Reviewed 29 July 2026 · Beginner guide · No sponsorship or affiliate links.
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The short answer
For drip coffee, a useful starting point is 1 gram of coffee to 16 grams of water. In practice, that means 15 g of coffee with 240 g of water. If the cup ends up too strong or too light, adjust the water by 10–20 g, or the coffee by about 1 g. If the sourness or bitterness feels sharp, it is also worth checking grind size and brew time.
In 30 seconds
- Start with a 1:16 coffee-to-water ratio: 15 g coffee and 240 g water.
- Change only a small amount of coffee or water between brews.
- Ratio controls concentration, but it does not solve every extraction problem.
What does 1:16 mean?
A ratio is really just a repeatable way of writing down a recipe. At 1:16, every gram of coffee is matched with 16 grams of brewing water:
- 15 g coffee + 240 g water
- 18 g coffee + 288 g water
- 20 g coffee + 320 g water
Measuring water in grams is especially convenient, since 1 millilitre of ordinary brewing water is close to 1 gram for practical home use. Place the brewer on a scale, tare it, then simply follow the water weight as you pour.
Is 1:16 an official standard?
No. It is a memorable, moderately strong starting point, not a promise of quality, and not an official SCA standard. The Specialty Coffee Association’s Certified Home Brewer test starts at 55 grams per litre, about 1:18.2. SCA educational material also uses 60 grams per litre, about 1:16.7, as a common notation example. MELB NOTE’s 1:16 starting point equals 62.5 grams per litre.
All of these figures sit within a useful filter-coffee neighbourhood. Your coffee, your brewer and your own preference are what settle the final ratio.
How to adjust a cup that is too strong or too light
If the flavour itself seems balanced but the cup feels too concentrated, try a little more water. If it feels too light, use less water or slightly more coffee. Change only 10–20 g of water, or about 1 g of coffee, at a time, so you can still compare the result clearly.
- Too strong but pleasant: add a little more water next time.
- Too light but pleasant: reduce the water slightly.
- Sharply sour or hollow: check whether the grind is too coarse or the brew too fast.
- Bitter, dry or harsh: check whether the grind is too fine or the brew too slow.
Go deeper: strength and extraction are different
Strength describes how concentrated the finished drink is. Extraction describes how much soluble material water removed from the coffee. A cup can be strong yet poorly extracted, or light yet balanced. Changing the ratio mainly changes strength; grind, time, temperature and flow also shape extraction.
What if you do not own a scale?
You can start with a measuring spoon and a marked cup, but coffee beans vary in size and roast level, so they do not always weigh the same by volume. A small kitchen scale is one of the simplest ways to repeat a recipe once home brewing becomes a regular habit.
Find your own repeatable ratio
- Brew one cup with 15 g of coffee and 240 g of water.
- Describe it with one word: strong, light, sour, bitter or comfortable.
- For the next cup, change either 10–20 g of water or 1 g of coffee—never both.
The best ratio is not the number printed on a chart. It is a clear starting point that helps you make a cup you enjoy again.
Frequently asked questions
Is 1:16 the correct ratio?
It is one practical starting point within a common filter-coffee range. Different coffees, brewers and preferences may work better with a stronger or lighter ratio.
Does using more water always increase extraction?
More brewing water can also change contact time and flow, so it may affect both concentration and extraction. Record drawdown time and flavour when you change the ratio.
Can I measure the ratio without a scale?
Yes, as an approximate start. A spoon and marked cup work, but coffee volume varies. A scale improves repeatability if you brew often.
Sources and scope
- Specialty Coffee Association — Certified Home Brewer Program Requirements
- Specialty Coffee Association — Water and Coffee Acidity
The 1:16 ratio in this guide is a MELB NOTE beginner starting point, not an official SCA standard or a guarantee of flavour. Reviewed 29 July 2026.
