What Size Hangiri (Sushi Oke)? Read the Rice, Not the Tub

For most households the answer is the 30 cm tub. Not because 30 cm is a lucky number, but because a Japanese maker’s own sizing chart says a 30 cm hangiri holds three gō of rice at a depth of 26 mm — and 26 mm is a layer that cools. Buy the 24 cm because it looks tidier on the shelf, put the same three gō in it, and the rice sits about 43 mm deep. It steams itself from the middle while you fan the top.

That is the whole article in two sentences, and it is the number every product listing leaves out. Shops sell you a diameter and a headcount. What decides whether your sushi rice comes out glossy and separate, or damp and packed, is how deep the rice sits — and diameter is just the lever that sets it.

A hangiri is a cooling device, not a bowl

The tub goes by three names you will see used interchangeably: hangiri, handai, and sushi oke. All three refer to the same round, flat-bottomed wooden tub bound with metal bands, and all three turn up in listings from the same shop, sometimes on the same page.

What it does is narrower than “mixing bowl” suggests. Freshly cooked rice arrives at the tub carrying more water than sushi rice should have, and you are about to add more liquid in the form of seasoned vinegar. Two things have to happen at once: the grains have to take up the vinegar without being crushed, and the excess moisture and heat have to leave. Wood handles the moisture — untreated sawara cypress pulls water out of the surface layer instead of condensing it back down like a metal or glass bowl does. The shallow, wide shape handles the heat, because a thin layer has a lot of surface for its volume.

Which means the tub is doing thermal work, not decorative work. Judge it the way you would judge a cooling rack.

What size hangiri to buy: the maker’s own chart

Shimizu Mokuzai, a cooper in Kiso that has been making these tubs for generations, publishes something almost nobody translates: a sizing sheet that gives, for each diameter, the rated load of rice and the depth that rice reaches. Here it is, with the headcounts the maker assigns.

Outer diameter	Height	Rated rice	Depth of rice	Serves
21 cm	7 cm	0.8 gō	16 mm	smallest made
24 cm	8.5 cm	1 gō	15 mm	1–2
27 cm	9 cm	2 gō	22 mm	2–3
30 cm	9 cm	3 gō	26 mm	4
33 cm	9 cm	5 gō	35 mm	6–7
36 cm	9.5 cm	7 gō	40 mm	9–10
39 cm	10 cm	1 shō (10 gō)	49 mm	~13
42 cm	10.5 cm	1.5 shō	60 mm	~20
45 cm	11 cm	2 shō	75 mm	commercial

Read down the depth column and the pattern jumps out. Every size a household would own lands between 15 mm and 40 mm. The depths only climb past that — 49, 60, 75 mm — once you reach the sizes a restaurant buys, where somebody is cutting and fanning the rice continuously and turning the whole mass over as they go. At home, nobody does that for twenty minutes. So the household sizes are, in effect, designed to keep the rice shallow enough that ordinary fanning is enough.

Buying one size too small is the mistake people actually make

Nobody buys a 45 cm restaurant tub for a two-bedroom flat. The real error runs the other way: the 24 cm looks like a sensible starter size, costs a little less, and stores easily — so people buy it and then cook three gō in it, because three gō is what a family of four eats.

You can work out what that does. Take the maker’s own numbers, back out the volume of finished sushi rice per gō — it comes to roughly 500–530 ml once cooked and loosened — and drop the same three gō into each size. The model reproduces the maker’s published 26 mm for the 30 cm tub exactly, which is a good sign it is describing the real thing.

Forty-three millimetres is not a catastrophe. It is the difference between rice that separates into distinct grains and rice that goes slightly claggy at the bottom while the top dries out. You will taste it, and you will blame your vinegar ratio.

Sawara or hinoki? Buy the one that smells less

Both are Japanese cypresses and both turn up in kitchenware, but they are not interchangeable here. Sawara (Chamaecyparis pisifera) is the one makers use for rice tubs, and the reason is negative rather than positive: it carries much less aroma than hinoki. Hinoki’s scent is the whole point of a hinoki bath — it is not what you want migrating into vinegared rice that you have just seasoned carefully.

Sawara also takes on and gives up water quickly and holds its dimensions as it dries, which matters for a vessel that gets wet and dry repeatedly and is held together by tension. If a listing says only “cypress” or “hinoki cypress” without naming sawara, treat that as a flag and ask — the same way you would with any Japanese listing that goes quiet on the specifics. Our guide to reading a Japanese tableware listing covers what those silences usually mean.

