Coffee Brewing Calculators
A small, sharp set of brewing tools for people who weigh their coffee. Pick a ratio, measure your extraction, plot it on the SCA control chart, dial in espresso, or batch a cold-brew concentrate — each calculator is sourced, tested and built to read at a glance. No login, no fluff: just the numbers, then taste and adjust.
The brewing workflow
These tools follow the path of a brew — from choosing a ratio to fixing the taste in the cup. Start anywhere; each step links to the next.
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Set your ratio
Grams of coffee for your water — the backbone of every brew.
Coffee to Water Ratio Calculator → - 2
Measure strength
Turn a refractometer reading into extraction yield and a Golden Cup verdict.
Coffee Extraction Yield & Strength Calculator → - 3
Plot the chart
See where your recipe lands on the SCA Brewing Control Chart — no refractometer needed.
Coffee Brewing Control Chart Calculator → - 4
Dial in espresso
Dose, ratio and shot time, with sour-vs-bitter troubleshooting.
Espresso Ratio & Dial-In Calculator → - 5
Batch cold brew
Size a concentrate, then dilute it to a drinkable strength.
Cold Brew Coffee Ratio & Dilution Calculator →
All coffee calculators
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Coffee to Water Ratio Calculator
How many grams of coffee for your water or cups, using the SCA golden ratio, with presets per brew method.
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Coffee Extraction Yield & Strength Calculator
Turn a refractometer TDS reading into extraction yield and strength, plotted on the SCA Brewing Control Chart with a sour/bitter verdict.
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Coffee Brewing Control Chart Calculator
Plot your brew ratio on the SCA Brewing Control Chart without a refractometer — estimate strength and extraction and see if you hit the Golden Cup.
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Espresso Ratio & Dial-In Calculator
Dose, ratio and yield for espresso — ristretto, normale or lungo — with a 25–30 s shot-time check and sour-vs-bitter dial-in advice.
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Cold Brew Coffee Ratio & Dilution Calculator
Coffee and water for cold brew concentrate (1:4–1:6), the yield after the grounds soak, and exactly how much water to add to dilute to taste.
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Coffee Recipe & Ratio Scaler
Scale a pour-over recipe to any number of cups while keeping the same coffee-to-water ratio, with a bloom and pour schedule plus the Tetsu 4:6 split.
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Brew-by-Method Coffee Ratio & Temperature Calculator
Pick a brew method — V60, Chemex, French press, AeroPress, moka, Turkish — and get its coffee-to-water ratio, water temperature and grind for your cups.
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Coffee Grind Size Guide & Chart Calculator
See the indicative grind micron range and coarseness for espresso, pour over, French press, cold brew and more — plus rough grinder clicks. Dial in by taste.
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Daily Caffeine Calculator
Add up the caffeine in your day's coffee, tea and energy drinks and compare it to the 400 mg adult or 200 mg pregnancy daily limit.
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Coffee Cost Per Cup Calculator
Calculate your real coffee cost per cup from bag price and dose, compare to the café, and see annual savings and when a machine pays for itself. Free.
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Brewing Water Recipe Calculator (SCA + DIY)
Build coffee water from distilled/RO plus Epsom salt (GH) and baking soda (KH) to hit SCA targets. Get grams per batch and an easy stock concentrate.
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Coffee Roast Weight-Loss Calculator
Convert green coffee weight to roasted weight by roast level (light to dark), find weight lost, or weigh your batch for the real roast loss %.
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How we get the numbers
Every tool uses published brewing science: the SCA Golden Cup bands (18–22% extraction × 1.15–1.35% strength), the extraction-yield formula (TDS% × beverage ÷ dose), and the espresso and cold-brew ratios baristas actually use. Figures are starting points, not rules — beans, roast, grinder and water all shift the target, so the last step is always to taste and adjust.