What is the golden ratio for coffee?

The SCAA (Specialty Coffee Association of America) defines the golden ratio as 55g of coffee per litre of water — approximately 1:18. The SCA (updated standard) uses 60g per litre = 1:16.67. In practical terms: - 1:15 = slightly strong, rich flavour - 1:16–1:17 = balanced, widely used by specialty cafes - 1:17–1:18 = lighter, more delicate, closer to SCAA standard For home brewing, 1:15 is the most common starting point. Adjust to taste: - Too strong → increase ratio (use less coffee or more water) - Too weak → decrease ratio (use more coffee or less water) Note: the 'golden ratio' applies to filtered brewing methods (pour over, drip, French press). Espresso uses a completely different yield ratio (1:2).

How much coffee per cup?

This depends on what 'cup' means — the definition varies widely. US coffee maker 'cup' = 6 fl oz = 177ml (NOT the standard 8 fl oz mug) Standard mug = 8 fl oz = 237ml Large mug = 12 fl oz = 355ml Using 1:15 ratio: - 1 US coffee maker cup (177ml): 11.8g coffee ≈ 2 tbsp - 1 standard mug (237ml): 15.8g coffee ≈ 2.5 tbsp - 1 large mug (355ml): 23.7g coffee ≈ 4 tbsp Using the common 2 tablespoons per 6 oz rule: - 1 tbsp ≈ 6g ground coffee (medium grind) - 2 tbsp ≈ 12g per 177ml = 1:14.75 ratio For precision: use a kitchen scale. 1 tbsp of coffee varies from 4–8g depending on grind size and density — scales eliminate this uncertainty entirely.

What ratio should I use for espresso?

Espresso uses a yield ratio — the ratio of dry coffee (dose) to liquid espresso produced: Ristretto: 1:1 to 1:1.5 (7g in → 7–10g out) — very concentrated Espresso: 1:2 (18g in → 36g out) — standard double Lungo: 1:2.5 to 1:3 (18g in → 45–54g out) — longer pull This is different from filter ratios — espresso measures output (liquid espresso), not input water. Standard double espresso: - Dose (dry coffee): 18g - Yield (liquid): 36g - Ratio: 1:2 - Extraction time: 25–30 seconds - Pressure: 9 bar - Temperature: 88–94°C Adjusting espresso: - Sour/under-extracted → finer grind or longer extraction - Bitter/over-extracted → coarser grind or shorter extraction - Weak → more coffee (higher dose) - Channelling → better distribution and tamping

How do I make cold brew coffee?

Cold brew uses a much stronger ratio than hot methods because it is typically diluted before drinking: Concentrate (dilute 1:1 with water/milk before drinking): - Ratio: 1:4 to 1:5 - Example: 100g coffee + 400–500ml cold water Ready-to-drink (no dilution needed): - Ratio: 1:7 to 1:8 - Example: 100g coffee + 700–800ml cold water Method: 1. Grind coffee coarse (similar to French press) 2. Combine coffee and cold filtered water 3. Stir gently to ensure all grounds are wet 4. Cover and steep in refrigerator for 12–24 hours 5. Strain through a fine mesh strainer (then a paper filter for clarity) 6. Store in fridge for up to 2 weeks Why cold brew is less acidic: Cold water extracts different compounds than hot. Acids that cause stomach irritation (chlorogenic acids) extract more readily with heat — cold brew has 60–70% less acidity than hot brew.

How much coffee for a French press?

French press uses a 1:12 to 1:15 ratio by weight. Common French press sizes: 3-cup (350ml): - 1:15 ratio: 23g coffee (≈4 tbsp) - 1:12 ratio: 29g coffee (≈5 tbsp) 8-cup (1,000ml): - 1:15 ratio: 67g coffee (≈11 tbsp) - 1:12 ratio: 83g coffee (≈14 tbsp) 12-cup (1,500ml): - 1:15 ratio: 100g coffee (≈17 tbsp) French press method: 1. Coarse grind (important — too fine = over-extraction + bitter) 2. Preheat press with hot water, discard 3. Add coffee, pour water just off boil (93°C / 200°F) 4. Stir gently, place lid on (don't plunge yet) 5. Steep 4 minutes 6. Press slowly and steadily 7. Pour immediately — don't let it sit or it over-extracts

Why should I weigh my coffee instead of using tablespoons?

Tablespoon measurements are imprecise for coffee because: 1. Grind size affects density dramatically: - Extra fine (Turkish): 1 tbsp ≈ 8–9g - Fine (espresso): 1 tbsp ≈ 7–8g - Medium: 1 tbsp ≈ 5–7g - Coarse (French press): 1 tbsp ≈ 4–5g 2. Heaping vs level tbsp = 30–50% difference 3. Different coffees have different densities (light roast is denser than dark roast) Real-world example: A 'level tablespoon of medium-ground coffee' can be anywhere from 5g to 8g depending on how you measure — that's a 60% variation. At 1:15 ratio, this means your cup of coffee could range from 75ml to 120ml of water — tasting completely different. A kitchen scale accurate to 0.1g costs £8–15 and eliminates all this variation. Consistent results every time. This is why specialty coffee shops use scales for every brew.

