Using a scale is the simplest way to make your coffee recipe repeatable. Weigh your dry coffee, choose a starting ratio, calculate the target water weight, and then adjust one variable at a time after tasting. The method works with any scale that reads in grams, and the product-specific steps below also cover the Brewista Ratio Scale BWRRS1.
Quick Answer
Place your brewer on a stable scale, tare it, add a measured coffee dose, and multiply that dose by your chosen ratio to find the target water weight. Start near 1:16 for filter coffee, brew, taste, and change the ratio in small steps while keeping the grind, water, and brew time consistent.
Key Takeaways
At a Glance
| Time Required | About 5–10 minutes for most hot filter methods |
| Difficulty | Easy |
| Tools Needed | Gram scale, brewer, coffee, water, grinder, filter if required, and kettle |
| Cost | No added cost if you already own a brewer and scale; equipment prices vary |
A coffee-to-water ratio compares the weight of dry coffee with the weight of water used for brewing. A 1:16 ratio means that you use 16 grams of water for every 1 gram of coffee. For example, 20 grams of coffee at 1:16 requires 320 grams of brewing water.
The ratio has a direct effect on beverage strength. Using more water with the same coffee dose usually produces a less concentrated drink, while using less water usually produces a stronger one. However, ratio alone does not determine whether the coffee is properly extracted. Grind size, contact time, agitation, brewer design, water, roast, and pouring technique also shape the result.
A widely used filter-coffee starting point is 60 grams of coffee per liter of brewing water, which equals approximately 1:16.7.
The Specialty Coffee Association uses 60 grams per liter as a common way to express a filter-coffee brewing ratio. It is a starting reference rather than a rule that every coffee drinker must follow.
Note: Filter and immersion recipes normally compare brewing-water input with dry coffee. Espresso recipes usually compare the weight of the finished beverage with the dry coffee dose. Therefore, a 1:2 espresso ratio does not mean pouring only two grams of water for every gram of coffee.
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You do not need an automatic ratio scale to make an accurate recipe. Use this formula:
Coffee dose × ratio number = target water weight
For example:
Round the target to the nearest gram for normal home brewing. A difference of a fraction of a gram in the water target is unlikely to matter as much as consistent grinding and pouring.
| Ratio | Coffee | Target Water |
|---|---|---|
| 1:14 | 15 g | 210 g |
| 1:15 | 15 g | 225 g |
| 1:16 | 15 g | 240 g |
| 1:17 | 15 g | 255 g |
| 1:18 | 15 g | 270 g |
| 1:19 | 15 g | 285 g |
| 1:20 | 15 g | 300 g |
The finished drink usually weighs less than the water you added because the grounds and filter retain some liquid. For filter coffee, use the input-water target when following a ratio recipe unless the recipe specifically says otherwise.
Pro Tip: Change only one major variable between brews. If you alter the ratio, grind, water temperature, and pouring pattern at the same time, you will not know which change improved or harmed the cup.
The Brewista Ratio Scale includes a ratio calculator, automatic and manual operating modes, a timer, visual target-rate bars, a rechargeable battery, and a water-resistant design. The controls below apply to model BWRRS1 as described in the manufacturer’s Ratio Scale manual.
Choose the ratio before brewing begins. The setting cannot be changed during an active brewing process.
Automatic mode removes the need to calculate the target manually and helps you repeat the same workflow. It does not guarantee proper extraction, so you must still control the grind, water, timing, and pouring technique.
Manual mode is helpful when you want direct control over taring and timer activation or when an unusual brewing sequence would trigger automatic mode at the wrong moment.
Warning: Hot water can cause burns. Keep the brewer stable and avoid pouring beyond its capacity. The Brewista scale is water-resistant, not waterproof; wipe spills promptly and never immerse the scale or charging port in water.
Start with a balanced reference recipe and make small changes. Moving from 1:16 to 1:15 creates a more concentrated drink because you are using less water for the same coffee dose. Moving from 1:16 to 1:17 creates a less concentrated drink.
| What You Taste | Likely Issue | First Adjustment |
|---|---|---|
| Balanced but too strong or heavy | The beverage is more concentrated than you prefer | Use a higher ratio, such as moving from 1:16 to 1:17 |
| Balanced but too weak or thin | The beverage is less concentrated than you prefer | Use a lower ratio, such as moving from 1:16 to 1:15 |
| Sharp, sour, or hollow | Possible under-extraction or uneven extraction | Keep the ratio fixed and try a slightly finer grind or longer contact time |
| Dry, harsh, or unpleasantly bitter | Possible over-extraction, channeling, or excessive contact time | Keep the ratio fixed and try a slightly coarser grind or shorter contact time |
| Inconsistent from brew to brew | Changing dose, pouring, grind, or timing | Write down the full recipe and repeat the same process before adjusting |
Strength and extraction are related but not identical. If the coffee tastes balanced and simply feels too strong or weak, change the ratio. If it tastes sharply sour, dry, harsh, or uneven, keep the ratio steady while you correct grind and contact time first.