One thing to be clear about: this is bare, unfinished wood. It is not lacquered, and it should not be. If you are shopping for wooden pieces that are coated, the distinction between real urushi and a plastic finish is a separate problem, covered in our guide to Japanese lacquerware.

Copper bands or a stainless hoop?

Traditional tubs are bound with two copper bands. Copper is soft enough to be worked tight around the staves by hand and stiff enough to hold them there. It also darkens — makers explicitly warn that the copper may go dull or patchy from temperature swings in transit, and that this is cosmetic. Do not send one back because the bands arrived brown.

Restaurant suppliers increasingly sell the same tubs with stainless hoops instead, marketed as the sanitary option. For a commercial kitchen inspected on materials, that argument makes sense. For home use, the practical difference is small and the copper looks better as it ages. Buy on size and wood; treat the band as a preference.

What a hangiri costs

Real Japanese-made sawara tubs sit higher than people expect. As of this writing, a 27–33 cm copper-banded sawara tub from a Japanese specialist runs around $96, and a 36 cm from the Kiso maker Umezawa lists at $129. Below roughly $50 you are usually looking at a thinner, wider-grained tub, often not sawara, and sometimes not made in Japan at all.

That price buys a piece that lasts decades if it dries properly and turns into firewood in two years if it does not. Which brings us to the part that actually decides whether you should own one.

First use, and the step the two makers disagree about

Here is a genuinely useful thing you will not find on a comparison site: makers do not agree on how to break one in.

• Tikusan instructs you to fill the new tub with water, add two or three small cups of vinegar, soak it for two to three hours, then rinse.
• Umezawa states that although soaking a new tub before adding rice is generally necessary, with theirs it is not.

Both are correct about their own product, because the treatment of the wood before it ships differs. Follow the instruction that came with your tub, not the one you read somewhere else. If none came with it, the soak is the conservative choice — it costs you an afternoon and swells the staves against the bands.

After that, the routine is short and both makers agree on it:

• Before every use, wipe the inside with a lightly damp cloth. This is the step people skip, and it is why their rice sticks. A dry tub grabs the first layer of grains; a faintly damp one releases them.
• After use, wash with water or warm water, with a mild neutral detergent only if you need it. Umezawa specifically says to avoid chlorine-based cleaners.
• Then dry it properly — upside down, in a shaded, ventilated spot, all the way through before it goes back in the cupboard. Umezawa’s care note puts it plainly: dry thoroughly when unused, to prevent mould and the like.
• Not for the dishwasher. Makers state this directly for these tubs. If you want the general rules for what does and doesn’t survive a dishwasher across Japanese tableware, we’ve written those up in a separate guide.

Note that “shaded” is doing real work in that sentence. Drying bare cypress in direct sun is how you get splits along the grain and slack bands. The instinct to put a damp wooden thing in the sunshine is exactly wrong. The same conservative logic — dry completely, avoid harsh chemistry, don’t rush it — runs through how we care for everything else on the table.

When not to buy a hangiri at all

If you make sushi twice a year, buy nothing. The two functions the tub performs are surface area and moisture removal, and you can get most of the first one for free: spread the rice in the widest non-metal dish you own — a large ceramic platter, a glass baking dish — and fan it while you fold the vinegar through with a slicing motion rather than a stirring one. You will not get the wood’s moisture-wicking, so the rice will be a touch wetter. Nobody at your table will identify why.

What makes a wooden tub worth $100 is frequency plus the willingness to dry it. A hangiri that lives in a damp cupboard, still faintly wet from last time, is worse than the baking dish. Be honest about which household you are before you buy, the same way you would when deciding how many rice bowls you actually need.

And if the reason you are here is that you want to serve sushi properly rather than make a career of it, the money goes further on what the rice ends up on. Our guide to sushi plates and serveware covers that side, and the sizes and terms reference will decode the dimensions in any listing you are looking at.

The short version

Pick the size by the depth it produces, not by the headcount on the label. Three gō in a 30 cm tub gives you 26 mm of rice and that is the target. Insist on sawara. Take the copper. Wipe it damp before you use it, dry it in the shade after, and it will outlive the person who bought it.

Disclosure: Nagori Ware is an independent editorial guide written from Japan. Some links elsewhere on the site are affiliate links. Parts of this site are drafted with AI assistance and checked against Japanese sources. General information, not legal or safety advice.