Brew, grind, water and roast toolkit
Coffee Calculators
Free specialty-coffee calculators for home baristas and roasters. Start with brew ratio and grind conversion, then open espresso dial-in, water recipes, roasting loss and the rest of the bar kit.
Brew ratios & dosing
Coffee-to-water ratios, espresso yield, cold brew dilution, flash brew and Americano balance.
Brew ratios & dosing
Americano & Long Black Calculator
Combine espresso yield and hot water into cup mass, espresso percent and dilution ratio. Americano is water then shot; long black is the reverse.
Brew ratios & dosing
Coffee to Water Ratio Calculator
Turn a brew ratio and coffee dose into water mass and cups for V60, Chemex, AeroPress, French press and espresso. Weigh both sides; scoops lie.
Brew ratios & dosing
Cold Brew Dilution Calculator
Dilute a cold-brew concentrate to a drinking brew ratio. Enter concentrate mass and the two ratios to get water to add and final drink mass.
Brew ratios & dosing
Espresso Dosing & Yield Calculator
Convert basket dose, brew ratio and shot time into beverage yield and flow rate. A 1:2 in 25–32 s is a starting point, not a religion.
Brew ratios & dosing
Iced Coffee Flash Brew Calculator
Split a target iced coffee into hot brew water and ice so the melt lands on your brew ratio. Enter dose, total beverage and ice mass.
Grind size & dialing in
Click conversion between grinders, espresso dial-in, TDS, extraction yield and burr life.
Grind size & dialing in
Espresso Dial-In Calculator
From dose, yield, time and a sour–bitter taste call, get a suggested yield, grind direction and a time hint. Taste first; the numbers follow.
Grind size & dialing in
Espresso Extraction Yield Calculator
Compute extraction yield and brew ratio from refractometer TDS, basket dose and beverage mass. EY% = TDS% × yield / dose.
Grind size & dialing in
Grind Size Converter
Convert grinder clicks between machines into estimated microns and whether that setting looks like espresso or filter. A map, not a laser diffraction lab.
Grind size & dialing in
Grinder Burr Lifespan Calculator
Estimate remaining burr life in kilograms and days from daily dose, rated life and kilograms already ground. A planning number, not a steel autopsy.
Grind size & dialing in
TDS Target Calculator
Work backwards from dose, beverage yield and a target extraction yield to the TDS your refractometer should read. Strength is not extraction.
Water chemistry
Barista water recipes, GH/KH, descaling intervals, acidity buffering and brew bypass.
Water chemistry
Barista Water Recipe Calculator
Build brewing water from target GH and KH as ppm CaCO₃. Get Epsom salt and baking soda in milligrams and grams for a chosen volume.
Water chemistry
Coffee Buffer & Acidity Calculator
Compare water KH to brew TDS for a simple buffer index and whether acidity is likely muted. Alkalinity fights acids; it does not erase roast.
Water chemistry
Descaling Frequency Calculator
Estimate days and shots until a descale from water hardness, daily shots and boiler volume. A maintenance schedule, not a plumber.
Water chemistry
Water Bypass Calculator
Add bypass water to a brewed batch to hit a lower target TDS. Beverage mass goes up; extraction yield of the grounds stays where it was.
Water chemistry
Water Hardness & Alkalinity Calculator
Convert GH and KH from ppm as CaCO₃ into German degrees and their ratio. Useful when a test kit and a coffee recipe disagree on units.
Coffee roasting
Weight loss, rate of rise, development time ratio, green density and degassing windows.
Coffee roasting
Bean Degassing Calculator
Estimate a peak flavour window from roast level and days since roast. Light roasts rest longer; dark roasts degas faster. A calendar, not a CO₂ meter.
Coffee roasting
Green Coffee Density Calculator
Estimate green bean bulk density from mass and displaced or poured volume. Density hints at heat uptake, not a lab true-density.
Coffee roasting
Roast Development Time Ratio Calculator
Compute development minutes and DTR percent from time to first crack and total roast time. A clock ratio, not a colour meter.
Coffee roasting
Roasting Rate of Rise Calculator
Compute rate of rise between two bean temperatures over a time interval. RoR is the slope, not a flavour name.
Coffee roasting
Roasting Weight Loss Calculator
Turn green and roasted mass into percent weight loss and yield. A crude roast level proxy: more loss usually means a darker roast.
Health, economics & lifestyle
Caffeine estimates, daily limits, cafe vs home ROI, cost per cup and batch scaling.
Health, economics & lifestyle
Batch Brew Scaler
Scale a working coffee recipe from one cup to a crowd. Keeps brew ratio; outputs new dose, water and the scale factor.
Health, economics & lifestyle
Caffeine Content Calculator
Estimate milligrams of caffeine from dry dose, arabica vs robusta, and brew method. An extraction sketch, not a lab assay or medical advice.
Health, economics & lifestyle
Cost per Cup Calculator
Price a cup from bean price per kilogram, dose, waste percent and extras like filters or milk. Currency in, currency out.
Health, economics & lifestyle
Daily Caffeine Limit Calculator
Sketch a daily caffeine milligram cap from body weight and pregnancy status using public-health style rules of thumb. Educational only.
Health, economics & lifestyle
Home Barista vs Café Calculator
See how many days until a home espresso setup beats café prices, plus yearly savings. Machine cost versus the gap per drink.
Advanced tools
Milk steaming, pump pressure and flow, thermal loss, siphon steep time and moka capacity.
Advanced tools
Espresso Pump Pressure & Flow Calculator
Sketch volumetric flow and a shot-time hint from pump pressure and dose. A toy hydraulic model, not a pressure-profiling lab.
Advanced tools
Milk Steaming Temperature Calculator
See the temperature rise from fridge milk to a target and whether you are likely past the protein sweet spot. A thermometer beats folklore.
Advanced tools
Moka Pot Capacity Calculator
Turn basket and boiler volumes plus a fill fraction into coffee dose, water mass and brew ratio for a stove-top moka pot.
Advanced tools
Siphon Steep Time Calculator
Estimate vacuum-pot steep time from grind and water temperature. A starting clock for the upper chamber, not a contest stopwatch.
Advanced tools
Thermal Loss Calculator
Estimate final water temperature after a hot pour into a cooler dripper or server, from masses and a vessel specific heat.
Clusters
- Brew ratios & dosingCoffee-to-water ratios, espresso yield, cold brew dilution, flash brew and Americano balance.
- Grind size & dialing inClick conversion between grinders, espresso dial-in, TDS, extraction yield and burr life.
- Water chemistryBarista water recipes, GH/KH, descaling intervals, acidity buffering and brew bypass.
- Coffee roastingWeight loss, rate of rise, development time ratio, green density and degassing windows.
- Health, economics & lifestyleCaffeine estimates, daily limits, cafe vs home ROI, cost per cup and batch scaling.
- Advanced toolsMilk steaming, pump pressure and flow, thermal loss, siphon steep time and moka capacity.