If your coffee tastes too weak or too strong, the ratio is the first place to look. It's also one of the easiest things to fix. Get it sorted and every brew starts from solid ground.
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Start at about 1:16 by weight: divide your water weight by 16 to get the coffee dose (for example, 20 g of coffee to 320 g of water). For stronger coffee try 1:15; for lighter, try 1:17. Starting ratios vary a little by method, such as about 1:8 for cold brew concentrate. Weigh with a scale, then adjust grind or ratio one at a time.
Your cup of coffee is almost entirely water. The small amount of dissolved coffee in it is doing all the flavor work. Land the ratio in a sensible range and you've got something to build on. Miss by a lot and you get either sad, watery coffee or a heavy cup that flattens you.
And the math is the kind you can do half-awake.
The Starting Point: About 1:16 by Weight
A widely used starting point is one part coffee to about sixteen parts water, by weight. So 20 g of coffee goes with 320 g of water, and 25 g of coffee goes with 400 g.
Many guides call roughly 1:15 to 1:17 the "golden ratio," a range associated with the Specialty Coffee Association's brewing guidelines. It's where a lot of people find strength and sweetness in balance. Treat it as a starting point, not a law.
1:16 is a common place to start for pour over and drip, and a reasonable default for most other methods too. Tastes right? Keep it. Doesn't? Nudge it.
Adjusting the Ratio for Your Taste
Want it stronger? Try 1:15, or even 1:14. With 20 g of coffee, 1:14 means 280 g of water. Less water, bolder cup.
Want it lighter? Try 1:17. With 20 g of coffee, that's 340 g of water. More water, gentler cup.
That's really all there is to it. Brew, taste, and adjust tomorrow.
Ratio by Brewing Method
Each method keeps water and coffee together for a different amount of time and filters differently, so the usual starting ratios shift a little. Think of these as starting points, not fixed rules.
| Brewing Method | Common Starting Ratio | Why |
|---|---|---|
| Pour Over (V60, Melitta, Chemex) | 1:15 to 1:17 | Balanced extraction for a filtered cup |
| AeroPress | 1:12 to 1:15 (often diluted after) | Many recipes brew a concentrate, then top up with water |
| French Press | 1:15 to 1:16 | Full immersion with a coarse grind |
| Cold Brew Concentrate | About 1:8 | Makes a concentrate; dilute with water or milk to drink |
| Drip Coffee Maker | 1:16 to 1:17 | Similar to pour over |
Not sure? Use 1:16 and go from there.
Why Weight Beats Volume
A scoop of coffee isn't a fixed amount. What it weighs depends on grind size, roast level and how heavy-handed you are with the scoop. Same scoop, different weight, and your ratio wanders from one morning to the next.
A scale fixes that. Weigh the coffee in grams, weigh the water in grams (1 ml of water weighs about 1 g), and your ratio stays put.
Hario V60 Drip Scale (new model)
- 0.1 g steps from 2-200 g, then 0.5 g and 1 g steps up to 2,000 g max, per Hario
- Built-in timer
- Auto-off after 5 minutes, but not while the timer runs; uses 2 AAA batteries
A coffee scale with a built-in timer, like the Hario V60 Drip Scale, lets you track dose and brew time on one gadget. Set your brewer right on the scale and you can watch exactly how much water you've added as you pour.
Greater Goods Coffee Scale
- 0.1 g readability
- Count-up and count-down timer
- Silicone cover, 5.25-inch platform, 3 AAA batteries included
If you want a countdown timer as well as a count-up one, the Greater Goods coffee scale has both, according to its listing.
Practical Examples
For a 12 oz cup (about 350 g of water):
1:16: about 22 g coffee to 350 g water.
1:14 (stronger): about 25 g coffee to 350 g water.
1:17 (lighter): about 21 g coffee to 350 g water.
For 16 oz (about 475 g of water):
1:16: about 30 g coffee to 475 g water.
1:14 (stronger): about 34 g coffee to 475 g water.
1:17 (lighter): about 28 g coffee to 475 g water.
The formula is just division: water weight divided by the ratio number. For 1:16, divide the water by 16 and that's your coffee. For 1:14, divide by 14.
If You Don't Have a Scale
The old rule is about 2 tablespoons of ground coffee per 6 oz of water. It'll get you in the neighborhood, but it's inconsistent, because a tablespoon of coffee weighs different amounts depending on grind and roast. If you want the same cup twice, a scale is one of the most useful inexpensive upgrades you can make.
Ratio and Grind Size Work Together
Finer grounds give up their flavor faster; coarser grounds take their time. A useful way to split it: ratio controls strength (how concentrated the coffee is), and grind mostly controls extraction (how much flavor you pull out of the grounds).
Lock in the ratio first, then play with grind. Start at 1:16 with a grind that suits your method, and taste. Sour or thin (often a sign of under-extraction)? Grind finer. Bitter or harsh (often over-extraction)? Grind coarser. Tastes balanced but just too strong or too weak? That's when you change the ratio. One variable at a time, always.
Cold Brew Is Different
Cold brew concentrate often uses about 1:8, because there's no heat helping out; time does the work instead. For example, 100 g of coarse coffee to 800 g of water, steeped 12-24 hours, then strained.
Most people find the concentrate too strong to drink straight. Cut it about 1:1 with water and it lands near a 1:16 strength. That's the beauty of it: make one batch and pour from it all week. See our cold brew guide for the full method.
The Simple System
Weigh your water. Divide by 16. That's your coffee. Grind, brew, taste.
Want it stronger next time? Divide by 15. Lighter? Divide by 17.
It's one of the simplest things in coffee and one of the most important. Once it's consistent, every other tweak gets easier to judge.
One Number to Remember: 1:16. One part coffee to sixteen parts water by weight. Adjust from there.