The Zaxbys Birthday Cake Milkshake is the sweetest of the four regular shake flavors. Here’s how many calories it has, what allergens it lists and how to check which stores serve shakes.
Quick answers
- How many calories are in the Birthday Cake Milkshake?
- 730 calories, per the official Zaxbys guide.
- What allergens does it list?
- Milk.
- How much protein does it have?
- 13 g.
What it is
Handcrafted milkshake. Not every store serves shakes; the app has a milkshake finder.
Birthday cake shake at a glance
The official guide lists 730 calories, the highest of the four regular shakes (vanilla, chocolate, strawberry and birthday cake). It lists milk. Not every restaurant serves milkshakes, and the official app has a milkshake finder. See all flavors on Zaxbys milkshakes and desserts.
Zaxbys Birthday Cake Milkshake sizes and options
There is one option listed in the official guide (Shake). The full nutrition facts are in the table below.
| Option | Calories | Protein | Sodium | Allergens |
|---|---|---|---|---|
| Shake | 730 | 13 g | 600 mg | Milk |
Full nutrition facts
| Option | Calories | Total fat | Sat. fat | Trans fat | Cholesterol | Sodium | Carbs | Fiber | Sugars | Protein |
|---|---|---|---|---|---|---|---|---|---|---|
| Shake | 730 | 19 g | 13 g | 0.5 g | 60 mg | 600 mg | 129 g | 0 g | 113 g | 13 g |
Nutrition at a glance
For the standard serving, the official guide lists:
- 730 calories, 19 g fat, 129 g carbs (113 g sugar)
- 13 g protein, or 1.8 g per 100 calories
- 600 mg sodium, about 26% of the 2,300 mg FDA daily value
That’s about 18% heavier than the typical item in this category (about 620 calories at the midpoint).
Allergens
The official guide lists milk.
Not listed: egg, wheat, soy, peanut, tree nut, shellfish, sesame and fish. Shared equipment means trace amounts of any allergen are still possible.
Want to see every item with a certain allergen? Use the allergen menu.
How it compares
Here’s Birthday Cake Milkshake next to 3 similar items, so you can see where it sits.
| Item | Calories | Options | Allergens | Example price |
|---|---|---|---|---|
| Birthday Cake Milkshake | 730 | 1 | Milk | $4.99 |
| Strawberry Milkshake | 680 | 1 | Milk | $4.99 |
| Chocolate Milkshake | 670 | 1 | Milk | $4.99 |
| Vanilla Milkshake | 570 | 1 | Milk | $5.49 |
Good to know
- Our example price is $4.99, but each Zaxbys restaurant sets its own prices, so check the official app or zaxbys.com for your store.
Frequently asked questions
How many calories are in the Zaxbys Birthday Cake Milkshake?
730 calories, per the official Zaxbys guide. That’s about 18% heavier than the typical item in this category (about 620 calories at the midpoint).
Does the Zaxbys Birthday Cake Milkshake contain milk?
Yes. The official guide lists milk.
Is the Birthday Cake Milkshake gluten-free?
The official guide doesn’t list wheat or gluten, but Zaxbys doesn’t call any item gluten-free, and fryers and prep areas are shared. See our gluten-free guide.
How much is a milkshake at Zaxbys?
Our example price is $4.99, but every Zaxbys restaurant sets its own prices, so yours may be higher or lower. The official Zaxbys app and zaxbys.com show the exact price once you pick your store.
Where this information comes from. All nutrition and allergen information on this site is taken from the official Zaxbys Nutrition & Allergen Guide (revised November 2025), published on zaxbys.com. We have not added anything of our own or changed the figures. Recipes, suppliers and menus change, so please verify with Zaxbys or your restaurant before you rely on it, especially if you have a food allergy. Verify before use.