Hario Smart G Grinder: The Electric-Compatible Hand Grinder Worth Knowing About

Most hand grinders force you to choose: manual effort or buy a separate electric grinder. The Hario Smart G does something interesting. It's a manual grinder that you can convert to electric by attaching a power adapter to the top. I've been using mine for about eight months, and that dual personality is exactly as useful as it sounds.

The Hario Smart G is a transparent, cylindrical hand grinder with ceramic conical burrs, a click-stop adjustment system, and a removable handle that can be replaced with an optional electric grinding attachment (sold separately). It holds about 24 grams of beans and grinds at roughly the same quality as other Hario ceramic models. But the option to go electric when you're feeling lazy is what sets it apart.

The Electric Adapter: How It Works

The Smart G's top shaft is designed to accept both the included crank handle and an optional electric motor attachment. You unscrew the handle, click the motor unit onto the same hex shaft, press a button, and the motor does the grinding for you.

The motor attachment runs on AA batteries (two of them) and spins at a moderate pace. It's not fast like a Baratza or a Fellow Ode. Grinding 20 grams of medium-roast beans takes about 90 seconds with the electric attachment versus about 2 minutes by hand. So you're saving effort, not time.

Is the Electric Attachment Worth Buying?

It depends on how you use the grinder. If the Smart G is your travel grinder, the electric attachment adds weight and bulk that defeats the purpose of going portable. I leave the motor at home.

But if the Smart G sits on your kitchen counter as your daily grinder, the electric attachment is genuinely nice. Some mornings I want the ritual of hand grinding. Other mornings, I just want coffee. Having both options in one grinder is convenient.

The attachment costs about $25-35 on its own. Considering the whole grinder costs around $40-50, that's a significant add-on. But it's still cheaper than buying a separate electric grinder.

Grind Adjustment and Settings

The Smart G uses a numbered click-stop dial on the bottom of the burr assembly. Each number corresponds to a fixed grind setting, and the clicks are firm and satisfying. No drift, no slipping, no guessing.

My Settings Reference

I've dialed in these settings over months of daily use:

• Setting 1-2: Very fine. Too fine for most brewing. Only useful for Turkish-style coffee.
• Setting 3-4: Fine. Works for Moka pot brewing.
• Setting 5-7: Medium-fine to medium. My AeroPress sweet spot is 6. Pour over works well at 7-8.
• Setting 8-10: Medium to medium-coarse. Drip machines and Chemex do well here.
• Setting 11-14: Coarse. French press territory. I like setting 12.

The numbered dial makes it easy to share settings with friends or return to a known good position after experimenting. This is a real advantage over Hario's older stepless grinders, where "about one and a half turns" was the best reference you could give someone.

Build and Design

The Smart G has a distinctive look. The entire body is transparent plastic, so you can watch the beans feed into the burrs and see grounds accumulate below. It's oddly satisfying to watch, and it's practical too, since you can see exactly when all the beans have been ground.

The transparent body is polycarbonate, which is lighter than glass and won't shatter if dropped. After the glass jar issues on the MSS-1 and Mini Mill models, I think Hario made the right call here. My Smart G has survived a couple of counter-height drops with just minor scuffs.

Capacity and Portability

Like most small Hario grinders, capacity is about 24 grams. Enough for one cup. If you're brewing for two, you're grinding twice.

The grinder is compact but not quite as slim as the Mini Mill series. The transparent body has a slightly wider diameter. It still fits in a travel bag easily, but it won't nest inside an AeroPress like the Mini Mill Plus does.

Weight without the electric attachment is about 10 ounces. Light enough for backpacking if you're willing to dedicate the space.

Grind Quality Assessment

The Smart G uses the same ceramic conical burrs found across the Hario hand grinder lineup. If you've used a Skerton, Mini Mill, or MSS-1B, the grind quality is familiar.

Strengths

Medium grind settings produce a decent particle distribution for pour over and drip. My V60 brews with Smart G-ground coffee taste clean with good sweetness. The consistency is reliable enough for repeatable results from cup to cup.

The electric attachment doesn't change grind quality. The motor spins the same burr at a similar speed to hand cranking, so the output is the same regardless of how you power it.

Weaknesses

Fine and coarse extremes show the limitations of ceramic burrs at this price point. Very fine grinds produce too many dust-like particles, and very coarse grinds include some obviously undersized pieces. This matches every other sub-$50 Hario grinder I've tried.

Espresso is still not advisable. If you need espresso-quality grinding, you'll want to look at the options in our best coffee grinder guide. Steel burr grinders in the $100+ range are where espresso consistency starts to become realistic.

Smart G vs Other Hario Grinders

If you're deciding between Hario models, here's how the Smart G fits in:

Compared to the Mini Mill Plus, the Smart G is slightly larger but offers the electric option and a more durable polycarbonate body. If portability and AeroPress nesting matter most, go Mini Mill Plus. If versatility matters more, go Smart G.

Compared to the Skerton Pro, the Smart G is much smaller and more portable. The Skerton holds about 100 grams and works better as a dedicated home grinder. If you only grind at home and want capacity, the Skerton wins.

Compared to the market outside Hario, grinders from Timemore and 1Zpresso offer better grind consistency and faster grinding at slightly higher prices. Browse our top coffee grinder roundup for comparisons across brands.

FAQ

Does the Hario Smart G come with the electric attachment?

Most standard packages include only the hand grinder with the manual crank handle. The electric grinding attachment is sold separately. Some retailers offer bundles that include both, so check before buying.

What batteries does the electric attachment use?

Two AA batteries. I use rechargeable NiMH batteries and get about 30-40 grinding sessions before needing to recharge. Standard alkaline AAs last a bit longer. The motor isn't powerful enough to drain batteries quickly.

Can I wash the Smart G in a dishwasher?

No. Hand wash only. The polycarbonate body, ceramic burrs, and adjustment mechanism aren't designed for dishwasher temperatures or water pressure. Warm soapy water and a brush are all you need.

How does the Smart G compare to a Porlex Mini?

Both are compact ceramic burr grinders in the same price range. The Porlex has a stainless steel body that's more durable but heavier. The Smart G's electric option is unique. Grind quality is similar between the two. I'd choose the Porlex for travel durability and the Smart G for home versatility.

The Verdict

The Hario Smart G carves out a small but real niche in the hand grinder market. The electric adapter option is genuinely useful, not just a gimmick, and the transparent body is both fun to watch and practically unbreakable. It grinds coffee at the same quality level as other Hario ceramic models, which means it's perfectly good for pour over, AeroPress, and French press. Just don't ask it to handle espresso, and you'll get along fine.