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⚡ PourMaster
Flow rate & pour structure calculator — adapts to your kettle, dose & brew time. No more channeling or stalls.
Spout diameter & flow coefficient affects pour cadence
Affects flow & stall risk
Dynamic level compensation
💧 Water volume (1:16 ratio): 288 g
⚖️ Bloom water: 40 g
📉 Dynamic flow adjustment: active
Free calculator — pour metronome mode requires interaction (tap 'Play beep cadence')
📖 The PourMaster Guide
How to use the calculator, why it changes your brew, and the physics inside.
⚡ How to use it (3 simple steps)
1. Set up your brew parameters – Above, choose your gooseneck kettle model, coffee dose (grams), and target brew time (e.g., 3:30). Then select roast level (light/medium/dark), grind size (fine to coarse), starting water volume in your kettle (dynamic level compensation), and optional temperature offset.
2. Generate your pour structure – Click ✨ Generate pour structure & cadence. Instantly you’ll see a second‑by‑second timeline: bloom weight & duration, pulse flow rate (g/s), circle speed (slow/medium/fast), and exact spout height above the coffee bed to prevent cratering or channeling.
3. Brew by ear – the killer feature – Tap 🎧 Play beep cadence. An audio metronome beeps at the exact rhythm to match your target flow rate. Each beep ≈ pour 2.5g. No need to stare at a scale – just listen and pour. The metronome adapts to your pulse flow, and you can stop anytime.
🧠 Why it matters (beyond "pour in circles")
Generic recipes ignore real physics: your kettle’s spout diameter, water level drop during pouring, grind size, and roast density all affect flow. Beginners either channel (pour too fast, creating tunnels) or stall (pour too slow, clogging the filter). PourMaster models fluid dynamics in real‑time and adds dynamic water level compensation – as your kettle empties, the natural flow rate decreases; the calculator pre‑adjusts your pour cadence so the last pulse is as consistent as the first.
With grind & roast integration, the tool automatically slows down circle speed for dark roasts (reducing bitterness) and recommends a higher spout height for light roasts (more agitation). The result: repeatable, balanced extractions without guesswork.
📐 The math behind it (simplified)
Base flow model: Q = A_spout × Cd × √(2 × g × H)
Where Q = flow rate (g/s), A_spout = spout inner area, Cd = discharge coefficient (depends on kettle shape), g = gravity, and H = water height in kettle.
As H decreases (kettle empties), natural flow drops. PourMaster compensates by adjusting the target pour rate upward early in the brew. Additionally, grind size imposes a flow ceiling – for fine grind, max flow ≈ 4.2 g/s (to avoid stall); for coarse, up to 9 g/s. Roast level modifies circle speed and spout height to control agitation and extraction.
Example: 18g dose, 3:30 brew → total water 288g, bloom 45g → remaining 243g over ~165s → average flow ~4.8 g/s. If your kettle starts with 500mL, dynamic compensation lowers target to ~4.3 g/s during later pulses.
❓ Frequently asked questions
🤔 Does it work with any gooseneck kettle?
Yes. The dropdown includes Fellow Stagg, Hario Buono, Brewista, plus a “Generic” option. The math uses spout diameter and a flow coefficient – you can pick the closest match.
🔊 Do I need a Bluetooth scale or special hardware?
No. The audio metronome replaces visual scale tracking. Just listen to the beeps and pour. For advanced users, you can still use a scale, but the beep cadence gives you hands‑free guidance.
☕ Can I use PourMaster for Chemex, Kalita Wave, or flat-bottom brewers?
Absolutely. Select medium to medium‑coarse grind (Chemex) and extend brew time accordingly (e.g., 4:00–4:30). The tool will recommend slower circles and slightly higher spout height to avoid bypass.
💧 Why do I need to enter “starting water in kettle”?
Because water level changes flow rate. A nearly empty kettle flows slower. PourMaster uses that info to dynamically adjust your pour speed recommendations, so you don’t unintentionally slow down mid‑brew.
🎯 How accurate is the metronome?
It uses the Web Audio API with sub‑millisecond scheduling. The beep interval matches your calculated flow rate within ±3% – more than enough for manual pouring. For best results, practice one or two pours.
Built for specialty coffee enthusiasts — from beginners to competition brewers.
Scroll up to access the full PourMaster calculator • Free tool, no sign‑up required
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