Yams are a starchy root vegetable that many low-carb and keto eaters monitor carefully. While they bring fiber, potassium, and vitamin C to the plate, they also deliver a meaningful amount of carbohydrate. The Yam Net Carbs Calculator helps you work out how many digestible carbs you're actually eating by subtracting fiber (and sugar alcohols, if relevant) from total carbohydrates.
Just enter your portion size in grams, ounces, cups, or whole yams, and the tool converts it to a precise weight, applies standard USDA nutrition data for yam, and shows a clear breakdown of total carbs, fiber, and net carbs. It's ideal for anyone following keto, low-carb diets, or simply tracking daily carbs for better blood sugar management.
You can also adjust the fiber value if you're using a different yam product or label, making this tool flexible enough for recipes, meal prep, and nutrition logging.
🥔 Enter Your Yam Portion
⚙️ Optional Nutrition Values (per 100g)
Quick Start
Using the calculator takes about ten seconds. Choose the unit that matches how you measure your yam — grams, ounces, cups of cubed yam, or whole medium yams — then type in the number and hit Calculate Net Carbs. The standard food label values are already filled in, but you can change the total carbohydrate, dietary fiber, or sugar alcohol fields if your yam product has a different nutrition profile.
The result box shows the net carbs for your exact portion, followed by a step-by-step breakdown so you can see exactly how the math was done. If you frequently track the same portion, try the preset buttons — they instantly fill in 100 g, one cup, or 10 oz.
How Net Carbs Are Calculated
Net carbohydrates are the carbohydrates your body actually absorbs and converts into glucose. The common formula is:
Fiber is subtracted because most forms pass through the digestive tract largely intact and do not raise blood sugar the same way digestible starches and sugars do. Sugar alcohols (like erythritol, xylitol, or sorbitol) are subtracted only partially in most low-carb approaches; this calculator subtracts the full amount you enter into the optional field, which matches the simplest counting method. For plain yams, sugar alcohols are essentially zero, so the field stays at 0.
Nutrition values used here are based on the USDA FoodData Central entry for raw yam. Per 100 grams, raw yam contains approximately 27.9 g total carbohydrate and 4.1 g dietary fiber, giving about 23.8 g net carbs per 100 g. Because the calculator converts your serving to grams before calculating, the same per-100g values can be applied to any portion size.
Yam Nutrition Reference Table
| Portion | Weight | Total Carbs | Fiber | Net Carbs |
|---|---|---|---|---|
| 100 g (about ⅔ cup cubed) | 100 g | 27.9 g | 4.1 g | 23.8 g |
| 1 cup cubed | 150 g | 41.9 g | 6.2 g | 35.7 g |
| 1 medium yam (5″) | ~150 g | 41.9 g | 6.2 g | 35.7 g |
| 1 oz | 28.3 g | 7.9 g | 1.2 g | 6.7 g |
Weights for cups and medium yams are typical approximations. Actual weights vary with the size and cut of the yam.
Worked Examples
Example 1: 125 g of baked yam
Grams = 125 → Total carbs = 125 × (27.9 ÷ 100) = 34.9 g → Fiber = 125 × (4.1 ÷ 100) = 5.1 g → Net carbs = 34.9 − 5.1 = 29.8 g.
Example 2: 1.5 cups of cubed yam
1 cup = 150 g, so 1.5 cups = 225 g. Total carbs = 62.8 g, fiber = 9.2 g, net carbs = 53.6 g.
Tips & Common Mistakes
Weigh in grams for accuracy. Cup measurements for cut vegetables are notoriously inconsistent. If you're on a strict carb budget, a $10 kitchen scale is more reliable than a measuring cup.
Check your yam label. Canned yams in syrup, candied yams, and yam fries can have far more total carbs because of added sugars. The values in this calculator are for plain raw or cooked yam without added ingredients.
Don't confuse yams with sweet potatoes. In North American grocery stores, what's labeled 'yam' is often a moist-fleshed sweet potato. True yams are drier, starchier, and less sweet. Nutrition values can differ slightly, so check the label or the USDA database for the exact product.
Frequently Asked Questions
Is yam keto-friendly? No. With about 23.8 g net carbs per 100 g, a typical serving will consume most of a daily keto carb allowance. Even a small 50 g serving provides ~12 g net carbs.
Does cooking change net carbs? No. Cooking changes weight by changing water content, but 100 g of cooked yam has a slightly different carb concentration than raw. The calculator uses raw yam values. If you're entering a cooked portion, it's best to look up the corresponding USDA value for cooked yam and adjust the total carb field.
Are sweet potatoes and yams the same for net carbs? Sweet potatoes are similar but not identical. A 100 g serving of baked sweet potato has about 20.7 g total carbs and 3.3 g fiber, giving roughly 17.4 g net carbs — noticeably lower than yam. If you're comparing root vegetables, you can also use the turnip net carbs calculator or bean carbs calculator for other foods.
Why subtract fiber? Fiber is a carbohydrate, but it is not digested into glucose in the small intestine. Most dietary guidelines agree that fiber contributes few or no calories and does not spike blood sugar, so low-carb diets exclude it from the net-carb total.