How many calories is Onigiri?

1 piece (150g) of Onigiri has 251 calories.

How much protein is in Onigiri?

1 piece (150g) of Onigiri has 5 grams of protein.

How many calories are in 100g of Onigiri?

100g of Onigiri has 167 calories and 4 grams of protein.

What is a standard serving for Onigiri?

A standard serving of Onigiri is 1 piece (150g), which has 251 calories and 5 grams of protein.

How do I estimate my portion of Onigiri?

The easiest way is to estimate the main calorie drivers separately: rice ball size, nori strip, filling portion and salt crust. If you don't know how much Onigiri you ate, or whether you had a piece, serving, plate, bowl or cup, download Welling and it will help estimate the portion for you.

Onigiri

Generic

1 piece (150g) of Onigiri contains 251 calories and 5 grams of protein

Amount

Serving

Other servings:

251 calories

per 1 piece (150g)

Protein 5g

Carbs View in app

Fat View in app

Log with Welling

See the full macros for Onigiri in the Welling app.

Nutrition Facts for 1 piece (150g) of Onigiri

Nutrition per serving of Onigiri. Values other than calories and protein are available in the Welling app.
Calories	251 kcal
Protein	5g
Fat	View in app
Carbs	View in app
Fiber	View in app
Sugar	View in app
Sodium	View in app

Macro Ratio for Onigiri

See how protein, carb and fat are split for this food in the app.

View in app

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Frequently Asked Questions

How many calories is Onigiri?: 1 piece (150g) of Onigiri has 251 calories.
How much protein is in Onigiri?: 1 piece (150g) of Onigiri has 5 grams of protein.
How many calories are in 100g of Onigiri?: 100g of Onigiri has 167 calories and 4 grams of protein.
What is a standard serving for Onigiri?: A standard serving of Onigiri is 1 piece (150g), which has 251 calories and 5 grams of protein.
How do I estimate my portion of Onigiri?: The easiest way is to estimate the main calorie drivers separately: rice ball size, nori strip, filling portion and salt crust. If you don't know how much Onigiri you ate, or whether you had a piece, serving, plate, bowl or cup, download Welling and it will help estimate the portion for you.

Sources and methodology

Nutrition values are reviewed and compiled from published food composition data, the sources listed below, and Welling’s own nutrition database. Values are based on common serving sizes and may vary by portion size, ingredients, cooking method, and restaurant preparation.

References

USDA FoodData Central (opens in a new tab) US Department of Agriculture
EFSA food composition data (opens in a new tab) European Food Safety Authority
Energy and Nutrient Composition of Food (SG FoodID) (opens in a new tab) Health Promotion Board, Singapore
Nutrient Information Inquiry System (opens in a new tab) Centre for Food Safety, Hong Kong
MenuStat (opens in a new tab) Restaurant menu nutrition data, NYC Department of Health and Mental Hygiene
Welling food database Welling's own food and serving size data

Last updated: September 10, 2026