The 1:15 ratio is the strong end of normal. It is not a trick, not a fad, and not the same drink as a 1:16 pour-over with a longer brew. It is simply more coffee per millilitre of water, and that changes the cup in a specific, predictable way.
What 1:15 means in grams
Ratio is always coffee to water by weight. 1:15 means one gram of coffee for every fifteen grams of water.
| Cup | Coffee | Water | Approx. yield |
|---|---|---|---|
| Small, 200 ml | 13.3 g | 200 g | 170 ml |
| Standard, 250 ml | 16.7 g | 250 g | 215 ml |
| Mug, 350 ml | 23.3 g | 350 g | 300 ml |
| Two cups, 500 ml | 33.3 g | 500 g | 430 ml |
| Carafe, 750 ml | 50 g | 750 g | 645 ml |
Water retention is the number people forget. A paper filter holds roughly two grams of water for every gram of dry coffee, so a 16.7 g dose never yields 250 ml of drink. Plan around 85 percent recovery and you will stop wondering why your cup looks short.
What 1:15 tastes like next to 1:16 and 1:17
Same beans, same grinder, same water, only the ratio changed:
| Ratio | Dose for 250 g water | What changes in the cup |
|---|---|---|
| 1:14 | 17.9 g | Heavy body, dense sweetness, acidity pushed back |
| 1:15 | 16.7 g | Full body, round acidity, long finish |
| 1:16 | 15.6 g | The default. Balanced, more clarity, shorter finish |
| 1:17 | 14.7 g | Tea-like, acidity forward, thin body |
The shift is not "more coffee flavour". It is less water per gram, which means the same dissolved solids spread across a smaller volume, so the balance moves toward body and sweetness at the cost of the top-end aromatics.
Three cases where 1:15 beats 1:16
1. Dark roasts
Dark coffee is already soluble and already bitter-prone. A shorter ratio lets you use less water and finish the brew earlier, so you pull body and chocolate without dragging out the tail of the extraction where the ashy notes live. With a 1:17 ratio on a dark roast you usually end up waiting longer for the same grams, which is exactly backwards.
2. Iced V60
Brew 200 g of water at 1:15 over 60 g of ice and the melt brings the drinking strength to roughly 1:17.5. Brew at 1:17 over the same ice and you get a watery, acidic drink nobody finishes.
3. Cheap or stale beans
Older coffee has lost the volatile aromatics that make a light, high-clarity cup worth drinking. What is left is body and base sweetness. A tighter ratio leans into the part that survived instead of spotlighting the part that did not.
Where 1:15 fails
- Very light, high-grown washed coffees. These are the ones that repay dilution. At 1:15 the delicate florals get buried under body. Go 1:16.5 or 1:17 and grind slightly finer to keep extraction up.
- Small doses. Below about 12 g the bed gets shallow and the V60 starts bypassing. If you want a small strong cup, use a smaller dripper or accept a 1:16 cup instead.
- Fast filters in conical brewers. Less water means less contact time. Watch the clock: if a 1:15 brew finishes under 2:15, coarsen less and adjust grind carefully rather than pouring slower.
The grind correction nobody mentions
Going from 1:16 to 1:15 means roughly six percent less water per gram of coffee. Contact time drops with it. If you keep the grind identical, the cup often tastes under-extracted: sweet at the front, sour at the back, thin in the middle.
The standard fix is one or two clicks coarser, which restores flow so the brew time comes back up. The opposite instinct, grinding finer to "extract more", usually stalls the bed and gives you bitterness on top of sourness.
A 1:15 V60 recipe that works
| Step | Time | Action |
|---|---|---|
| Dose | — | 16.7 g, medium-fine |
| Bloom | 0:00 | 50 g water at 93 C, swirl, wait 45 s |
| Pour 2 | 0:45 | To 130 g, slow spiral from the centre out |
| Pour 3 | 1:15 | To 190 g |
| Pour 4 | 1:45 | To 250 g, one swirl |
| Drawdown | 2:15 to 2:45 | Should finish in this window |
Expect roughly 215 ml in the cup. If it tastes sour, grind finer in one-click steps before adding more coffee.
Ratio is not the first dial
Every ratio argument assumes the grind and the water are already right. They usually are not. If your 1:15 cup tastes bad, the most likely cause is grind or water, not the ratio, and the fix costs nothing but a click or two.