Sake meter value (SMV): dry vs sweet, explained

Look at the back of a sake label and you'll often find a small number with a plus or minus sign: the sake meter value, or SMV. It's the closest thing sake has to a "dry or sweet" scale. Here's what it measures, how to read it, and why it's only half the story.

What SMV measures

SMV is called nihonshu-do (日本酒度) in Japanese. It's a measure of density: how heavy the sake is compared to pure water at the same temperature.

Two things in sake change its density, and they pull in opposite directions:

• Sugar makes sake denser. Leftover sugar from the rice that the yeast didn't ferment adds weight.
• Alcohol makes sake lighter. Alcohol is less dense than water, so more of it lowers the density.

Brewers measure it with a hydrometer, a small float that sinks deeper in lighter liquid and rides higher in denser liquid. Water is set at zero. A sake lighter than water gets a plus number. A sake denser than water gets a minus number.

How to read the numbers

The rule of thumb is simple:

• Plus numbers (+3, +5, +10) point to less sugar, so the sake tends to taste drier.
• Minus numbers (-2, -5, -10) point to more sugar, so the sake tends to taste sweeter.
• Numbers around zero sit in the middle and are often described as balanced or neutral.

Most sakes land somewhere between about -3 and +10, but you'll find outliers on both sides. Some very sweet dessert-style sakes go far into the minus numbers, and some sakes are proudly labeled "super dry" with high plus numbers.

SMV	Usually tastes
+6 and higher	Dry to very dry
+2 to +5	Slightly dry
-1 to +1	Balanced
-2 to -5	Slightly sweet
-6 and lower	Sweet

Treat this table as a starting point, not a rule. The next three sections explain why.

Acidity changes everything

SMV tells you about sugar. It doesn't tell you how that sugar feels on your tongue, and that's where acidity comes in.

Acidity in sake is usually listed as a number around 1 to 2, sometimes on the label as san-do (酸度). Acids brighten a sake and cut through sweetness, the same way a squeeze of lemon makes a sweet drink taste crisper.

So two sakes with the same SMV can taste very different:

• Higher acidity makes a sake taste drier, crisper, and often fuller.
• Lower acidity makes it taste softer, rounder, and lighter.

Japanese brewers sometimes combine SMV and acidity into a single sweet to dry index (amakara-do) for exactly this reason. For more on the acid side, read sake acidity.

Alcohol and temperature matter too

Alcohol. Because alcohol lowers density, a stronger sake gets pushed toward the plus side of the scale even with the same amount of sugar. That means a sake with lower alcohol and a minus SMV may hold less sugar than you'd guess from the number alone. Most sake is around 15 to 16% ABV, so the scale is built around that range. See how strong is sake for more.

Temperature. Cold tightens sake. Served ice cold, sweetness reads as more subdued and the finish feels crisper. As sake warms up, its sweetness and rice flavor become more noticeable. Our hot or cold guide has the full temperature chart.

Everything else. Aroma, body, umami, and even the food you're eating all change how dry a sake tastes. A sake that tastes sweet on its own can taste drier with salty food.

Why our "dry and light" can says SMV -1

WESAKE Junmai Ginjo has an SMV of -1 and an acidity of 1.3, and "dry and light" is printed right on the can. Those facts fit together:

• -1 is close to zero. It's in the balanced middle of the scale, not a sweet sake.
• It's 12% ABV. With less alcohol than most sake, there's less to pull the density down, so the minus number doesn't mean much sugar.
• It's built to be served ice cold. At fridge temperature, the clean, crisp finish leads and any softness stays in the background.
• The profile is light. Light body, soft umami, and a crisp, clean finish all read as dry on the palate.

That's the point of this article: SMV is one clue, and the taste in your glass comes from all of them together. You can see the full spec sheet on the can.

For comparison, the Sakura bottle is a different sake with an SMV of +5 and acidity of 1.5, and it's described as elegantly dry. Two sakes, two numbers, both on the drier side to most people.

How to use SMV when you shop

1. Use it to compare, not to predict. Two sakes from the same shelf with SMVs of -4 and +8 will usually taste noticeably different. Two with -1 and +1 might not.
2. Read it with acidity. If both numbers are on the label, look at them together.
3. Check the grade too. Style matters as much as sugar. Our types of sake guide and how to read a sake label help you decode the rest.
4. Trust your own taste. If you like a sake, the number doesn't matter.

Not every label lists SMV, and that's fine. Plenty of great sake leaves it off. When it's there, it's a handy hint about what to expect, and a fun thing to compare as you try more.

New to all of this? Start with the complete guide to sake, or meet our sake.