Jack in the Box Jr. Jumbo Jack: nutrition and allergens
The Jr. Jumbo Jack at Jack in the Box has 400 calories, 25 g fat, 31 g carbohydrate, 14 g protein and 700 mg sodium per serving (151 g), according to Jack in the Box’s nutrition information.
Nutrition facts
| Serving size | 151 g |
|---|---|
| Calories | 400 |
| Calories from fat | 230 |
| Total fat (g) | 25 32% |
| Saturated fat (g) | 6 30% |
| Trans fat (g) | 0.5 |
| Cholesterol (mg) | 30 10% |
| Sodium (mg) | 700 30% |
| Potassium (mg) | 210 4% |
| Total carbohydrate (g) | 31 11% |
| Dietary fiber (g) | 1 4% |
| Total sugars (g) | 5 |
| Protein (g) | 14 28% |
Percentages are the share of the FDA Daily Value for adults and children 4 and over, worked out from Jack in the Box’s published amounts (how % Daily Value works). A dash means Jack in the Box does not publish that value for this item. Not published for this item: added sugars.
Using the FDA’s rule of thumb that 5% of the Daily Value or less per serving is low and 20% or more is high, one serving is high in fat (32%), saturated fat (30%), sodium (30%) and protein (28%) and is low in potassium and dietary fiber. Add it up with other items in the Jack in the Box nutrition calculator.
Allergens
According to Jack in the Box, the Jr. Jumbo Jack contains milk, egg, wheat, soy and sesame.
| Milk | Contains |
|---|---|
| Egg | Contains |
| Fish | Not listed |
| Crustacean shellfish | Not listed |
| Tree nuts | Not listed |
| Peanuts | Not listed |
| Wheat | Contains |
| Soy | Contains |
| Sesame | Contains |
Buns contain sesame in some regions.
Jack in the Box kitchens handle soy, egg, fish, milk, wheat and sesame, and shared equipment means an item can pick up one of these even when its ingredients do not list it. Grilled vegetables, eggs and some bakery items are cooked with a butter-flavored vegetable oil that adds soy. The allergen guide does not cover dressings, crunchy toppings, dipping sauces or sauce packets within other items; those are listed on their own. Guests with food allergies are advised to consult their physician and to recheck the information often, since menus and ingredients change.
Other items in Burgers & More at Jack in the Box
By calories, the Jr. Jumbo Jack ranks 3 of 15 in Jack in the Box’s Burgers & More section, from lowest to highest. The table shows the 9 items nearest to it; each item is compared at its first listed size.
| Item | Calories |
|---|---|
| Hamburger | 330 |
| Cheeseburger | 370 |
| Jr. Jumbo Jack | 400 |
| Jr. Jumbo Jack Cheeseburger | 440 |
| Jr. Bacon Cheeseburger | 470 |
| Jumbo Jack | 520 |
| Jumbo Jack Cheeseburger | 600 |
| Sourdough Jack | 690 |
| Classic Smashed Jack | 720 |
Nutrition for all 15 items in Burgers & More at Jack in the Box
Browse the Jack in the Box menu by goal: high-protein items · low-calorie items
Sources
- 1 Jack in the Box, 2026 Nutrition Facts (Jack in the Box nutrition guide) Covers nutrition, allergens and menu · Printed as "effective as of November 2026" · Checked 8 Oct 2026
- 2 Jack in the Box, Allergens Reference Guide Covers allergens · Checked 8 Oct 2026
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