Costco’s Kirkland Signature Chicken Salad is a reasonable protein source but not exactly a health food. At 240 calories and 24 grams of protein per serving, it delivers solid nutrition, but the 15 grams of fat and 405 milligrams of sodium per serving add up fast, especially since most people eat more than the listed portion.
Calories, Protein, and Fat Per Serving
A single serving of Costco’s rotisserie chicken salad clocks in at about 3.5 ounces (roughly 100 grams). For that amount, you get 240 calories, 24 grams of protein, 15 grams of fat, and 6 grams of carbohydrates. The protein-to-calorie ratio is genuinely good. You’re getting a meaningful amount of protein without a huge calorie hit, which makes it competitive with other grab-and-go lunch options.
The issue is fat. At 15 grams per serving, fat accounts for more than half the total calories. About 4 grams of that is saturated fat, which represents 20% of the recommended daily limit in a single small serving. The fat comes primarily from the mayonnaise base, which is the defining ingredient in any chicken salad. If you’re watching your saturated fat intake for heart health reasons, this matters.
Sodium Is the Bigger Concern
Each 100-gram serving contains 405 milligrams of sodium. That’s roughly 18% of the 2,300-milligram daily cap recommended by the American Heart Association, and over 25% of the stricter 1,500-milligram target the AHA considers optimal for most adults. And this is before you put it on bread, crackers, or anything else that carries its own sodium.
The sodium comes from two places. The mayonnaise dressing is seasoned and salted, but the rotisserie chicken itself is also a contributor. Costco’s rotisserie chickens are injected with a brine solution containing salt, sugar, starch, spices, and sodium phosphate. That brine is what makes the chicken so flavorful and juicy, but it also means the meat starts with a higher sodium baseline than plain cooked chicken breast would.
What About the Ingredients?
Costco’s rotisserie chicken brine includes carrageenan (in the U.S.), sodium phosphate, and small amounts of sugar and starch. These sound alarming if you’re scanning an ingredient list, but they aren’t preservatives. Carrageenan is a seaweed-derived thickener used to help the brine distribute evenly through the meat. Sodium phosphate helps the chicken retain moisture during cooking. Neither is unusual in commercial rotisserie chicken, whether from Costco or any other grocery store.
The chicken salad itself adds mayonnaise (likely made with soybean or canola oil), celery, and seasonings. It’s a relatively short ingredient list compared to many packaged deli salads, which often include stabilizers, artificial flavors, or high-fructose corn syrup. The carbohydrate count of just 6 grams per serving suggests there isn’t much added sugar in the dressing.
Portion Size Is Where People Get Tripped Up
The labeled serving is 100 grams, which is roughly half a cup. That’s not a lot of food. If you’re scooping chicken salad onto a sandwich or eating it as a main course, you’re likely eating one and a half to two servings without thinking about it. At two servings, you’re looking at 480 calories, 30 grams of fat, 8 grams of saturated fat, and over 800 milligrams of sodium, all before adding bread, chips, or anything on the side.
This doesn’t make Costco chicken salad unhealthy in absolute terms. It means the nutrition label looks more favorable than what most people actually consume in a sitting. If you’re tracking macros or managing blood pressure, measuring your portion is worth the effort.
How It Compares to Making Your Own
A homemade chicken salad using plain grilled chicken breast, light mayo or Greek yogurt, and celery can cut the fat by half and drop the sodium significantly. You lose some of the richness that makes Costco’s version taste so good, but you gain control over every ingredient. Swapping full-fat mayo for a 50/50 mix of mayo and plain Greek yogurt is the simplest upgrade, adding protein while cutting saturated fat.
That said, convenience has real value. If the alternative to Costco’s chicken salad is fast food or skipping lunch entirely, the chicken salad wins. It’s high in protein, moderate in calories, and made from recognizable ingredients. It’s not a superfood, but it’s a practical, filling option that fits into most diets when you’re mindful of the serving size.
The Bottom Line on Costco Chicken Salad
Costco’s chicken salad is a mixed bag. The protein content is excellent, the calorie count is reasonable, and the ingredient list is relatively clean. The downsides are the saturated fat from mayonnaise and the sodium from both the dressing and the brined rotisserie chicken. If you eat it occasionally and stick close to the labeled serving size, it fits comfortably into a balanced diet. If you’re eating it daily or piling it on generously, the sodium and fat start to add up in ways that matter over time.