No single ratio is ideal for every coffee or brewer. The following numbers are practical starting points that you can adjust after tasting.
| Brew Method | Starting Ratio | What the Ratio Measures | Brewista Preset Use |
|---|---|---|---|
| Pour-over or drip | About 1:15 to 1:17 | Brewing-water input to dry coffee | Yes |
| French press | About 1:15 to 1:17 | Brewing-water input to dry coffee | Yes, when weighing the added water |
| Espresso | About 1:2 as a starting point | Finished beverage output to dry coffee dose | No; weigh manually |
| Toddy-style cold-brew concentrate | Approximately 1:5.5 | Brewing-water input to dry coffee before dilution | No; calculate manually |
A recipe on the Hario USA V60 recipe page uses 15 grams of coffee with 250 milliliters of water, which is approximately 1:16.7. For cold-brew concentrate, the Toddy Home System guide uses 340 grams of coffee with 1.9 liters of water and then recommends diluting the resulting concentrate to taste.
Because the Brewista BWRRS1 presets are designed around filter-style ratios, use its normal weighing functions rather than its preset calculator for espresso or strong cold-brew concentrate.
Move the scale to a level, solid surface. Keep it away from fans, open windows, vibrating appliances, and anything touching the platform or brewer. Verify that the kettle, filter, or dripper is not resting against another object.
Remove all weight, restart the scale, and wait for the display to settle. Place the empty brewing setup on the platform and press the zero or tare button. If the reading still appears wrong, test the scale with a reliable known weight.
Confirm that the Brewista scale is in automatic mode before placing the brewer on it. The operating mode cannot be changed after weight is added or after brewing starts. Remove the brewer, select automatic mode, and begin again.
Make sure automatic mode is active, the brewer has completed auto-taring, the coffee dose has been added, and the Ratio button has been pressed. The timer starts when the scale detects water being poured. In manual mode, you must press the Timer button yourself.
Stop the current brewing process and remove all weight. Hold the Ratio button for three seconds, select the new preset, and wait three seconds for the setting to save. The preset cannot be changed during brewing.
Check that you did not include the brewer or filter weight as part of the coffee dose. Tare the brewing vessel before adding coffee. Also verify that the selected ratio is correct. For example, 20 grams of coffee at 1:16 should produce a 320-gram target.
Recharge the battery if the battery indicator is low. On the BWRRS1, the auto-off interval can also be adjusted. Choose a setting long enough for your brewing method, or disable auto-off when the manual permits it, and remember to switch the scale off afterward.
Do not calibrate the scale before every brew. Taring is the normal daily step. Consider calibration only if a known test weight reads incorrectly, the scale has suffered a hard impact, or the manufacturer’s troubleshooting instructions direct you to calibrate it. The BWRRS1 calibration procedure requires a 500-gram calibration weight, so follow its manual exactly.
Wipe coffee, water, and oils from the surface with a soft damp cloth, then dry the exterior. Remove and wash a detachable silicone pad separately when needed. Do not submerge the scale, soak the charging port, use abrasive cleaners, or press hard on the platform.
There is no universal ideal. Start near 1:15 to 1:17 for pour-over, drip, or French press. Espresso commonly starts near a 1:2 beverage-output ratio. Concentrated cold-brew recipes use much less water and should be diluted before serving. Adjust every starting point according to the coffee, equipment, and your taste.
Keep the beans in an opaque, airtight container in a cool, dark location away from heat, moisture, and strong odors. Buy amounts you can use reasonably soon and grind only what you need before brewing. The National Coffee Association recommends avoiding warm cabinets near ovens, dishwashers, or direct sun.
Grind size does not change the mathematical ratio, but it changes how quickly water extracts compounds from the grounds. In pour-over coffee, it also changes flow resistance and brew time. Keep the ratio fixed while adjusting the grind so you can judge the effect of each change clearly.
Yes. A kitchen scale works if it reads in grams, responds quickly enough while you pour, supports the total weight of the brewer, and does not shut off during the process. A scale that reads to 0.1 gram is especially useful for small coffee doses, while a built-in timer and ratio calculator are convenient rather than essential.
Wipe water and coffee from the scale whenever a spill occurs. If you brew daily, clean the surface and removable pad regularly enough to prevent oil and residue buildup. Use a soft damp cloth and follow the manufacturer’s care instructions. Never submerge a scale unless its documentation explicitly says it is waterproof.
Coffee grounds and filters retain part of the brewing water, and a small amount may evaporate. For pour-over and drip recipes, the ratio normally refers to the water added rather than the final beverage weight. Espresso is different because its ratio usually compares dry coffee dose with beverage output.
Change the ratio when the coffee tastes balanced but is stronger or weaker than you prefer. Change the grind when the flavor seems sour, hollow, dry, harsh, or uneven. Keep all other major variables steady and make one small adjustment at a time.
Its documented presets are suited to filter-style ratios from 1:14 through 1:20. Espresso and concentrated cold-brew recipes fall outside that range and use different measurement conventions. Use the scale’s normal weighing and timer functions and calculate those targets manually.
Dialing in a coffee-to-water ratio is less about finding one perfect number and more about creating a controlled, repeatable recipe. Start with a sensible ratio, calculate the exact water target, tare your scale, and record the result. If the coffee is balanced but too strong or weak, adjust the ratio. If it tastes sour, harsh, or uneven, keep the ratio steady while you refine the grind and brew time.
A specialized ratio scale can make the calculations and pouring process easier, but an ordinary gram scale can produce equally repeatable measurements when you use the formula correctly. Consistency gives you the freedom to experiment because you can identify exactly which change improved the cup.
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