BREWKIND / 04
Coffee dilution
Use a measured starting TDS and a target TDS to calculate how much water to add.
Coffee dilution
Use a measured starting TDS and a target TDS to calculate how much water to add.
The default 1.8% is a worked example, not a measured or predicted strength of your coffee. Target TDS must be above zero and no higher than the starting TDS.
Only this button saves to localStorage. Maximum 10 recipes, shared by both languages.
Water to add
Use a measured starting TDS, not one guessed from brew ratio. All quantities are masses. This assumes no losses and negligible coffee solids in added water.
The calculation
Dissolved coffee solids = starting coffee mass × starting TDS ÷ 100. Final mass = starting mass × starting TDS ÷ target TDS. Added water = final mass − starting mass. This is a mass balance assuming complete mixing, no losses, and added water with negligible coffee solids.
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Save a recipe when it is ready. It will stay in this browser; export JSON or CSV for your own backup.
Bring a measured coffee down in strength
A 250 g coffee at measured 1.8% TDS contains 4.5 g of dissolved coffee solids. To reach 1.35%, the final mass is 333.33 g: add 83.33 g water, assuming the added water contributes negligible coffee solids.
How it works ↗Four ways to make the numbers clear.
Coffee-to-water ratio
Choose a coffee-to-input-water ratio and calculate in either direction, using grams throughout.
Open tool↗Batch brew planner
Scale your brewing water for a shared pot and split it into a pour-by-pour plan.
Open tool↗Espresso ratio
Calculate dry coffee dose, beverage yield or their ratio. Keep shot time with your recipe.
Open tool↗A few useful answers
Understand the numbers. Keep your own taste.
Will this tell me the best ratio?＋
No. Ratios, pour splits and times are user choices. The presets are editable examples, not universal recipes or a promise of extraction or flavor. Adjust to your coffee, grinder and brewer.
Does 600 g of brewing water make 600 g of coffee?＋
Not necessarily. Grounds retain water, and evaporation and equipment also affect the collected drink. The batch planner scales input water and does not predict final beverage volume.
Can I estimate TDS from the brew ratio?＋
Brew ratio alone does not provide measured strength. Use an appropriate coffee refractometer and its measurement procedure for a real TDS result. The dilution example is illustrative.
Where are my saved recipes?＋
Only in localStorage for this site in this browser. Saving is optional and happens when you press Save recipe. There is no cloud sync. Export a backup before clearing browser data.