Tool 13/54·Calculators
Calculate net carbs for each food and track your daily keto budget to stay in ketosis.
Daily Net Carb Budget
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Enter total carbs and fiber for each food. Net carbs and your daily keto budget update in real time.
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The ketogenic diet works by restricting carbohydrates enough that your body shifts its primary fuel source from glucose to fat. When carb intake is low enough, your liver produces ketone bodies — molecules derived from fat that your brain and muscles can use for energy. Most people reach this metabolic state (ketosis) by keeping net carbs under 20–50 grams per day.
The Net Carb Formula
Net Carbs = Total Carbohydrates − Dietary Fiber
Dietary fiber is not digested by human enzymes and does not raise blood glucose. Subtracting it gives you the carbs that actually affect ketosis. For some low-carb packaged foods, certain sugar alcohols (like erythritol) can also be subtracted.
Net carbs are only one piece of the keto puzzle. A standard ketogenic macro split is roughly 70–75% fat, 20–25% protein, and 5–10% carbohydrates. Protein should be moderate — too little and you lose muscle; too much and excess amino acids can be converted to glucose through gluconeogenesis, potentially slowing ketosis. Fat is your primary fuel source and should make up the majority of your calories. Tracking all three macros alongside net carbs gives you the clearest picture.
The best keto foods combine low net carbs with high fiber, healthy fats, or complete protein. Leafy greens like spinach and kale contribute almost zero net carbs per serving. Non-starchy vegetables — cauliflower, zucchini, broccoli — are mainstays of the keto plate. Avocado stands out with just 1–2 g of net carbs per half while delivering heart-healthy monounsaturated fats. Nuts and seeds (especially pecans, macadamias, and chia seeds) provide fat and fiber. Fatty fish, eggs, cheese, and unprocessed meats have essentially zero net carbs and are unlimited on keto.
Many foods that seem healthy can still push you over your keto limit. Milk (12 g of lactose per cup), legumes (15–20 g net carbs per half cup), root vegetables like carrots and beets, and virtually all grains are too high-carb for strict keto. Sauces, salad dressings, and condiments often contain hidden sugars. Even some nuts — cashews and pistachios in particular — are significantly higher in carbs than almonds or pecans. Reading nutrition labels and using a calculator like this one helps you avoid surprises. For ongoing daily tracking, an app like Caloria can automatically parse labels and log net carbs meal by meal.
Not everyone needs the same carb limit to maintain ketosis. Strict keto (under 20 g net carbs/day) induces ketosis fastest and is often recommended for beginners or therapeutic use (e.g., epilepsy management). Standard keto (20–30 g) is the most common approach for weight loss and metabolic health, offering a bit more food variety while remaining effective. Liberal keto (up to 50 g) suits highly active individuals who can oxidize more glucose, or those cycling in and out of ketosis deliberately. Use the budget presets in this calculator to experiment and find your personal sweet spot.
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Net carbs are the carbohydrates that your body actually digests and uses for energy. You calculate them by subtracting dietary fiber (and sometimes sugar alcohols) from total carbohydrates: Net Carbs = Total Carbs − Fiber. Fiber passes through your digestive system largely undigested, so it does not raise blood sugar or trigger an insulin response the way other carbs do.
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Most standard ketogenic diets recommend staying under 20–50 grams of net carbs per day to maintain ketosis. Strict keto protocols cap net carbs at 20 g/day for the fastest ketosis results. Liberal keto allows up to 50 g/day and suits people who are physically active or transitioning from a higher-carb diet. Individual tolerance varies — some people maintain ketosis at 50 g while others need to stay below 20 g.
03
Most keto practitioners count net carbs because fiber does not spike blood glucose or kick you out of ketosis. Counting total carbs is more conservative and can be useful if you notice stalls or if you eat a lot of processed "low-carb" foods with questionable fiber sources. For whole foods like vegetables, nuts, and seeds, net carbs is the widely accepted standard.
04
Most fruit is too high in sugar for strict keto, but small portions of low-sugar berries fit well. Raspberries and blackberries have only about 3–4 g of net carbs per half cup, making them the most keto-friendly fruit choices. Avocado is also technically a fruit and is excellent on keto — a half avocado has just 1.4 g of net carbs thanks to its high fiber content. High-sugar fruits like bananas, grapes, and mangoes should be avoided.
05
It depends on the sugar alcohol. Erythritol has a negligible effect on blood sugar and is typically not counted in net carbs. Xylitol, maltitol, and sorbitol have a higher glycemic impact — subtract only half their grams from total carbs when calculating net carbs. Always check labels on keto-labeled products, as maltitol in particular can still raise blood sugar significantly.
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Yes, completely free with no account required. Add as many food items as you need, adjust your daily carb budget preset, and explore the keto food reference table — all at no cost. For automatic macro tracking across all meals and days, the Caloria app is a great next step.