Salad dressings can quietly derail a low-carb or keto diet. A light drizzle of ranch or balsamic vinaigrette may deliver 5–15 grams of carbohydrate per serving, and since serving sizes vary wildly between brands, comparing labels is confusing. This calculator converts any dressing's carb content to a standard per 100g value, so you can compare products and track your intake with confidence.
Enter the carbs per serving and serving size from your nutrition label, or if you make your own dressing, enter the total carbs and weight of the whole batch. The tool instantly shows carbs per 100g, plus breakdowns for typical 15g and 30g portions. It's ideal for anyone counting carbs on keto, diabetic, or general healthy-eating plans.
Use the quick-fill examples to see how common dressings compare, then enter your own label values for accurate results. Every calculation uses the same simple proportion: carbs ÷ weight × 100.
🥗 Dressing Carbs Per 100g Calculator
Convert any salad dressing label or homemade batch to carbs per 100g.
Step-by-Step Guide
Choose the Nutrition label method for packaged dressings. Find "Total Carbohydrate" and the serving size (in grams) on the label, enter both values, and the tool converts them to a standard per 100g figure. Use the Total batch / recipe method for homemade dressings: add up the carbohydrates from every ingredient, then weigh the entire finished batch.
Formula Explained
The calculation is a simple proportion. First, find the carbohydrate content per gram of dressing:
Carbs per gram = total carbs ÷ total weight
Multiply that by 100 to get the per 100g value:
Carbs per 100g = (total carbs ÷ total weight) × 100
Portion breakdowns such as 15g or 30g are then derived by multiplying the per 100g value by the portion size and dividing by 100. For example, a dressing with 10g of carbs per 100g provides 10 × 30 ÷ 100 = 3g of carbs in a 30g serving.
Worked Examples
Example 1 — Label values: A ranch dressing label states 2g of carbs per 30g serving. Per 100g = (2 ÷ 30) × 100 = 6.7g, and a modest 15g drizzle contains about 1g of carbs.
Example 2 — Homemade batch: Your honey-balsamic vinaigrette contains 8g of total carbs and weighs 240g in total. Per 100g = (8 ÷ 240) × 100 = 3.3g, so a 30g portion delivers roughly 1g of carbs.
Reference Table
Approximate carbohydrate values for common dressings per 100g. Actual numbers vary by brand, recipe, and sweetener type.
| Dressing | Carbs per 100g (approx.) |
|---|---|
| Oil & vinegar (simple) | 0–2 g |
| Blue cheese | 3–5 g |
| Caesar | 4–7 g |
| Ranch | 5–8 g |
| Italian | 7–10 g |
| Balsamic vinaigrette | 12–20 g |
| Thousand Island | 13–20 g |
| French | 16–22 g |
| Honey mustard | 20–30 g |
Pro Tips
Common Mistakes to Avoid
Frequently Asked Questions
Why do some labels list carbs per 100g and others per serving?
Label formats differ around the world. Many countries require per 100g values, while the US typically shows per-serving values. This calculator bridges the two, letting you convert any serving-based label into the per 100g standard or compare it directly with a homemade batch.
Are sugar-free dressings always low in carbs?
Not necessarily. Sugar-free dressings may still contain maltodextrin, thickeners, or dairy ingredients that add carbohydrates. Always check the total carbohydrate line rather than assuming a sugar-free claim means zero carbs.
Where can I find accurate carb data for whole foods used in homemade dressings?
The USDA FoodData Central database is an excellent free reference for ingredient-level values — see FoodData Central.