Keto at In-N-Out: A 2026 Comprehensive Macro Guide
If you’re on the Keto diet in 2026, you already know the drill: high fat, moderate protein, and almost zero carbs. Most fast-food places are a nightmare for Keto because everything is wrapped in bread or breaded in flour. But In-N-Out is actually a “Keto Kingdom” if you know the secret language of the menu.
To stay in ketosis, you usually need to keep your net carbs under 20–50 grams a day. Here is exactly how to hack the In-N-Out menu to keep your macros perfect.
1. The “Protein Style” Hack (The Classic)
This is the most famous way to eat Keto at In-N-Out. When you say “Protein Style,” they take away the big flour bun and wrap your burger in giant, crunchy leaves of hand-leafed lettuce.
- The Macros: A Double-Double (Protein Style) has about 8g of net carbs.
- The Trap: Most of those 8 carbs come from the In-N-Out Spread and the onions/tomatoes. If you want to go even lower, ask for “No Spread” and “No Onions.”
2. The Flying Dutchman (The “Zero Carb” King)
If you want to be a Keto pro, you order the Flying Dutchman. This is just two beef patties and two slices of cheese. No bun, no lettuce, no veggies. It’s the ultimate “meat and fat” meal.
- Calories: 380
- Protein: 27g
- Fat: 28g
- Net Carbs: 0g to 1g (depending on the cheese)
3. Watch Out for the “Spread”
The In-N-Out spread is delicious, but it’s a secret carb-killer. It’s made with mayo, ketchup, and relish. Because of the sugar in the ketchup and relish, one packet of spread has about 3 grams of carbs.
Keto Pro Tip: Swap the spread for Mustard. Mustard has zero carbs and zero calories, but it still gives the burger a huge kick of flavor. You can even ask for your burger to be “Mustard Fried,” which means they cook the mustard right into the beef.
4. The 2026 Macro Breakdown Table
Here is a quick look at how the most popular Keto orders stack up:
| Menu Item | Calories | Fat (g) | Protein (g) | Net Carbs (g) |
| Double-Double (Protein Style) | 520 | 39g | 33g | 8g |
| Cheeseburger (Protein Style) | 330 | 25g | 18g | 8g |
| Flying Dutchman | 380 | 28g | 27g | 1g |
| Large Pink Lemonade (Lite) | 10 | 0g | 0g | 2g |
5. What About the Onions?
In-N-Out is famous for its onions (fresh or grilled).
- Fresh Onions: Fine in moderation.
- Grilled Onions: These are tastier, but when onions are cooked down, the sugars become more concentrated. If you are being very strict with your macros, stick to a single slice of fresh onion or skip them entirely.
6. The “Mustard-Fried” Secret
If you miss the flavor of the “Animal Style” burger but can’t have the spread, order your burger Mustard-Fried. The cook will squirt mustard on the patty before flipping it on the grill. It creates a salty, tangy crust that tastes amazing and keeps your carbs at nearly zero.
7. Drinks: Stay Away from the Shakes
It goes without saying, but a small chocolate shake at In-N-Out has 65 grams of sugar. That will kick you out of ketosis before you even finish the cup!
Stick to:
- Unsweetened Iced Tea (0g carbs)
- Water with Lemon (0g carbs)
- Diet Coke/Coke Zero (0g carbs)
Final Verdict for 2026
In-N-Out remains one of the best places for Keto because their ingredients are fresh and they don’t use weird fillers in their meat. If you stick to Protein Style or the Flying Dutchman and swap the Spread for Mustard, you can enjoy a delicious meal without ruining your diet.
Make a better choice with in n out nutrition calculator