⚙︎ Tools · for coffee nerds
Brew smarter,
not harder.
Nine interactive utilities for dialing in your cup — real recipes from Hoffmann, Kasuya, and Rao; the SCA Brewing Control Chart and Golden Cup math; water-quality diagnostics; and an interactive flavor wheel. Sources cited inside each tool.
Brew Ratio Calculator
Real recipes from named experts — Hoffmann V60, Kasuya 4:6, Rao Spin, Hoffmann French Press. Set dose, get grams + pour schedule + bloom timer.
Brew Ratio Calculator
Real recipes from named experts. Pick a method, set your dose, get the grams and the pour schedule.
percolation
immersion
espresso
Adjusts ratio by ±0.5 around the recipe baseline (1:16.7).
Coffee
30g
Water
500.1g
Ratio
1:16.7
Temp
93°C / 199°F
Grind
Medium-fine · Comandante ~25 clicks
Time
3:30
Pour schedule
- 0s
Bloom · 60g
Pour 2× coffee weight. Swirl.
- 45s
Pour 1 · 300g
Up to 60% by 1:15. Steady spiral.
- 1:15
Pour 2 · 500g
Up to 100% by 1:45. Stir gently, swirl bed flat.
- 3:30
Drawdown · 500g
Drains by 3:30. Pull when dry.
Hoffmann's reference V60 recipe. Forgiving, clean, repeatable. Adjust grind first if it's drawing too fast or too slow.
Grind Size Guide
Microns, physical references (kosher salt, beach sand, sea salt flakes), and per-grinder dials for six popular grinders.
Grind Size Guide
Microns, physical references, and per-grinder settings — speaks both no-grinder novice and gearhead.
Microns
600–900
µm typical
Feels like
Kosher salt
Test on your fingertip
Grinder settings
Comandante C40
20–25
clicks
1Zpresso JX-Pro
8–10
internal
Baratza Encore
18–22
1–40
Fellow Ode Gen 2
5–7
1–11
Niche Zero
28–32
0–50
Mahlkönig EK43
8–10
0–11
Approximate — each grinder unit has slight burr-alignment variance. Use as a starting point, dial from there.
Too sour or weak? Finer (more extraction). Too bitter or harsh? Coarser (less extraction).
Brew Troubleshooter
Two questions about what you tasted → mapped to the Brewing Control Chart → which knob to turn. Strength vs extraction, the right way to think about it.
Brew Troubleshooter
Two questions about what you tasted. We map it to the Brewing Control Chart and tell you which knob to turn.
Brewing Control Chart
Extraction / TDS Calculator
Refractometer reading + dose + beverage weight → extraction yield %, plotted on the SCA Golden Cup chart with a specific verdict.
Extraction / TDS Calculator
Plug in a refractometer reading + dose + beverage weight. Tells you exactly which box you're in on the SCA Golden Cup chart.
g coffee
g brewed
Strength
1.25%
TDS
Extraction
18.8%
EY
Brewing Control Chart
SCA Golden Cup
Ideal
You're inside the SCA Golden Cup box. Sweet, balanced, properly developed. Don't change anything.
- →Lock this recipe in. Same bean, same grinder, same scale.
Water Quality Calculator
Punch in your tap water's TDS / hardness / alkalinity. Compare to SCA targets, get a fix path — pitcher filter, Third Wave Water, or DIY mineral recipe.
Water Quality Calculator
Punch in your tap water numbers (TDS pen / city water report). We'll tell you whether it's brew-ready and what to do if not.
mg/L
ppm CaCO₃
ppm CaCO₃
TDS
180 mg/LCalcium hardness
80 ppm CaCO₃Alkalinity
50 ppm CaCO₃Use your tap water as-is
Run it through a basic carbon filter for chlorine, then go. You're in spec.
TDS: Within SCA acceptable range.
Calcium hardness: Within SCA acceptable range.
Alkalinity: Within SCA acceptable range.
Roast Date Freshness
Pick the date stamped on your bag. See where you are on the degas curve and how to brew at each stage — peak window, fading, past prime.
Roast Date Freshness
Pick the date stamped on your bag. We'll tell you where it falls on the degas curve and how to brew it.
Peak window
12 days past roast
The whole reason single-batch roasters exist. Aromatics fully expressed, cup is sweet and balanced. Our take: a well-stored bag stays in the peak window for roughly four weeks — through day 28 you're still tasting what the roaster intended.
Degas curve
day 0 → 70+
Cost Calculator
Real cost per cup at home vs your favorite cafe. The math is brutal — but it's good for you.
Cost Calculator
Real cost per cup, real monthly + annual numbers, and how long good gear takes to pay itself off.
g coffee
Per cup
$1.00
Per month
$60
Per year
$730
Monthly habit cost
Brewing at home saves $270/mo (~82%) · $3240/year
Gear payback
at your monthly savings
Brewing scale (Acaia Pearl)
$165
<1 mo
payback
Comandante C40 (hand grinder)
$270
1.0 mo
payback
Fellow Ode Gen 2 (electric, filter)
$345
1.3 mo
payback
Niche Zero (electric, all-arounder)
$700
2.6 mo
payback
Fellow Stagg EKG (variable-temp kettle)
$195
<1 mo
payback
VST LAB Coffee III refractometer
$525
1.9 mo
payback
Coffee Compass
Plot extraction × strength to navigate where your cup actually is — and which knob to turn next.
Coffee Compass
Visual map of Lockhart's Brewing Control Chart. Taste your brew, tap the zone it's in, and follow the arrow back to the sweet spot.
Weak
Strong
Tap a zone on the compass to see what to adjust.
Flavor Wheel
Explore the SCA flavor categories interactively — click anywhere on the wheel to drill in.
Coffee Flavor Wheel
Explore coffee flavors from broad categories to specific tasting notes. Click any segment to learn more.
Click any segment to explore flavors