Sake · Styles & Labels · Study guide
Reading a Sake Label
A study guide to reading a sake label — the essential kanji, the labelling terms kimoto, yamahai, muroka, nama and genshu, and what SMV and acidity tell you.
A sake label reads like a sentence made of clauses, and once you can pick out the clauses it is surprisingly friendly. There is the grade (how it was built), a set of style terms (which finishing steps were kept or skipped), and sometimes two numbers — the Sake Meter Value and the acidity — that hint at how sweet or dry it will taste. The grade we cover in grades of sake; this guide is about everything else on the bottle.
Two things pay off fastest: a handful of kanji you can recognise on sight, and the five style words — kimoto, yamahai, muroka, nama, genshu — that describe how the sake was made and finished rather than its grade.
The one thing to fix first: the label answers "how was it finished?"
Beyond the grade, most of what a label tells you is which finishing choices the brewer made — each one a step from pressing & finishing either kept or left out:
- Kimoto (生酛) / yamahai (山廃) — made with a traditional, natural-lactic-acid starter; expect more body, acidity and savour (fermentation).
- Muroka (無濾過) — not charcoal-filtered; keeps its natural colour and fuller flavour.
- Nama (生) / nama-zake (生酒) — unpasteurised; fresh and lively, needs cold storage.
- Genshu (原酒) — undiluted; full-bodied and strong, around 18–20% ABV.
Stack them and you can read a mouthful like junmai ginjō kimoto muroka nama genshu as a plain description: pure-rice, ≤60%-polished, traditional-starter, unfiltered, unpasteurised, undiluted sake — big, tangy and vivid.
The kanji worth knowing
You don't need to read Japanese — you need to recognise a dozen shapes.
| Kanji | Rōmaji | Meaning |
|---|---|---|
| 日本酒 | nihon-shu | "Sake" — the drink itself |
| 清酒 | sei-shu | "Refined sake" — the legal term for sake |
| 純米 | junmai | Pure rice, no added alcohol |
| 本醸造 | honjōzō | A little distilled alcohol added |
| 吟醸 | ginjō | ≤60% polished, fragrant style |
| 大吟醸 | daiginjō | ≤50% polished, most delicate |
| 特別 | tokubetsu | "Special" — ≤60% or a special method |
| 生酛 | kimoto | Traditional natural-acid starter |
| 山廃 | yamahai | Kimoto without the pole-mashing |
| 生酒 | nama-zake | Unpasteurised |
| 原酒 | genshu | Undiluted |
| 古酒 | koshu | Deliberately aged sake |
Spot 純米 (junmai) and 吟醸 (ginjō) and you already know the two things that matter most: pure rice or not, and how fragrant.
The two numbers
- Sake Meter Value (nihonshu-dō, 日本酒度) — a sweetness/dryness gauge from the sake's density. The higher (more positive), the drier; negative is sweeter. Around +3 is roughly neutral; +10 is very dry, −5 noticeably sweet.
- Acidity (san-dō, 酸度) — the total acid. Higher acidity tastes sharper and drier and balances sweetness; lower tastes rounder and softer. A typical value sits around 1.4–1.6.
The two work together: a sweet-numbered sake with high acidity can still taste dry, because the acid offsets the sugar. Read them as a pair, not in isolation.
Key facts
| Grade clause | Junmai / honjōzō / ginjō / daiginjō (see grades guide) |
| Starter clause | Kimoto or yamahai = traditional, fuller, tangier |
| Finishing clauses | Muroka (unfiltered), nama (unpasteurised), genshu (undiluted) |
| SMV (nihonshu-dō) | Higher = drier; +3 ≈ neutral |
| Acidity (san-dō) | Higher = sharper, drier; balances sweetness |
| Legal name | 清酒 sei-shu ("refined sake") |
SMV and acidity, briefly
The Sake Meter Value is measured by how dense the sake is: unfermented sugar makes it heavier (negative, sweet), while alcohol makes it lighter (positive, dry). It is a handy shorthand but a crude one, because it ignores how acidity and amino acids shift the perception of sweetness. That is why the number and the tasting so often disagree — and why the label sometimes also lists an amino-acid value (aminosan-dō), a proxy for umami and richness. Treat the numbers as a first guess, confirmed at the tasting.
In this guide
The full guide below goes deeper into decoding a real bottle:
- Working through a stacked label, term by term
- Terms not covered by the grade — nigori, sparkling, taru, koshu
- Vintage, region and brewery cues
- When the numbers mislead — and why to trust the glass
- Classic exam questions
Reading a real label, term by term
Take tokubetsu junmai yamahai muroka genshu, SMV +6, acidity 1.9. Decoded:
- tokubetsu junmai — pure rice, either ≤60% polished or a special method (the grade).
- yamahai — a traditional natural-acid starter: fuller body, higher acidity, savour.
- muroka — not charcoal-filtered: natural colour, more flavour.
- genshu — undiluted: strong (18%+), concentrated.
- SMV +6 with acidity 1.9 — a dry number and high acid, so this will taste firmly dry, tangy and structured.
The picture assembles itself: a big, dry, savoury, food-loving sake, best at cool room temperature or gently warmed, not ice-cold.
Terms beyond the grade
Some words describe a whole speciality style rather than a finishing tweak — you'll meet these in full in speciality styles:
- Nigori (にごり / 濁り) — cloudy, coarse-filtered, leaving rice sediment.
- Sparkling (発泡 / awa) — carbonated or bottle-fermented.
- Taru (樽) — rested in cedar casks, fragrant and woody.
- Koshu (古酒) — deliberately aged, amber and honeyed.
Region, brewery and vintage
Labels also carry the brewery (kura) name, often the largest characters, and frequently the prefecture, which hints at a regional style (regions of Japan). A brewing-year (BY) date may appear — sake is largely non-vintage and meant to be drunk young, so a recent date is usually what you want, except for koshu.
When the numbers mislead
Because SMV ignores acidity and amino acids, two sakes at +4 can taste completely different — one crisp and dry, the other round and almost sweet, depending on their acid and umami. Use the numbers to narrow the field, then let the grade and style terms — and ultimately the tasting — decide. The label is a map, not the territory.
Classic exam questions
- What does junmai (純米) on a label guarantee? — pure rice, with no added distilled alcohol.
- What does nama (生) mean? — the sake is unpasteurised.
- What does genshu tell you? — the sake is undiluted, so stronger (~18–20%).
- A higher Sake Meter Value means what? — a drier sake.
- How do kimoto and yamahai on a label change your expectations? — expect more body, acidity and savour from the traditional starter.
- What is the legal term for sake, seen on labels? — sei-shu (清酒).
Learn a dozen kanji and five style words and the most intimidating bottle in the shop turns into a plain-English description of how the sake was made.