Net carbs calculator

Calculate net carbs from total carbs, fiber, and sugar alcohols, then compare the result with a typical daily keto limit.

Quick guide on when this calculator is most useful and when to recalculate your values.

Enter values

Total carbs

Fiber

Sugar alcohols

12.0 g

This is the amount of carbs that affects blood glucose.

Net carbs = total - fiber - 1/2 sugar alcohols

Compared to a limit

Typical keto limit: 20-30 g of net carbs per dayWithin

Compared to a limit

12.0 / 20 g

0 g20 g40 g

A quick overview of how the result is formed and how to apply it in practice.

Net carbs are the portion that impacts blood glucose.

Sugar alcohols are partially absorbed, so we count 50%.

Foods with similar net carbs can differ in satiety and tolerance.

Use your own response to fine-tune product choices.

Small practical steps to help you apply the result day to day.

Check labels: not all sugar alcohols behave the same.

Spread carbs across meals to stay within your limit.

Prefer whole foods when possible for simpler tracking.

Try a small portion first when testing new products.

Keep a 3-5 g buffer for label rounding variance.

Short answers to common questions about calculations and interpretation.

Why 50%?

It's a practical average for most sugar alcohols.

Can I use a different rule?

Yes, some people use 0% or 100% depending on type.

Is fiber always fully subtracted?

Usually yes, but individual tolerance to foods still varies.

Why does my app show different values?

Databases and manufacturer rounding can differ.

Do all sugar alcohols count the same?

No. Some sugar alcohols have very little effect on glucose, while others are partially absorbed. That is why the calculator uses an average 50% rule.

Formula is approximate and depends on the product.

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