Sushi Rice Vinegar Calculator

How the calculator works

The calculator scales the vinegar mixture from the sushi rice recipe in the Kikkoman Cookbook. That recipe is written for 360 grams of uncooked rice:

• 4 tablespoons of rice vinegar
• 2 tablespoons of sugar
• 1 teaspoon of salt
• 340 milliliters of water to cook the rice

Your rice weight is divided by 360 to get a scaling factor, and each amount is multiplied by it.

amount = recipe amount x (your rice in grams / 360)

If you enter ounces, pounds or kilograms, the weight is converted to grams first.

Worked example

You are making sushi for a group and have 540 grams of rice.

1. 540 / 360 = 1.5 times the recipe.
2. Rice vinegar: 4 x 1.5 = 6 tablespoons.
3. Sugar: 2 x 1.5 = 3 tablespoons.
4. Salt: 1 x 1.5 = 1 1/2 teaspoons.
5. Cooking water: 340 x 1.5 = 510 milliliters.

For a small batch of 180 grams, halve everything: 2 tablespoons of vinegar, 1 tablespoon of sugar and 1/2 teaspoon of salt.

The ratio in one line

If you want to remember it without a calculator: the vinegar is twice the sugar, and the salt is a teaspoon for every 4 tablespoons of vinegar.

By volume that is 12 parts vinegar, 6 parts sugar and 1 part salt. Any spoon will do as the “part”, as long as you use the same one for all three.

Why weigh the rice

The recipe gives the rice by weight, and that is the reliable way to scale it. A “cup” of rice is not one thing. A US measuring cup holds about 237 milliliters, and the cup that comes with a rice cooker holds about 180. Weighing removes the question.

Weigh the rice dry, before rinsing. Rinsed rice has taken on water and weighs more.

Mixing it in

The Kikkoman recipe is specific about how the vinegar goes in, and the method matters as much as the amounts.

1. Stir the vinegar, sugar and salt together until dissolved.
2. Put the hot cooked rice in a bowl and pour the vinegar mixture over it.
3. Let it sit for 1 minute.
4. Mix with a rice paddle using a cutting motion, as though breaking the rice apart, so it does not turn sticky and mushy.
5. Fan the rice as you mix.
6. It is ready when the rice has a glossy shine and has cooled.

Season the rice while it is hot. Hot rice takes up the vinegar. Cold rice lets it sit on the surface.

A wide, shallow bowl works better than a deep one, because the rice cools faster and you can cut through it without crushing the grains.

Cooking the rice

The same recipe cooks 360 grams of rice with 340 milliliters of water, with a small piece of kombu added if you like. That is slightly less water than usual for plain rice, because the vinegar mixture adds liquid afterward. Rice cooked with the full amount of water and then seasoned can end up too soft to shape.

The calculator scales the cooking water along with the seasoning.

Adjusting to taste

The amounts here are one published recipe. Sushi rice seasoning varies from cook to cook and region to region, with some preferring it sharper and some sweeter.

If you change it, change one thing at a time and keep notes:

• Less sweet: reduce the sugar and leave the vinegar and salt alone.
• Sharper: add a little more vinegar, but watch the texture, because more liquid means softer rice.
• For rolls with strong fillings: the rice can take the full seasoning.
• For plain fish: some cooks ease back so the rice does not compete.

Tips and common mistakes

Use unseasoned rice vinegar. This recipe adds its own sugar and salt. If your bottle says “seasoned” or “sushi vinegar”, it already has them.

Do not use distilled white vinegar as a straight swap. It is much sharper than rice vinegar.

Do not stir like porridge. Stirring in circles mashes the grains. Cut and fold.

Keep the finished rice covered with a damp cloth. It dries out quickly, and it is at its best at about body temperature, not cold from the fridge.

Make only what you will use. Seasoned sushi rice does not reheat well, so scale the batch to the meal.