Crab is one of the leanest animal proteins you can add to a healthy eating plan, but the exact fat content depends on the species you choose. This crab fat per 100g calculator gives you a quick, evidence-based estimate of total fat, saturated fat, unsaturated fat, cholesterol, and fat calories for popular crab varieties.
Just select your crab type, enter a portion weight in grams or ounces, and hit Calculate. The tool converts ounces to grams automatically and scales the per-100g nutrition data to your real serving size, which makes it ideal for macro tracking, low-fat diets, ketogenic meal planning, or simply learning more about your favorite seafood.
Whether you are logging a claw, a leg, or a whole cracked crab dinner, this calculator helps you see exactly where crab fits into your daily fat budget.
🦀 Crab Fat Estimator
Select a crab type and portion size to estimate fat content.
How to Use This Calculator
Start by choosing a crab variety from the dropdown — Alaskan king crab, blue crab, Dungeness crab, snow crab, or canned crab. Each has its own naturally occurring fat profile, so the estimate will change accordingly. Then enter your portion size in grams or ounces. If you prefer not to weigh your food, the quick preset buttons let you jump to 100 g, 150 g, 3 oz, or 5 oz with one click. The calculator converts ounces to grams automatically, applies the per-100g fat data, and returns a full breakdown of total fat, saturated fat, monounsaturated fat, polyunsaturated fat, cholesterol, and calories from fat. You can use the result directly in your macro tracker or food diary.
How the Crab Fat Data Is Determined
Seafood nutrition values like these come from laboratory analyses of raw and cooked edible muscle meat. The USDA FoodData Central database provides nutrient values for multiple crab species, and those values are what this tool uses as its baseline. For accuracy, the numbers here are expressed per 100 grams of cooked edible portion — the typical reference amount used in nutrition labeling and diet planning.
A few important details affect crab fat content. One is moisture loss during cooking: when crab is steamed, boiled, or broiled, water evaporates and the fat becomes slightly more concentrated per 100 grams than in raw crab. Another is the species. King crab tends to be somewhat richer than blue or snow crab. Canned crab generally has a low and consistent fat content because commercial packing usually selects lean meat and adds little or no oil. The numbers in this tool are rounded approximations, so they’re excellent for meal planning and conscious eating, but they aren’t a substitute for a laboratory analysis of a specific batch of crab.
Worked Examples
Example 1: Alaskan king crab, 150 g. King crab has about 1.5 g of fat per 100 g. For a 150 g serving, the calculator multiplies by 1.5: 1.5 × 1.5 = 2.25 g total fat. Saturated fat comes to 0.2 g × 1.5 = 0.3 g, and the fat provides 2.25 × 9 ≈ 20 kcal. A generous king crab leg dinner is still a low-fat meal.
Example 2: Blue crab, 3 oz (about 85 g). Blue crab has roughly 1.1 g of fat per 100 g. The calculator first converts 3 oz to 85 g, then uses 0.85 as the scaling factor: 1.1 × 0.85 ≈ 0.94 g total fat. That means even a 3 oz serving of blue crab is under 1 g of fat — ideal if you’re on a very low-fat diet.
Tips & Best Practices
- Weigh crab meat after removing the shell. Shell weight can be 40–60% of a whole crab, so factoring it out gives you a realistic edible portion.
- If you’re using this for calorie tracking, pair the fat calculation with the carbohydrate count — crab meat is naturally very low in carbs, so fat is the main macro that changes.
- Be careful with added fats. The calculator reflects plain cooked crab meat. If you’re eating crab dipped in butter, dressed with mayonnaise, or sautéed in oil, those fats need to be added separately.
- Compare crab to other animal proteins for a broader view. For example, a chicken nutrition calculator can help you benchmark lean poultry, while a lamb fat per 100g calculator shows how much higher the fat content is in red meats.
Reference Table: Approximate Fat Content by Crab Type
| Crab type (cooked, edible meat) | Total fat | Saturated fat | Monounsaturated | Polyunsaturated | Cholesterol |
|---|---|---|---|---|---|
| Alaskan king crab | 1.5 g | 0.2 g | 0.3 g | 0.6 g | 42 mg |
| Blue crab | 1.1 g | 0.2 g | 0.2 g | 0.4 g | 78 mg |
| Dungeness crab | 1.9 g | 0.3 g | 0.4 g | 0.9 g | 65 mg |
| Snow crab | 1.2 g | 0.2 g | 0.2 g | 0.5 g | 55 mg |
| Canned crab | 1.0 g | 0.2 g | 0.2 g | 0.4 g | 50 mg |
These values are rounded from USDA FoodData Central and standard nutrition references. They represent average edible meat, not crab prepared with added sauces, butter, or oils.
Frequently Asked Questions
Is crab a low-fat food?
Yes. Most crab varieties contain fewer than 2 g of total fat per 100 g of cooked meat, which is comparable to chicken breast and far lower than fatty cuts of beef or lamb. It is also a source of omega-3 polyunsaturated fats, which support heart health when eaten as part of a balanced diet.
Does cooking method change the fat content?
Steaming, boiling, and broiling crab meat without added fat do not add fat, but they do remove moisture, which can make the fat percentage seem slightly higher by weight. Cooking with butter, oil, or rich sauces adds significant fat on top of the natural crab fat. A good rule is to calculate the plain crab first and then log any added cooking fat separately.
Are the values the same for crab in sushi, crab cakes, or crab dip?
No. This calculator is for plain crab meat only. Sushi rolls include rice and other fillings, crab cakes often contain breadcrumbs and mayonnaise, and crab dip typically includes cream cheese or sour cream. The fat content in these dishes can be many times higher than plain crab. For accuracy, use this tool for the plain crab portion and your recipe builder or food diary for the rest.