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Net carb calculator

Subtract fiber and your chosen share of sugar alcohols from a total-carbohydrate amount.

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Net carb calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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More inputs and assumptions

Answer

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Subtract fiber and your chosen share of sugar alcohols from a total-carbohydrate amount.

More results
Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
Net = total − fiber − alcohols × selected fraction. Label definitions vary, and there is no single universal net-carb method. Use a total that includes fiber and alcohols; no dietary, diabetes or insulin-dosing conclusion is provided.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using Net carb calculator
Subtract fiber and your chosen share of sugar alcohols from a total-carbohydrate amount.
Net = total − fiber − alcohols × selected fraction. Label definitions vary, and there is no single universal net-carb method. Use a total that includes fiber and alcohols; no dietary, diabetes or insulin-dosing conclusion is provided.
Next: Calories per serving calculator
A worked example
Example inputs: total carbohydrate (g) = 30, dietary fiber (g) = 5, sugar alcohols (g) = 10, sugar-alcohol percentage to subtract = 50. Net carbohydrates under chosen subtraction = 20.
Before you use the result
Net = total − fiber − alcohols × selected fraction. Label definitions vary, and there is no single universal net-carb method. Use a total that includes fiber and alcohols; no dietary, diabetes or insulin-dosing conclusion is provided.
Example results for total carbohydrate (g)
These examples use Dietary fiber (g): 5; Sugar alcohols (g): 10; Sugar-alcohol percentage to subtract: 50. They are reference calculations, not recommended settings.
Total carbohydrate (g)Net carbohydrates under chosen subtraction
155
3020
6050
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ToolOctopus. “Net carb calculator.” Updated 2026-09-26. https://tooloctopus.com/net-carb-calculator.
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