For a first cold-drip batch, try a 1:12 ratio by weight: 30 g of coffee with 360 g of total brewing water. Use 40 g and 480 g only if both fit the brewer's stated limits.
Taste the finished coffee before deciding whether to dilute it. Beans, grind, drip rate and filtration all affect the result. Keep the first recipe consistent, then adjust one variable at a time.
What does a 1:12 cold drip ratio mean?
The arithmetic is one line:
coffee weight × ratio number = water weight
At 1:12, 35 g of coffee needs 420 g of water, because 35 × 12 = 420. For kitchen measurements, water is close to 1 g per milliliter. Weighing avoids the difficulty of reading volume markings through curved glass. A scale that reads to 0.1 g helps you measure coffee and water consistently.
| Coffee | Water at 1:10 | Water at 1:12 | Water at 1:14 |
|---|---|---|---|
| 25g | 250g | 300g | 350g |
| 30g | 300g | 360g | 420g |
| 35g | 350g | 420g | 490g |
| 40g | 400g | 480g | 560g |
At the same water amount, a smaller ratio number means more coffee. For example, 360 g of water uses 30 g at 1:12 and about 32.7 g at 1:11.
Count ice and liquid water together
Ice is water. If your brewer takes both, their combined weight is the recipe's water. For a 360 g total, load 180 g of ice and 180 g of cold water, or whatever split the brewer is designed around. Pour 360 g of water and then pile 150 g of ice on top and the total becomes 510 g. With 30 g of coffee, that changes the ratio from 1:12 to 1:17.
Keep the ice size and ice-to-water split similar while comparing ratios. Melt rate and room conditions can affect flow and timing.
A simple 1:12 cold drip recipe
The 600 ml glass cold drip coffee maker uses 1:12 as its starting ratio. Run this against your own brewer's capacity limits and assembly notes before scaling anything up.
Ingredients
- 40g freshly ground coffee
- 480g total ice and cold water
- Filter paper if required by the brewer
Method
- Grind medium to medium-coarse. Even particles matter more than matching a grinder number you read somewhere.
- Fit the lower filter and add 40 g of coffee to the basket.
- Level the bed with a tap or two. Do not tamp it. Add the top paper if your brewer uses one to spread the drops.
- Weigh out 480 g of ice and water together, staying under the upper chamber's marked limit.
- Open the valve to a slow, steady drip. On the 400 ml manual ice drip maker, that is around 7–8 drops every 10 seconds.
- Recheck the rate at five minutes, and again once the water level has dropped by half — less head pressure means a slower drip.
- Swirl the carafe before you taste. The first 50 g through the bed is far stronger than the last 50 g, and they do not mix on their own.
Taste a sample at a consistent serving temperature before adding more ice or water.
Why finished coffee weighs less than starting water
Expect less finished coffee than water loaded. Some liquid remains in the grounds and brewer, and any unmelted ice has not passed through the bed. Weigh the result instead of assuming a fixed loss.
This matters as soon as you brew for more than yourself. Weigh the yield once from a batch you liked — a scale with a timer under the carafe does it without extra effort — and plan servings from that number afterward. The ratio describes what goes in, not what comes out.
How to adjust the ratio by taste
Establish consistent flow before changing ratio. Check bed preparation if the cup is weak, and record Total brew time alongside the actual yield.
If the coffee tastes thin or disappears over ice
For more concentration, try 1:11 or 1:10 at the same water amount, within the basket limit. First check whether serving ice is diluting a batch that already tastes good.
If the coffee is too intense but otherwise clean
For a lighter serving, dilute a sample in the glass. If you prefer to change the brew, compare 1:13 or 1:14 next time.
If the coffee is bitter, harsh, or drying
Do not reach for less coffee first. Check the grind for fines, look at whether the drip stalled overnight, consider the roast, and rinse the filter properly — residue on a screen can affect the next batch's flavor. Several causes of bitterness in cold coffee have nothing to do with the ratio.
If the coffee tastes sour or hollow
Check whether the bed was wetted evenly. Correct visible bypass or dry areas before using more coffee to compensate for weak flavor.
Ratio, grind and drip rate do different jobs
Keep these three adjustments separate while testing:
- Ratio sets how much coffee is available for a given amount of water.
- Grind changes surface area, resistance, and how many fines reach the filter.
- Drip rate changes contact time and how evenly water moves through the bed.
Changing all three together makes it harder to identify which adjustment helped. Start at 1:12 with a medium-coarse grind and a flow you have recorded, then adjust whichever one connects to the fault you actually tasted.
Batch sizes for Yozcoffee cold drip brewers
The smaller 30 g/360 g recipe and larger 40 g/480 g recipe are options only where the coffee and water chambers accommodate them. Check the marked limits with ice included.
Treat those as working starting points rather than fill instructions. Respect the markings and the current product guide. Grounds and ice both displace volume, and two brewers with the same stated capacity rarely take the same load.
Frequently asked questions
Is 1:12 a concentrate?
There is no single ratio that defines concentrate here. Taste the finished coffee at the strength you plan to serve, then add water or milk if needed.
Can I measure coffee with a scoop?
You can use a scoop, but the weight it holds varies with the beans and grind. Use a consistent fill if you cannot weigh the dose. Any 0.1 g kitchen scale makes dose comparisons easier.
Should I include water used to pre-wet the grounds?
Yes. Every gram that touches the coffee bed counts toward the total. Subtract the pre-wet amount from what goes into the upper chamber so the ratio stays where you set it.
Does more coffee make the brew take longer?
It can. A changed dose changes the bed, so check the flow again rather than assuming the same valve position gives the same finish time.
Can I scale 1:12 to any brewer?
Keep the dose within the basket's intended range and the water below the fill limit. If the recipe does not fit, scale both quantities down together.
Start simple, then keep notes
Save the dose, total water, ice split and actual yield for the first batch. Those notes make the next ratio comparison easier.
