop at your target yield.

Common scale mistakes

• Weighing coffee but not water, then wondering why the cup changes

• Using volume for espresso yield (crema makes this unreliable)

• Changing dose and grind at the same time

• Not zeroing the scale when switching between steps

FAQs

Do I need a scale accurate to 0.1 g?
It helps for espresso. For filter, 1 g accuracy can still work, as long as you are consistent.

If I change the dose, do I need to change the grind?
Often, yes. Dose changes can affect flow and time, especially for espresso.

Why does weighing espresso matter if I already time my shots?
Time tells you what happened. Yield tells you how strong the drink is. You need both to make adjustments cleanly.