French Press Coffee Ratio: The Exact Grams-to-Water Formula
What Is the French Press Coffee-to-Water Ratio?
The French press coffee to water ratio is 1:15 by weight for a standard cup. That is 1 gram of coarse coffee for every 15 grams of water. Use 1:17 for a milder cup. SCA Standard 310-2021 sets its standard brew ratio at 55 grams of coffee per 1.000 kg of water. That works out to about 1:18.
Water weighs the same as its volume. So 600 ml of water is 600 g, and the sum is easy: divide the water in grams by your ratio.
Standard Ratios
The common home range is 1:15 to 1:17. Most Indian drinkers start at 1:15. A French press steeps the grounds in the water instead of dripping water through them. That full contact pulls more out of a coarse grind than a drip machine does.
Strong vs Mild Preference Ratios
- Mild (high clarity, lighter body): 1:17 to 1:18 (SCA Golden Cup standard, suits light roasts or single-origin).
- Average/balanced: 1:15 to 1:16 (robust flavor without bitterness).
- Strong (high body, robust): 1:12 to 1:13 to 1:15 (more coffee for intensity, prevents over-extraction in longer steeps).
Exact Grams for 1, 2, 4 Cups (Metric, Assuming 1 Cup = 150-250ml Brewed Coffee Volume)
Use a kitchen scale. 1 ml of water weighs about 1 g, so you can read the water off the carafe markings. The three sizes in bold are the InstaCuppa French Press sizes.
| Water in the press | Cups (150 ml each) | Coffee at 1:15 (strong) | Coffee at 1:16.7 (balanced) | Coffee at 1:18 (SCA test ratio) |
|---|---|---|---|---|
| 250 ml | about 1 | 17 g | 15 g | 14 g |
| 350 ml | about 2 | 23 g | 21 g | 19 g |
| 500 ml | about 3 | 33 g | 30 g | 28 g |
| 600 ml | about 4 | 40 g | 36 g | 33 g |
| 1000 ml | about 6 | 67 g | 60 g | 56 g |
Two published recipes sit inside this range. James Hoffmann’s French press method uses 30 g of coffee to 500 ml of water, which is 1:16.7. SCA Standard 310-2021 tests at 55 g per litre, which is 1:18. Anything between the two will taste good.
How Ratio Affects Taste
- Lower ratio (e.g., 1:12-1:15, more coffee): Increases body and strength, extracts more solubles for richer, fuller mouthfeel; risks bitterness if over-extracted.
- Higher ratio (e.g., 1:17-1:18, less coffee): Boosts clarity and acidity, lighter body; may taste weak or sour if under-extracted.
Adjust by adding hot water post-brew to dilute strong brews without changing extraction.
The InstaCuppa French Press comes in 350 ml, 600 ml and 1000 ml. Prices are Rs 1,399, Rs 1,599 and Rs 1,999 as of 25 September 2026. The glass carafe carries water level markings and a 4-part filter, so you can measure the water without a separate jug.
- SCA Standard 310-2021, Home Coffee Brewers: Specifications and Test Methods — “Standard brew ratio. The brew ratio used for testing in this standard: 55 g of coffee per 1.000 kg of water.”
- James Hoffmann French Press Method — 30 g coffee, 500 ml water, ratio 1:16.7, 96 °C.
- InstaCuppa French Press Coffee Maker — 350 ml, 600 ml and 1000 ml sizes and current prices, checked 25 September 2026.
Frequently Asked Questions
What is the standard French press ratio?
SCA Standard 310-2021 sets the standard brew ratio at 55 grams of coffee per 1.000 kg of water, which is about 1:18. Most home drinkers in India want a stronger cup, so the usual home range is 1:15 to 1:17. Start with 1:15 and adjust to your taste.
How many grams of coffee for a 600ml French press?
For a 600 ml French press at 1:15 you need 40 g of coarse ground coffee. At 1:17 you need 35 g. Fill the water to the top marking on the carafe, not to the rim. The plunger takes up room, so a 600 ml press holds a little less than 600 ml once it is closed.
How do I make French press coffee stronger without making it bitter?
Increase the coffee amount (try 1:12 ratio) rather than steeping longer. More coffee with the same 4-minute steep extracts more flavor without the bitterness that comes from over-extraction. You can also try a slightly finer grind (medium instead of coarse) but keep the steep time at 4 minutes.
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