Onigiri Tuna Mayo
41
MIN WALK
200
kcal
2.1 MILES / 4,220 STEPS
Or run it off in 15 minutes.
TL;DR
One Onigiri Tuna Mayo: 200 kcal, about 41 min walking or 15 min running at 82kg reference rates.
Quantity
What is it?
Tuna mayo onigiri is a triangle of lightly salted rice filled with tuna mixed with Japanese mayonnaise and wrapped in crisp nori, kept separate by clever pull-tab packaging.
It is one of the best-selling rice balls at Japanese konbini such as 7-Eleven, FamilyMart and Lawson, grabbed on humid 27°C Tokyo and Osaka summer mornings.
The nori crackles, the rice is soft and the filling creamy and savoury. Shelves are restocked several times a day, and many commuters eat one standing on a train platform. Its mild flavour makes it a common first onigiri for visitors. A single triangle is a light but compact snack.
Frequently asked questions
How long does it take to burn off Onigiri Tuna Mayo?
At 82kg, one 200 kcal serving takes about 41 minutes walking or 15 minutes running. Your pace and body weight can change that.
Can I split the walk into shorter sessions?
Yes. Several shorter walks at a similar pace add up to the same overall walking time. Watch estimates vary across sessions.
Does the 200 kcal estimate cover every Onigiri Tuna Mayo serving?
No. The 200 kcal figure is for the serving shown here. Recipes and portion sizes can differ; check the label or restaurant information for the one you ate.
How we tested
Reference by Y.W. Fung at 82kg with an Apple Watch Ultra. The reference route is a 5.3-mile loop at 3.1 mph walking and 6 mph running; food burn minutes are calculated from calories at those rates, not individually walked off for every food. The reference test date is 2026-05-20. Check the food's listed source and serving.
In Seoul and Tokyo, where summers are usually around 27°C and humid, a longer walk in the heat can feel harder than the reference loop shown here.
Full test protocol
Burn table
| Activity | Minutes · selected quantity |
|---|---|
| Walking | 41 min |
| Running 6mph | 15 min |
| Cycling Moderate | 20 min |
| Rucking 20kg | 22 min |
Visual swap
1 Onigiri Tuna Mayo = 0.63x Pineapple Bun = 0.42x Brown Sugar Boba Milk = 0.91x Egg Tart
Base serving calorie equivalents; the quantity selector above only scales your selected total.
Nutrition facts
| Portion | Calories | Protein / Carbs / Fat |
|---|---|---|
| 100g | 182 kcal | 5.4g / 35.6g / 1.5g |
| 1 serving | 200 kcal | 5.9g / 39.2g / 1.6g |
| 2 servings | 400 kcal | 11.8g / 78.4g / 3.2g |
1 serving = 110g. Estimated from typical serving - check local label. 100g = 200 kcal x 100 / 110g. Cross-check: USDA FoodData Central.
Real-World Test
No personal tasting notes have been published for Onigiri Tuna Mayo yet. The burn estimate above uses the 200 kcal serving and the 82kg reference rates; it is not an individual eating or satiety result.
