Brewing · Water Chemistry
Dial in your brewing water minerals. Enter your source water, pick a target profile, and get exact salt additions for any batch size.
Balanced profile adjusted for a hoppy IPA:
Live calculator · updates as you adjust
Salt additions for 20 L
Resulting water profile
Sulfate-to-chloride ratio
| Profile | Ca | Mg | Na | SO4 | Cl | HCO3 | Best for |
|---|---|---|---|---|---|---|---|
| Balanced | 80 | 5 | 15 | 80 | 75 | 100 | Ales, lagers, general purpose |
| Hoppy / IPA | 100 | 10 | 15 | 200 | 50 | 50 | IPAs, pale ales, hop-forward styles |
| Malty / Amber | 75 | 10 | 15 | 50 | 120 | 100 | Amber ales, brown ales, malt-forward |
| Pilsner | 10 | 3 | 2 | 5 | 5 | 15 | Pilsners, light lagers, delicate styles |
| Stout | 100 | 15 | 50 | 50 | 75 | 200 | Stouts, porters, dark ales |
Water chemistry is one of the most impactful yet often overlooked variables in brewing. The mineral content of your water affects enzyme activity during the mash, hop perception, mouthfeel, and overall flavor balance. The sulfate-to-chloride ratio is a key lever — higher sulfate accentuates hop bitterness and a dry finish, while higher chloride enhances malt sweetness and body. Start with a known water source such as a local water report or RO/distilled water, target the profile for your beer style, and add brewing salts to your water before the mash. Always use non-iodized salt for brewing additions.
Water chemistry guide
Water is the largest ingredient in beer. Adjusting its mineral content is one of the simplest ways to elevate your brewing from good to exceptional.
The recommended minimum calcium level for healthy yeast and clear beer.
Sulfate-to-chloride ratio that emphasises hop bitterness and a dry finish.
Gypsum, CaCl2, Epsom salt, table salt, and chalk cover nearly any water target.
Enter your batch volume and your current water mineral levels (from a water report or test kit). Select a target profile or set custom targets for calcium, sulfate, chloride, magnesium, and sodium. The calculator shows exactly how many grams of each brewing salt to add.
If you are starting from RO or distilled water, leave all baseline values at zero. The calculator will build the entire mineral profile from scratch using the most efficient salt combinations.
The minerals dissolved in your brewing water shape every aspect of the finished beer. Calcium supports enzyme activity in the mash, promotes yeast health, and helps proteins coagulate for clearer beer. It is the single most important mineral for brewers.
Sulfate sharpens hop bitterness and gives a dry, crisp finish. Chloride rounds out malt character and adds body. The balance between these two ions is one of the most powerful stylistic levers a brewer can pull.
These profiles represent proven starting points for popular beer styles. Adjust to taste after your first batch.
Gypsum (CaSO4) raises both calcium and sulfate. It is the primary salt for pushing water toward a hoppy profile. Calcium chloride (CaCl2) raises calcium and chloride, steering the profile malt-forward.
Epsom salt (MgSO4) adds magnesium and sulfate. Use it sparingly — magnesium above 30 ppm can produce a bitter, astringent flavour. Table salt (NaCl, non-iodized) raises sodium and chloride and is useful for rounding out flavour at low levels. Chalk (CaCO3) raises calcium and alkalinity but dissolves poorly; it is mainly used for very dark beers that need higher mash pH.
The easiest path for beginners is to buy RO water from a grocery store and build up from zero. This eliminates variables from your tap water and gives you repeatable results. Five gallons of RO water typically costs under two dollars.
Invest in a small digital scale that reads to 0.1 grams — brewing salt additions are often in the 1–5 gram range, so a kitchen scale that reads only whole grams is not precise enough. Add salts to your strike water before mashing and stir until fully dissolved.
Common questions about adjusting brewing water for better beer.
Water makes up over 90% of beer. Its mineral content affects mash pH, enzyme activity, hop perception, and mouthfeel. Sulfate accentuates hop bitterness and dryness, while chloride enhances malt sweetness and body. Matching your water to the style you are brewing can dramatically improve the finished beer.
The sulfate-to-chloride ratio determines whether a beer leans hoppy-dry or malt-forward. A ratio above 2:1 emphasises hops and crispness, typical for IPAs. A ratio below 1:1 highlights malt and roundness, suited for stouts and amber ales. A balanced 1:1 ratio works well for most pale ales and lagers.
If you are new to water adjustment, start by building up from reverse-osmosis (RO) or distilled water. This gives you a blank slate. Add minerals to match a classic profile like "Balanced" (75 ppm Ca, 60 ppm SO4, 70 ppm Cl) and adjust from there based on the style and your taste preferences.
One gram of gypsum (calcium sulfate) per gallon of water adds approximately 62 ppm calcium and 148 ppm sulfate. To raise sulfate by 100 ppm in 5 gallons, you need roughly 3.4 grams. This calculator handles the arithmetic automatically for your batch volume.
Yes, if you know your tap water mineral content. Request a water report from your utility or use a home test kit. Enter the baseline numbers into this calculator and it will tell you how much of each salt to add (or whether you need to dilute with RO water to reduce existing minerals).
The five common brewing salts are gypsum (calcium sulfate), calcium chloride, Epsom salt (magnesium sulfate), table salt (sodium chloride, non-iodized), and chalk (calcium carbonate). Each raises different mineral ions, so combinations let you fine-tune your water profile to any target.