COFFEE TO WATER RATIO CALCULATOR

Calculate the exact coffee-to-water ratio for any brew method. Supports 10 methods: Pour Over (V60/Chemex), French Press, AeroPress, Espresso, Cold Brew, Drip/Auto, Moka Pot, Siphon, Turkish Coffee, and Percolator. Three input modes: enter coffee grams to find water needed, enter water volume to fin...

COFFEE RATIO

Brew Method

Typical range: 1:15–1:17 · Grind: Medium-fine

Ratio (1:X)

1:1 (espresso)1:8 (strong)1:15 (balanced)1:25 (weak)

Balanced · 1g coffee : 15g water

Calculate from

Coffee (grams)

COFFEE

20g

≈ 3.3 tbsp

WATER

300ml

10.14 fl oz

20g × 15 = 300ml water (1:15 ratio)

LIVE DIAGRAM

RATIO

1:15

20g coffee → 300ml water

CoffeeWater

20g

300ml

6% of total weight94% of total weight

COFFEE (TBSP ≈)

3.3 tbsp

WATER (FL OZ)

10.14 fl oz

WATER (US CUPS)

1.27 cups

RATIO STRENGTH

Balanced

☕ Pour Over (V60 / Chemex)

GRIND

Medium-fine

TEMP

92°C / 198°F

TIME

3–4 min

SCAA golden cup: 55g/L. Most pour-over fans use 1:15–1:16 for balance.

Created with❤️byeaglecalculator.com

HOW TO USE

1
Select your brew method from the dropdown — 10 methods including Pour Over, French Press, AeroPress, Espresso, Cold Brew, Drip, Moka Pot, Siphon, Turkish, and Percolator. The ratio slider auto-sets to the method's default (e.g. 1:15 for pour over, 1:2 for espresso). The typical range and grind size appear instantly below.
2
Choose your input mode: Coffee (g) to find how much water you need, Water (ml) to find how much coffee to use, or Number of cups to calculate for a batch. Tap any preset or type your own amount. The brown/blue proportion bar shows your coffee-to-water split visually.
3
Adjust the ratio slider (1:1 to 1:25) or use the ± buttons to fine-tune strength. The right panel shows the strength label, all equivalents (tbsp, fl oz, US cups), and full brew method details — grind size, water temperature, and brew time. Use the reference table below for 10 methods side by side and the 13-row pour over quick reference.

BREW METHOD REFERENCE TABLE

Method	Ratio	Grind	Temp	Time	Notes
☕ Pour Over (V60 / Chemex)	1:15–1:17	Medium-fine	92°C	3–4 min	SCAA golden cup: 55g/L. Most pour-over fans use 1:15–1:16 for balance.
🫗 French Press	1:12–1:15	Coarse	93°C	4 min	Immersion brew. 1:12 = stronger. Use coarse grind to reduce bitterness.
🔄 AeroPress (standard)	1:6–1:15	Fine-medium	85°C	1–2 min	Most versatile. Standard 1:10–1:12. Inverted: 1:6 concentrate + dilute.
⚡ Espresso	1:1.5–1:3	Very fine	93°C	25–35 s	Yield ratio. 18g in → 36g out = 1:2 double. Lungo = 1:3. Ristretto = 1:1.5.
🧊 Cold Brew	1:4–1:8	Coarse	4°C	12–24 h	Concentrate: 1:4–1:5 (dilute before drinking). RTD: 1:7–1:8.
🔌 Drip / Auto Filter	1:15–1:18	Medium	93°C	5–8 min	US standard: 1 tbsp per 6 fl oz (≈1:17). Most machines calibrated here.
🫙 Moka Pot	1:7–1:10	Fine	93°C	5 min	Not espresso. Fill bottom chamber with cold water. Strong, intense.
🔬 Siphon / Vacuum	1:14–1:16	Medium	92°C	3–5 min	Theatre brewing. Clean, even extraction. Similar to pour over.
🌙 Turkish Coffee	1:10–1:14	Extra fine	93°C	3–4 min	Grounds not filtered — stay in cup. Simmer, do not boil.
☕ Percolator	1:16–1:20	Coarse	93°C	7–10 min	Easy to over-extract. Use coarser grind and shorter time than drip.

POUR OVER QUICK REFERENCE (1:15 RATIO)

Coffee	Water (ml)	Water (fl oz)	Cups (US)	Cups made
10g	150ml	5.07 fl oz	0.6	1 mug
12g	180ml	6.09 fl oz	0.8	1 mug
15g	225ml	7.61 fl oz	1	1 mug
18g	270ml	9.13 fl oz	1.1	1–2 mugs
20g	300ml	10.14 fl oz	1.3	1–2 mugs
22g	330ml	11.16 fl oz	1.4	1–2 mugs
25g	375ml	12.68 fl oz	1.6	1–2 mugs
28g	420ml	14.2 fl oz	1.8	1–2 mugs
30g	450ml	15.22 fl oz	1.9	1–2 mugs
35g	525ml	17.75 fl oz	2.2	2–3 mugs
40g	600ml	20.29 fl oz	2.5	2–3 mugs
50g	750ml	25.36 fl oz	3.2	3.2× mugs
60g	900ml	30.43 fl oz	3.8	3.8× mugs

FREQUENTLY ASKED QUESTIONS

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Coffee Ratio Calculator · Water = Coffee × Ratio · SCAA golden cup 1:17 · Espresso yield ratio 1:2 · 1 tbsp ground coffee ≈ 6g (medium grind)