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First Month Using a Kitchen Scale for Coffee

A $25 piece of equipment changed how I make coffee more than the $200 I'd previously spent on grinder upgrades. A first-month report on what actually happened. I'd been making coffee at home for two years before I bought a scale. I'd watched dozens of YouTube videos that all said "weigh your coffee," and I'd ignored all of them. Eyeballing scoops worked fine for me. The cup was OK. I didn't see the point. Last month I finally bought a cheap kitchen scale ($25) and tried weighing for two weeks. By the end of the first week I'd thrown away my coffee scoop. Here's what I learned about why "eyeballing it" was costing me more than I thought. The thing nobody told me I assumed my "scoop" of coffee was roughly consistent day-to-day. It wasn't. When I started weighing, the same scoop ranged from 14g to 22g depending on: How loosely or tightly I packed the scoop How fresh the beans were (older beans are less dense) ...
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Cold Brew at Home: An Honest First-Month Journal

A mason jar, a bag of beans, four weeks, and roughly a gallon of cold brew. Most of the YouTube advice was right. Some of it was very wrong. Here's the journal.

Pouring coffee in a moody, low-lit setting
Photo: George Kroeker on Unsplash

I started making cold brew at home in March. The trigger was the local café charging $7 for a 12oz cold brew that I knew from reading takes about 45 cents in materials to produce. After a week of paying $7, I bought a one-quart mason jar and a fine-mesh strainer.

Here's what happened over the next four weeks.

Week 1: Following recipes blindly

I picked the highest-rated recipe I could find: 1:8 ratio (coffee to water), 18-hour steep, room temperature, coarse grind. I used a medium-roast Colombian I had on hand.

The result was... fine? Not great. Surprisingly bitter, surprisingly thin. I'd expected the smooth, low-acid drink that cold brew is famous for. Instead I got something that tasted like weak iced coffee with a slightly off aftertaste.

The problem was the bean. Medium-roast Colombian is too acidic for the cold brew process. The slow extraction emphasizes the wrong compounds. I'd assumed a "decent bean" would work; it didn't.

Week 2: The bean change

I switched to a darker roast — a Sumatran I usually make French press style. The difference was immediate and significant. The same recipe (1:8, 18 hours, coarse) produced a smooth, chocolatey cup with virtually no bitterness.

This was the single biggest learning of the four weeks. Cold brew rewards darker, lower-acidity beans. The recipe doesn't change much; the bean changes everything. Save your bright Ethiopian for hot pour-over. Use medium-dark beans for cold brew.

Week 3: The grind problem

By week three I was making cold brew every Sunday for the week ahead. The problem: my hand grinder takes about two minutes to grind 100g. Cold brew uses a lot of beans (one gallon needs about 200g). Saturday-night cold brew prep started feeling like a chore.

I tried buying pre-ground "cold brew" coffee from the grocery store. Bad idea. The pre-ground coffee was already stale by the time I bought it, and the grind was inconsistent. The cold brew came out muddy and thin.

What worked: I started asking my local roaster to grind a 1lb bag specifically for cold brew (very coarse). They're happy to do this if you ask. The grind is fresher than supermarket pre-ground because they're grinding it the day you buy it, and the coarse setting holds up for about 5 days before quality drops noticeably.

Week 4: The dilution discovery

Most YouTube cold brew recipes produce a "concentrate" that you're supposed to dilute 1:1 with water or milk. I'd been ignoring this and drinking it straight, which produced a stronger drink than I needed. By week four I was getting the jitters before noon and not understanding why.

Once I started actually diluting the concentrate the way the recipes said, the experience changed. I could drink more of it, the caffeine dose was reasonable, and the flavor came through better. Concentrate-to-water 1:1 over ice is the right move. Concentrate-to-milk 1:1 produces a drink that's basically a homemade iced latte.

What I'd tell someone starting

Buy a good 1L or 2L mason jar with a fine-mesh strainer. Don't buy a fancy "cold brew system" — they're $40–60 for what is basically a jar with a filter. The mason jar is $5 and lasts forever.

Use medium-dark to dark beans. This is the most important variable. A great Ethiopian bag will not give you good cold brew. A decent Sumatran or Brazilian dark will.

Make concentrate, then dilute. The 1:8 ratio for 18 hours produces a strong concentrate that you cut 1:1 with water or milk. Drinking it undiluted is like drinking espresso shots — possible, not advisable.

Coarsest grind your grinder can produce. Finer grinds clog the filter and produce muddy results. If your grinder is uneven at coarse settings, ask your local roaster to grind a bag for you.

Total cost after one month

Mason jar: $5. Fine-mesh strainer: $8. Coffee beans (about 800g over the month): roughly $24. Total: $37.

Cups of cold brew produced: roughly 30. Cost per cup: about $1.20.

Cost per cup at the local café: $7. Money saved this month: roughly $174.

Worth a Sunday afternoon of brewing? Easily.

/ Read more on HexRoast

If you want the nitrogen-charged version on the main site

This was the basic-cold-brew journal. If you want the deep guide to nitrogen-charged cold brew at home — kit, costs, why nitrogen actually changes the cup, and whether it's worth the equipment — the deeper version lives on HexRoast:

→ Nitrogen Cold Brew for Coders · hexroast.com
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