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Rice koji

Cooked rice inoculated with koji mould and used in Japanese fermentation.

Rice koji — illustrative ingredient image

About Rice koji

Rice koji is rice inoculated with koji mould and allowed to develop under controlled conditions. The rice grains are typically cooked before inoculation and become coated with a pale, often white growth; the finished grains may be loose or clumped and have a mildly sweet, savory aroma. It is an ingredient for fermentation, not simply cooked rice.

It is used as a starter or component in Japanese food fermentation and may be sold fresh, refrigerated, dried or otherwise prepared. Moisture and activity differ among forms, so dried rice koji is not equivalent to fresh koji by weight or handling. Products intended for particular fermentations may also vary in grain and processing.

Ingredient type
other

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Where rice koji appears

1 linked foods

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Ingredient connections awaiting review · Coverage is still growing, including packaged snacks.

Name examples awaiting language review. Confirm the specific food or product.

Local names for rice koji

Names and romanised forms to recognise on menus and labels.

English

rice koji

Available names only. Languages may be spoken in other countries; a name alone does not identify every ingredient in a dish.

Rice koji nutrition & diet

Rice koji nutritional value

Reference: Rice, non-glutinous rice products, rice-koji

Per 100 g of 100 g edible portion in the named official reference form.

Calories
260kcal
Protein
5.8g
Carbs
59.2g
Fat
1.7g

Official national food-composition reference. The displayed food form is part of the estimate; cultivar, recipe, brand, processing and preparation can change values.

Fresh, dried and rehydrated rice koji have different moisture content, so measured nutrition should be compared on a matching form and basis. Formulations with added ingredients are distinct from plain inoculated rice.

Dietary compatibility

  • Vegan
    Not established
  • Vegetarian
    Not established
  • Pescatarian
    Not established
  • Keto
    Not established
  • Paleo
    Not established
  • Low-carb
    Not established
  • Halal
    Not established
  • Kosher
    Not established
What these diet assessments mean
Vegan · Not established
The available profile does not establish the full composition or processing for this dietary pattern.
Vegetarian · Not established
The available profile does not establish the full composition or processing for this dietary pattern.
Pescatarian · Not established
The available profile does not establish the full composition or processing for this dietary pattern.
Keto · Not established
A defined serving and sourced carbohydrate data are needed before assessing this dietary pattern.
Paleo · Not established
The ingredient form and processing have not been assessed against this dietary pattern.
Low-carb · Not established
A defined serving and sourced carbohydrate data are needed before assessing this dietary pattern.
Halal · Not established
Sourcing, processing and any applicable certification have not been verified. A food name alone does not establish halal status.
Kosher · Not established
Sourcing, processing and any applicable certification have not been verified. A food name alone does not establish kosher status.

For the plain ingredient · Awaiting review. Diet compatibility is not allergy suitability or halal/kosher certification. Keto and low-carb depend on the portion.

Reviewed ingredient entryIngredient reference · Preparations vary

AI-generated illustration for visual context. It does not identify a particular product or establish allergen content.

Sources & review

Nutrition reference: Standard Tables of Food Composition in Japan 2023, corrected March 2026 — 01116 ↗. Values are scaled from 100 g of the recorded edible form. Individual portions have no assumed fixed weight.

Expanded overview, name examples and nutrition notes are database drafts awaiting editorial review. Numeric nutrition values, where shown, have their own source and food-form reference.

The ingredient description and dish connections come from the draft catalogue and may change after review.

Last recorded verification: .