SARAP Coffee Calibration System
A Simple Guide to Dialling In Espresso Without Overthinking It

What is Coffee Calibration?

Coffee calibration (or “dialling in”) is the process of adjusting variables to achieve a balanced espresso extraction. At its core, espresso is:

The resistance of water flowing through coffee grounds under pressure.

So calibration is simply adjusting that resistance until the extraction tastes right.

Instead of overcomplicating it, we use a simple framework:

SARAP System

• S = Size of Grind
• A = Amount of Coffee (Dose)
• R = Roast Date
• A = Angle of Tamp
• P = Pressure (Machine)

🧠 The Golden Rule of Calibration

Before adjusting anything:

Change ONE variable at a time.

This is how professionals isolate problems and how you avoid confusion.

Step-by-Step Process of Elimination (What to Control First)

When your espresso tastes off, don’t guess. Follow this order:

STEP 1: Amount of Coffee (DOSE), CONTROL THIS FIRST

Start with consistency.

Recommended baseline:

• 18g espresso dose (standard café range)
• Range: 14g – 21g depending on basket size

Why does this comes first?

Because dose affects:

• Flow rate
• Extraction time
• Strength
• Balance

 If your dose changes, everything else changes.

STEP 2: Grind Size, YOUR MAIN TUNING TOOL

Grind size controls how fast water flows through coffee.

Simple logic:

• Too fast → grind finer
• Too slow → grind coarser

Why does it matter:

Grind size is your primary flavour dial:

• Sweetness
• Bitterness
• Acidity balance

At espresso level, this is your most powerful adjustment.

STEP 3: TAMPING (ANGLE + PRESSURE)

Tamping creates an even coffee bed.

What matters:

• Flat surface = even extraction
• Uneven tamp = channelling (water bypassing coffee)

Common mistake:

Slanted tamping → uneven flow → sour + bitter cup at the same time

Key idea:

You are not “pressing harder for better coffee”. You are creating an even resistance bed

STEP 4: ROAST DATE (FRESHNESS BEHAVIOUR)

Coffee changes as it ages.

Fresh coffee:

• More gas
• Faster extraction
• Can be unstable

Older coffee:

• Needs finer grind or higher dose
• Lower extraction efficiency

Rule of thumb:

Older coffee = slightly more adjustment needed to extract flavour

STEP 5: PRESSURE (LEAVE THIS LAST)

Most machines operate between:

• Home machines: 6–9 bars
• Commercial machines: up to 12 bars

Important truth:

You usually do NOT adjust pressure daily

Only check if:

• The machine is inconsistent
• Extraction is unstable
• Maintenance is overdue

If something is wrong here, clean your machine first.

How to Calibrate Espresso (Simple Workflow)

Use this exact sequence:

1. Lock your dose

Choose 18g (or basket-appropriate dose)

2. Taste your shot

Ask:

• Too sour?
• Too bitter?
• Too weak?

3. Adjust grind size ONLY

• Sour → finer grind
• Bitter → coarser grind

4. Check tamp consistency

Ensure flat, even tamp every time

5. Re-test extraction

Only after step changes

6. Adjust roast interpretation if needed

Older coffee = compensate with grind/dose adjustments

7. Ignore pressure unless something is clearly wrong

The Simplest Calibration Logic

If your espresso is:

❌ Too fast/sour

→ Grind finer

❌ Too slow/bitter

→ Grind coarser

❌ Weak

→ Check dose first

❌ Uneven taste

→ Check tamping

❌ Inconsistent

→ Check machine maintenance

☕ Why This System Works

At Mama Typica Speciality Coffee, we simplify espresso into:

Control what you can. Stabilise what you can’t.

Most beginners fail because they adjust too many variables at once.

This system forces clarity:

• One change at a time
• One result at a time
• One improvement at a time

🎯 Final Takeaway

Espresso calibration is not complicated. It is just a structured observation. When you follow SAR(A)P:

• You remove guesswork
• You gain control
• You improve consistency
• You understand coffee faster

And most importantly:

Great coffee is not about perfect machines; it is about understanding what to adjust.