The short answer
Buy a scale with 0.1 g readability, at least 2 kg capacity, and a built-in timer. You’ll spend $15–40 for a good one. That’s it — everything else (Bluetooth, flow-rate sensors, app integration) is nice but not necessary for brewing great coffee at home.
A scale matters because eyeballing scoops introduces 2–4 g of variance per brew, which is enough to swing a cup from balanced to sour or bitter. Weighing your dose and water makes every cup taste the same.
The four specs that matter
• Readability: 0.1 g. A kitchen scale that reads in 1 g increments can’t register the 0.5 g adjustment that fixes a pour over. For espresso (where doses are 15–20 g), 0.1 g resolution is essential.
• Capacity: 2,000 g (2 kg) minimum. A full Chemex brew can reach 800+ g; a cold brew batch hits 1,500 g. Anything under 2 kg will max out too often.
• Built-in timer. Brew time is the second lever after ratio. A scale with a timer means one fewer device on the counter.
• Responsive display. Water pours fast during a pour over. The scale needs to update in under 0.5 seconds so you can stop at your target weight without overshooting. Test this with a slow water pour before committing.
What you can skip
• Bluetooth and apps — useful for logging, but most beginners just want to hit the right weight. Add this later if you want to geek out.
• Auto-tare modes — some scales auto-zero when they detect a vessel. This can misfire mid-brew and reset your count. Manual tare is more reliable.
• Flow-rate display — shows grams-per-second for pour over. Helpful for competition brewers, overkill for a daily cup.
Spend the saved money on better coffee beans instead. A $20 scale plus fresh, well-roasted beans will outperform a $100 scale with stale pre-ground every time.
How to use a coffee scale
1. Place your brewer or portafilter on the scale. Press tare to zero it.
2. Add ground coffee until you hit your target dose (e.g., 15 g for an AeroPress, 30 g for a Chemex).
3. Tare again. Start the timer and pour water, watching the weight climb to your target (e.g., 250 g for a 1:17 ratio with 15 g of coffee).
4. Record the dose and water weight that tasted best. Repeat it tomorrow. That’s the whole system.
Use the Brew Ratio Calculator to find the right water weight for any dose and ratio.