Calculadora de Carboidratos Líquidos
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
líquido = total − fibra − poliois/2
About this calculator
The Net Carbs Calculator helps you determine the amount of carbohydrates that effectively impact your blood glucose, especially useful for low-carb, ketogenic diets or diabetes management. The calculation is simple: subtract fiber and half of sugar alcohols (polyols) from total carbs. This is because fiber is not digested and polyols have reduced glycemic effect.
How to use the calculator: enter the values for total carbs, fiber, and polyols (if any) of a food or meal. The result shows net carbs, representing the portion that actually raises glucose. The formula used is: net carbs = total carbs, fiber, (polyols / 2). This is a common approach, but some experts subtract 100% of polyols; consult your nutritionist.
When to use: when planning meals for carbohydrate-restricted diets such as ketogenic, Atkins, or type 2 diabetes. Helps choose foods with low glycemic impact, like leafy greens, nuts, and sweeteners like erythritol. Avoid using for processed foods with many polyols, which may cause digestive discomfort.
Cautions: not all polyols are equal, erythritol has nearly zero impact, while maltitol significantly raises blood glucose. The calculator assumes an average; check the type of polyol on the label. Additionally, insoluble and soluble fibers have different effects; total subtraction is a simplification. Consult a healthcare professional for personalized adjustments.
Frequently asked questions
What are net carbs?
They are total carbohydrates minus fiber and half of sugar alcohols (polyols). They represent the carbs that actually affect blood glucose.
Should I subtract 100% of polyols or just half?
The calculator uses half as default because glycemic impact varies. For erythritol, you can subtract 100%; for maltitol, less. Consult your nutritionist.
Can I use this calculator for any food?
Yes, as long as you have values for total carbs, fiber, and polyols (if any). Foods without labels (like fruits) require consulting nutritional tables.
What is the difference between net carbs and total carbs?
Total carbs include all types, including fiber and polyols. Net carbs exclude fiber and part of polyols, focusing on those that raise glucose.
Is this calculator suitable for diabetics?
Yes, it is useful for blood glucose control. But consult a doctor or nutritionist to adjust the diet to your specific needs.