Spinach is a nutritional powerhouse, but if you're tracking carbohydrates for keto, low-carb, or diabetic meal planning, you need precise numbers. This calculator lets you determine the total carbs, net carbs, and fiber in any amount of spinach — whether it's raw, cooked, frozen, or canned.
Simply enter the quantity and select the unit and form of spinach. The tool instantly calculates total carbohydrates, dietary fiber, and net carbs (total carbs minus fiber), which is the number most low-carb dieters track. You'll also see a breakdown per 100g and per serving, making it easy to log your intake accurately.
Whether you're a meal prepper, a keto enthusiast, or just curious about your greens, this calculator takes the guesswork out of carb counting. Use the preset buttons for common serving sizes, or enter your exact amount for full control.
🥬 Spinach Carb Calculator
📊 Results
Per 100g: —
Per serving: —
How to Use This Tool
Using the spinach carb calculator is straightforward. Start by entering the amount of spinach you plan to eat. You can type a number in the amount field and then choose the unit from the dropdown — grams, ounces, cups (raw), or cups (cooked). Next, select the form of spinach: raw, cooked (boiled), frozen (chopped), or canned (drained). The calculator uses standard USDA nutrition data for each form, so you get accurate numbers for your specific preparation.
If you're not sure how much to enter, use the quick-fill buttons for common serving sizes. For example, one cup of raw spinach is about 30 grams, while one cup of cooked spinach is about 180 grams. These presets save time and help you visualize portion sizes.
After clicking "Calculate Carbs," the results panel shows total carbohydrates, dietary fiber, and net carbs (total minus fiber). It also displays the per-100g values and the per-serving breakdown, so you can easily log your meal or compare with nutrition labels.
Why Net Carbs Matter
Net carbs are the carbohydrates that your body actually digests and absorbs. Fiber is a type of carbohydrate that passes through your system largely undigested, so it doesn't raise blood sugar the way other carbs do. For people following a ketogenic diet, a low-carb diet, or managing diabetes, tracking net carbs is often more useful than tracking total carbs.
The formula is simple: Net Carbs = Total Carbs − Fiber. For example, 100 grams of raw spinach contains about 3.6 grams of total carbs and 2.2 grams of fiber, giving you only 1.4 grams of net carbs. That's why spinach is a favorite green for low-carb eaters — you can eat a generous portion without blowing your carb budget.
Keep in mind that different forms of spinach have slightly different carb and fiber values. Cooking spinach reduces its water content, so the nutrients become more concentrated per gram. Frozen and canned spinach may also have added ingredients, so always check the label if you're using a commercial product.
Worked Examples
Example 1: Raw spinach salad
You're making a salad with 2 cups of raw spinach. One cup of raw spinach is about 30 grams, so 2 cups is 60 grams. Using the raw data (3.63 g carbs, 2.2 g fiber per 100g):
- Total carbs = 60/100 × 3.63 = 2.18 g
- Fiber = 60/100 × 2.2 = 1.32 g
- Net carbs = 2.18 − 1.32 = 0.86 g
So your salad base has less than 1 gram of net carbs — excellent for keto.
Example 2: Cooked spinach side dish
You cook 1 cup of frozen spinach (about 180 grams). Using the frozen data (4.21 g carbs, 2.2 g fiber per 100g):
- Total carbs = 180/100 × 4.21 = 7.58 g
- Fiber = 180/100 × 2.2 = 3.96 g
- Net carbs = 7.58 − 3.96 = 3.62 g
Even a full cup of cooked spinach keeps net carbs under 4 grams.
Nutritional Profile of Spinach
Spinach is not just low in carbs — it's packed with micronutrients. A 100-gram serving of raw spinach provides about 23 calories, 2.9 grams of protein, and significant amounts of vitamin K, vitamin A, folate, and iron. It's also a good source of magnesium and potassium. The high water content (about 91%) makes it very filling for very few calories.
Because spinach is so nutrient-dense, it's a staple in many healthy eating plans. Whether you're counting macros, tracking calories, or just trying to eat more vegetables, spinach is an excellent choice. The carb calculator helps you fit it into your daily targets without guesswork.
Factors Affecting Accuracy
The values used in this calculator come from the USDA FoodData Central database, which is the standard reference for nutrition information. However, actual values can vary slightly depending on the variety of spinach, growing conditions, and how it's prepared. For example, baby spinach may have slightly different moisture content than mature spinach.
When measuring cooked spinach, remember that cooking causes water loss, so the same weight of cooked spinach contains more nutrients than raw. This is why the per-100g values differ between raw and cooked forms. If you're using a packaged product, always check the nutrition label for the most accurate numbers, especially if the product has added sauces or seasonings.
For precise tracking, weigh your spinach with a kitchen scale rather than relying on volume measurements. Cups can vary based on how tightly the leaves are packed. The calculator's unit conversions are based on average values, so weighing gives you the best accuracy.
Frequently Asked Questions
Is spinach keto-friendly? Absolutely. With only about 1.4 grams of net carbs per 100 grams of raw spinach, you can eat large portions and stay well within keto carb limits. It's one of the most keto-friendly leafy greens.
Can I eat unlimited spinach on a low-carb diet? While spinach is very low in carbs, it's still possible to overdo it if you eat enormous quantities. However, for most people, even several cups a day won't interfere with carb goals. Just be mindful of any added fats or dressings that can add calories.
Does cooking spinach change its carb content? Cooking doesn't change the actual carbohydrate molecules, but it does change the weight due to water loss. So 100 grams of cooked spinach has more carbs than 100 grams of raw spinach because it's more concentrated. The calculator accounts for this by using different values for each form.
What about canned spinach? Canned spinach is typically drained and may have added salt. The carb content is similar to cooked spinach, but check the label for any added sugars or thickeners. The calculator uses a standard value for canned, drained spinach.
How do I measure net carbs for other greens? The same principle applies: total carbs minus fiber. You can use similar calculators for other vegetables, such as the avocado carb calculator or the broccoli calorie calculator, to plan your meals.
Additional Resources
For more detailed nutrition data, you can refer to the USDA FoodData Central database, which provides comprehensive nutrient profiles for thousands of foods. The American Diabetes Association also offers guidance on carb counting for diabetes management. If you're following a ketogenic diet, the Diet Doctor website has practical tips and food lists.